Note: Descriptions are shown in the official language in which they were submitted.
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WATERPROOF SLIDE FASTENER
BACKGROND OF THE INVENITON
1. Field of the Invention
The present invention relates to a waterproof slide
fastener in which a slider is inserted through a pair of fastener
stringers each provided with a plurality of synthetic resin
fastener elements by integrally molding on each element
attaching edge portion of the waterproof fastener tape produced
by covering a woven or knitted belt shaped core material with
a waterproof layer.
2. Description of the Related Art
This kind of' the waterproof slide fastener has a pair of
right and left fastener tapes. Each fastener tape contains a
belt body woven or knitted with a fiber yarn or a belt-like
unwoven fabric as its core material, and both front and rear
faces of the core material are covered with a waterproof layer
composed of an elastomer. With side edge portions opposing each
other of the pair of fattener tapes serving as element attaching
edge portions, fastener elements made of synthetic resin are
integrally molded along the element attaching edge portions
such that they stride over both the front and rear faces of the
tape by injection molding, whereby fastener stringers are
formed. Further, a slider for engaging or disengaging the right
and left fastener elements is inserted through the element rows
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of the fastener stringers.
Generally, in the waterproof slide fastener, through
holes which penetrate through the front and rear faces of the
fastener tape are formed preliminarily at a molding portion for
each fastener elenient on the element attaching edge portion of
the fastener tape. When synthetic resin is molded by injection
molding to each element molding portion having the through hole,
the fastener element is formed symmetrically with the through
hole serving as a passage for synthetic resin, on both the front
and rear faces of the tape such that the fastener elements
sandwich the element attaching edge portion. Further, each
fastener element is formed such that an element upper half
portion on the tape front face side and an element lower half
portion on the rear face side are connected and integrated
through a connecting portion penetrating through the through
hole, thereby intensifying the connecting strength between the
fastener tape and the fastener element.
An example of a conventional waterproof slide fastener
having such a structure is described in Japanese Utility Model
Publication No. 63-30247 and Japanese Patent Laid-Open
Publication No. 2005-237577.
For exampleõ in the waterproof slide fastener described
in the Japanese Utility Model Publication No. 63-30247, a
waterproof layer is formed on front and rear faces of a fastener
tape, and through holes are formed in element attaching edge
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portions of the fastener tape. Upper and lower half portions
of the fastener element are formed on the front and rear faces
of the element attaching edge portion, and the upper and lower
half portions of the element are integrated through a connecting
portion penetrating through the through hole in the element
attaching edge portion. Further, in the waterproof slide
fastener of the Japanese Utility Model Publication No. 63-30247,
an adhesive agent layer is formed on both the front and rear
faces corresponding to the periphery of at least the through
holes in the fastener tape. A border portion at which the
fastener tape around the through hole makes contact with the
fastener element is closed by the adhesive agent layer, thereby
maintaining water-tightness at the border portion.
On the other hand, the Japanese Patent Laid-Open
Publication No. 2005-237577 has described a waterproof slide
fastener having a feature in the shape of a fastener element.
In one type of the waterproof slide fastener described in the
Japanese Patent Laid-Open Publication No. 2005-237577, each
fastener element includes'a coupling head, a neck portion, a
body portion and leg portions each composed of upper and lower
half portions molded integrally on the front and rear faces of
the tape, the leg portions extending to the inward of the
fastener tape from the body portion. Those half portions are
connected integrally through a connecting portion penetrating
through a through hole formed in a fastener element attaching
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portion. In each fastener element, each half portion of the
coupling head and leg portion is formed thinner in a direction
perpendicular to the front and rear faces of the fastener tape
than each half portion of the neck portion and body portion.
Further, the upper and lower half portions of the leg portion
guide upper and lower flanges of the slider through a sliding
motion, and two or more half portions are disposed at
predetermined intervals in a sliding direction of the slider.
In the waterproof slide fastener of the Japanese Patent
Laid-Open Publication No. 2005-237577 in which the fastener
element having such a shape is formed on the element attaching
edge portion, two or more upper and lower half portions of the
leg portions for guiding the slider through the sliding motion
are provided in the sliding direction, thereby reducing sliding
resistance at the time of sliding of the slider, to lead to a
smooth sliding operation of the slider. Moreover, the fastener
tape is pressed from both the front and rear faces thereof by
a mold face between half portion molding cavities for the leg
portion when the injection molding of the fastener elements is
carried out. For this reason, no swing occurs in the fastener
tape during molding, so that each leg portion is integrated by
fusion strongly to both the front and rear faces of the fastener
tape. Consequently, there occurs an advantage that fixing
strength of the fastener element to the fastener tape is
increased.
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According to the Japanese Utility Model Publication No.
63-30247 and Japanese Patent Laid-Open Publication No.
2005-237577, the fastener tape of the waterproof slide fastener
uses a belt-like body woven or knitted with a fiber yarn as its
core material, both the front and rear faces of the belt shaped
core material are covered with a waterproof layer, and an
elastomer composed of natural rubber, synthetic rubber or the
like is used as the waterproof layer. However, these Japanese
Utility Model Publication No. 63-30247 and Japanese Patent
Laid-Open Publication No. 2005-237577 describe materials
applicable as the waterproof layer roughly, and most waterproof
slide fastener currently marketed is generally composed of a
thermoplastic polyester elastomer (specifically, Hytrel
(registered trademark)) excellent in strength, durability,
molding processa'bility and the like as the waterproof layer.
Polybutylene terephthalate having excellent adhesion to the
Hytrel (registered trademark) and strength is used as a material
of the fastener element to be formed on the fastener tape.
On the other hand, in recent years, application of the
waterproof slide fastener has been expanding and
correspondingly, an object on which the waterproof slide
fastener is attached has been diversified, so that the
waterproof slide fastener has been demanded to be improved in
its adhesion characteristic to the attachment object. However,
although the thermoplastic polyester elastomer for covering the
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fastener tape is excellent in strength and molding
processability, its adhesion characteristic to the attachment
object composed of'polyurethane base is poor. For this reason,
a fastener tape having a waterproof layer composed of a
thermoplastic polyester elastomer cannot be bonded to a
polyurethane base material or polyurethane coated material
easily. In particular, when an attempt is made to attach a
waterproof slide fastener having the waterproof layer formed
of a polyester elastomer to an attachment object composed of
polyurethane base, high frequency fusion which is ordinarily
used cannot be adopted, and instead, sewing or adhesive agent
is needed, so that work requiring time and labor is necessary.
Further, a polyester elastomer is poor in plasticity as
an elastomer. Thus, a fastener tape covered with a polyester
elastomer tends to be relatively hard, so that flexibility at
the time of bendinq the tape into a U shape or twisting it through
its front and rear faces is low. Therefore, when a waterproof
slide fastener in which its waterproof layer is formed of a
polyester elastomer is attached to an attachment object such
as a wet suit, ari attachment portion of the waterproof slide
fastener becomes hard. As a consequence, a user feels it
difficult to wear or put out the attachment object, and wear
comfort when he/she wears it may lower.
In the meantime, in order to improve the adhesion
characteristic to the attachment object of polyurethane base,
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it can be considered to use a polyurethane elastomer which is
easier to bond to the polyurethane base attachment object than
the polyester elastomer, and which is more plastic as a
waterproof layer to be formed on the fastener tape. However,
if the waterproof layer of the fastener tape is just formed of
a polyurethane elstomer, the adhesion characteristic to
fastener elements of polybutylene terephthalate drops largely.
Thus, even if each fastener element is formed on the
fastener tape by connecting the upper and lower half portions
integrally through the connecting portion penetrating through
the through hole in the element attaching edge portion, fixing
strength between the fastener tape and the fastener element
necessarily drops. This possibly lowers the engaging strength
and water tightness of the waterproof slide fastener. Further,
the fastener element may rotate around the connecting portion,
so that right and left element rows cannot be engaged with each
other properly.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been achieved in
views of the above-described problems, and an object of the
invention is to provide a waterproof slide fastener in which
its fastener tape has an excellent adhesion characteristic to
an attachment object such as the one covered with urethane
coating, an excellent bending characteristic, and a high fixing
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strength between the fastener tape and a fastener element, the
waterproof slide f'astener further having an excellent engaging
strength and water-tightness.
To achieve the above-described object, the waterproof
slide fastener of the present invention is a waterproof slide
fastener having a waterproof structure, being characterized by
comprising: a pair of fastener stringers in which a plurality
of fastener elements are arranged in line by molding integrally
along opposing element attaching edge portions of a pair of
waterproof fastener tapes, in which a belt shaped core material
composed of a woven fabric, knitted fabric or unwoven fabric
is covered with a waterproof layer; and a slider for engaging
and disengaging the fastener elements; wherein the waterproof
layer is composed. of a polyurethane elastomer, and the fastener
elements are composed of a polymer alloy of polyurethane resin
and ABS resin.
Preferably, a ratio between the polyurethane resin and
the ABS resin (polyurethane resin/ABS resin) in the polymer
alloy is 20/80 to 50/50 in terms of a weight ratio.
In the fastener tape of the waterproof slide fastener of
the invention, the belt shaped core material is covered with
the waterproof layer composed of a polyurethane elastomer, and
a plurality of fastener elements of a polymer alloy of
polyurethane resin and ABS resin are attached and molded
integrally on the fastener tape.
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The inventors of the present invention have considered
use of a polyurethane elastomer as a material of the waterproof
layer instead of a conventionally generally used polyester
elastomer (for example, Hytrel) in order to intensify an
adhesion characteristic of the fastener tape having its
waterproof layer covered thereon to an attachment object such
as the one covered with urethane coating. However, if the
waterproof layer:is formed of a polyurethane elastomer, there
is a problem that an adhesion characteristic to fastener
elements of polybutylene terephthalate is lowered as described
above. Then, the inventors accumulated experiments and
considerations for using new synthetic resin indicating an
excellent adhesion characteristic having a good affinity to the
polyurethane elastomer instead of the conventionally general
polybutylene terephthalate.
First, the inventors considered using polyurethane resin
independently taking into account the affinity and adhesion
characteristics to the polyurethane elastomer of the waterproof
layer as a material of the fastener element. However, although
the adhesion characteristic to the polyurethane elastomer is
improved if the fastener elements are formed of only
polyurethane resin, it takes a long time for resin to be cooled
and hardened when the fastener elements are molded, so that a
gate is difficult to cut out, thereby presenting poor
moldability. Further, it is apparent that the fastener element
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formed of polyurethane resin is lack of practicality because
it is very soft and short of stiffness as the element. It can
be considered to use ABS resin or polycarbonate resin as well
as polyurethane resin as the material of the fastener element.
However, if any one of these resin materials is used
independently, it is difficult to obtain the strength of an
element and chemical resistance of the element is poor.
Next, to solve the aforementioned inconvenience in case
of using polyuret:hane resin for the material of the fastener
element, further experiments and considerations were
accumulated about the material. As a result, it has been found
that because the ABS resin has a good affinity with polyurethane
resin and excellent moldability, use of a polymer alloy of
polyurethane resin and ABS resin as the material of the fastener
element improves apparently the moldability of the fastener
element and intensifies the stiffness of the fastener element,
thereby reaching completeness of the present invention.
That is, if the waterproof layer to be formed in the
fastener tape is made of a polyurethane elastomer and the
fastener element to be molded integrally on the fastener tape
is a waterproof slide fastener composed of a polymer alloy of
polyurethane resin and ABS resin, the properties of the
respective materials can be exerted. Consequently, the
fastener tape has an excellent adhesive characteristic to an
attachment object such as the one covered with urethane coating
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and an excellent abrasion resistance. Further, the
moldability and stiffness of the fastener element are excellent
and fixing strength between the fastener tape and the fastener
element is raised..
Thus, the waterproof slide fastener of the present
invention has an excellent adhesive characteristic to an
attachment object made of polyurethane base synthetic resin
because it is easy to be molded and the surface of the fastener
tape is covered with a polyurethane elastomer. Thus, the
waterproof slide fastener is preferably applicable to the
attachment object composed of polyurethane base. The
waterproof slide fastener of the present invention is excellent
in flexibility, abrasion resistance, engaging strength and
water-tightness of its tape.
Furthermore, the inventors also considered the ratio
between the polyurethane resin and the ABS resin in the polymer
alloy which constitutes the fastener element in order to improve
the function of the waterproof slide fastener. As a result,
when the ratio between the polyurethane resin and the ABS resin
(polyurethane resin/ABS resin) in the waterproof slide fastener
of the invention :is 20/80 to 50/50 in terms of weight ratio,
the moldability, strength and stiffness of the fastener element
are further improved. Accordingly, the waterproof slide
fastener of the .invention excels in the traverse pulling
resistance and the like, thereby securing high quality. The
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effects which the present invention exerts are considerably
great.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of major portions mainly showing
an engaging portion of the slide fastener of the present
invention;
FIG. 2 is an enlarged plan view showing one of fastener
elements possessed by the slide fastener;
FIG. 3 is a sectional view taken along the line III-III
in FIG. 1;
FIG. 4 is a graph showing a measurement result of traverse
pulling resistance;
FIG. 5 is a graph showing a measurement result of push-up
resistance;
FIG. 6 is a graph showing a measurement result of pulling
resistance; and
FIG. 7 is a graph showing a measurement result of sliding
resistance.
DESCRIP7.'ION OF THE PREFERRED EMBODIMENTS
Hereinafter, a preferred embodiment of the present
invention will be described in detail with reference to the
accompanying drawings. In the meantime, the present invention
is not restricted to the embodiment described below, but may
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be modified in various ways as long as a modification has
substantially the same structure and exerts the same operating
effect. For example, the shape, dimension and the like of a
fastener element are not restricted to the embodiment described
below, but may be changed appropriately as required.
FIG. 1 is a plan view showing part of a waterproof slide
fastener of the embodiment, and FIG. 2 is an enlargement plan
view showing one of fastener elements possessed by the slide
fastener. FIG. :3 is a sectional view taken along the line
III-III in FIG. 1.
The waterproof slide fastener 1 of the embodiment
comprises fastener stringers 2, a slider (not shown) made of
synthetic resin or metal, a top end stop (not shown), and a
separable bottom end stop (not shown). In the fastener
stringers 2, a plurality of fastener elements 21 are molded
integrally with an engaging interval to each mating fastener
element 21 along an element attaching edge portion 11 disposed
on a side edge portion of a fastener tape 10 having waterproof
property. The slider (not shown) engages and/or disengages
right and left fastener elements 21.
In the fastener tape 10, the entire front and rear faces
of a belt shaped core material 12 made of a fiber yarn woven
fabric, knitted fabric or unwoven fabric are covered with a
waterproof layer 13 made of a polyurethane elastomer. Because
the fastener tape 10 is covered with a polyurethane elastomer,
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waterproof property can be secured and the fastener tape can
be easily attached to an attachment object made of polyurethane
base or covered with urethane coating by means of high frequency
fusion. Further, the fastener tape itself becomes more
flexible than a fastener tape covered with, for example, a
polyester elastomer, thereby obtaining an excellent bending
property. In each element molding portion of the element
attaching edge po:rtion 11 of the fastener tape 10, a through
hole 14 is formed, which is large enough for raw material resin
of the fastener element 21 in a melting state to pass
therethrough.
The aforementioned fastener element 21 is comprised of
a coupling head 22 having an oval circle shape, a substantially
hexagonal body portion 24 continuous with the coupling head 22
through a neck portion 23, a wing-like shoulder portions 25
extending on the right and left sides between the neck portion
23 and the body portion 24, and leg portions 27 extending
downward while branched to two sections via a crotch portion
26 from the lower end of the body portion 24. The fastener
element 21 having such a structure has upper and lower half
portions across the element attaching edge portion 11 of the
fastener tape 10, and these upper and lower half portions are
connected integrally with each other through a connecting
portion 28 formed in the through hole 14.
Respective half portion 22a, 22b; 23a, 23b; 24a, 24b; 25a,
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25b; and 27a, 27b of the coupling head 22, neck portion 23, body
portion 24, shoulder portion 25 and leg portions 27 are molded
integrally in a symmetrical shape on the front and rear faces
of the fastener tape 10 across the tape 10. Here, the respective
half portion 23a, 23b; 24a, 24b; 25a, 25b; and 27a, 27b excluding
the coupling head 22 are integrated with both the front and rear
faces of the fastener tape 10 by fusion.
The half portions 22a, 22b of the coupling head 22 molded
symmetrically above and below across the fastener tape 10 extend
in parallel outward of an end edge lla with the end edge lla
of the element attaching edge portion 11 of the fastener tape
exposed slightly outward. The exposure length L1 of the end
edge lla of the element attaching edge portion 11 extending from
the shoulder portion 25 is set to a dimension in which the
exposing end face of the end edge lla makes a pressure contact
with the exposing end face of a mating fastener tape 10 when
the coupling head 22 engages a mating coupling head 22. Thus,
the opposing end faces of the fastener tapes 10 make a pressure
contact with each other in a coupled state so as to exert
waterproof performance.
On the other hand, the respective half portions 23a, 23b;
24a, 24b; 25a, 25b; and 27a, 27b of the neck portion 23, the
body portion 24, the shoulder portion 25 and the leg portions
27 are fixed firmly to the element attaching edge portion 11
of the fastener tape 10. Of them, the thickness of the
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respective half portions 23a, 23b; and 24a, 24b of the neck
portion 23 and the body portion 24 is the largest, and the
thickness of the:respective half portions 25a, 25b; and 27a,
27b of the shoulder portion 25 and the leg portion 27 is set
to approximately 1/3 the thickness of the respective half
portions 23a, 23b; and 24a, 24b of the neck portion 23 and the
body portion 24.
The outside surface of the half portions 22a, 22b of the
coupling head 22 is located on an identical plane to the outside
surfaces of the respective half portions 23a, 23b; and 24a, 24b
of the neck portion 23 and the body portion 24. Due to such
a structure, when the fastener elements 21 engage each other,
the half portions 25a, 25b of each shoulder portion 25 of the
fastener elements 21 adjacent to the right and left sides make
contact with an inside face of the half portions 22a, 22b of
the coupling head 22 of the fastener element 21 on one side,
as shown in FIGS. 1 and 3.
In the waterproof slide fastener 1 of this embodiment,
the fastener element 21 having the aforementioned structure is
formed of a polymer alloy of polyurethane resin and ABS resin.
The fastener element 21 made of such a polymer alloy can
intensify fixing strength to the fastener tape 10 in which
waterproof layer 13 of a polyurethane elastomer has been formed
because the polyurethane resin is made complex. In addition,
because the ABS resin is also made complex, moldability and
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stiffness of the fastener element 21 can be improved. In the
meantime, the polyurethane resin for use in the polymer alloy
is thermoplastic resin, which is different from the
polyurethane elastomer of the waterproof layer 13 to be formed
in the fastener tape 10, but harder than the elastomer and not
stretchable as easily as the elastomer.
In particularly, the fastener element 21 is configured
such that the ratio between the polyurethane resin and the ABS
resin in the polymer alloy (polyurethane resin/ABS resin) is
20/80 to 50/50 in terms of weight ratio. If the weight ratio
of the polyurethane resin is lower than 20%, no sufficient
fixing strength to the fastener tape can be obtained, and the
fastener element 21 can be cracked easily due to shortage of
the strength. As a result, the engaging strength of the slide
fastener 1 can drop. On the other hand, if the weight ratio
of the ABS resin is lower than 50%, the moldability and stiffness
of the fastener element 21 become insufficient, thereby
possibly inducing drop of the engaging strength of the slide
fastener 1.
The slide fastener 1 of the embodiment having the
above-described structure can be manufactured according to a
conventionally used method. That is, molds having a cavity of
a predetermined shape are prepared, and then, the fastener tape
covered with a polyurethane elastomer is held by its upper
mold and lower mold.
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Next, polyurethane resin chips and ABS resin chips are
mixed together at, each predetermined weight and fused. The
fused resin mater=ial is introduced into the cavities of the
molds via a sprue, runner and gate. The fused resin introduced
into the cavity passes through the through hole 14 in the
fastener tape 10, and consequently, the upper and lower half
portions of the fastener element 21 are formed symmetrically
on both the front and rear faces of the element attaching edge
portion 11 and the upper and lower half portions thereof are
connected and molded integrally through the connecting portion
28 formed in the through hole 14. As a consequence, the
waterproof slide fastener 1 of this embodiment as shown in FIGS.
1 to 3 is obtained.
In the waterproof slide fastener 1 of this embodiment
having the above-described structure, the fastener tape 10 has
an excellent adhesion characteristic to an attachment object
such as the one covered with urethane coating and excellent
abrasion resistance, and further,the moldability andstiffness
of the fastener element are excellent. Further, the fixing
strength between the fastener tape and the fastener element is
high. The waterproof slide fastener is easy to be molded, and
the flexibility, engaging strength and water-tightness of the
tape are excellent.
Examples
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Hereinafter, examples of the present invention will be
described in detail.
In the examples, five kinds of waterproof slide fasteners
having different rnixing ratios between polyurethane resin and
ABS resin in a polymer alloy constituting fastener elements were
manufactured, and the following evaluation was carried out
about each slide fastener. As the five kinds of the waterproof
slide fasteners to be evaluated, waterproof slide fasteners
whose ratios between polyurethane resin and ABS resin were
respectively 20/80 (Example 1), 30/70 (Example 2), 50/50
(Example 3) and 70/30 (Example 4) in terms of weight ratio were
manufactured, and at the same time, a waterproof slide fastener
(polyurethane resin/ABS resin = 0/100) whose fastener elements
were composed of only ABS resin without mixture of polyurethane
resin was manufactured (Comparative Example).
Next, the obtained five kinds of the waterproof slide
fasteners were evaluated about four items of traverse pulling
resistance, push-up resistance, pulling resistance and sliding
resistance. The traverse pulling resistance here indicates
the magnitude of resistance generated when, with the waterproof
slide fastener engaged, right and left fastener tapes are pulled
at a constant speed in opposite directions to the right and left .
The push-up resistance indicates the magnitude of resistance
when, with the waterproof slide fastener engaged, the fastener
elements are pushed up in a perpendicular direction to the tape
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face .
The pulling resistance indicates the magnitude of
resistance generated when any one of the fastener elements is
pulled outwardly in a tape width direction with a fastener tape
fixed in the state of a fastener stringer. The sliding
resistance indicates the magnitude of resistance generated when
any one of the fastener elements is pulled in a tape length
direction. Each magnitude of resistance is a value at the time
when the engagement of the slide fastener is released and when
the fastener element is broken down or dropped off from the
fastener tape.
In each evaluation of the resistance above, 20 specimens
were prepared for each of Examples 1 to 4 and Comparative Example,
and resistance test was carried out about five specimens for
each of the evaluation items. By averaging measurement values
obtained from the five specimens, the resistance of each
waterproof slide fastener was evaluated. FIGS. 4 to 7 show
results of the traverse pulling resistance, push-up resistance,
pulling resistance and sliding resistance obtained about the
respective waterproof slide fasteners of Examples 1 to 4 and
Comparative Example. For reference, values of the traverse
pulling resistance, push-up resistance, pulling resistance and
sliding resistance of a conventional waterproof slide fastener
in which fastener elements are molded on a fastener tape covered
with Hytrel (registered trademark) by injection molding of
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polybutylene terephthalate are indicated in each graph of FIGS.
4 to 7.
As shown in FIGS. 4 to 7, the waterproof slide fastener
(polyurethane resin/ABS resin = 30/70) of Example 2 presents
the highest value in any resistance test, indicating that it
is a high quality waterproof slide fastener. The waterproof
slide fastener of Example 1 and the waterproof slide fastener
of Example 3 indicate slightly low values in pulling resistance
and push-up resistance, respectively. However, the traverse
pulling resistance which is an important factor for the slide
fastener indicates a higher value than that of the conventional
waterproof slide fastener, thereby indicating that they are
waterproof slide fasteners having excellent engaging strength
and high quality.
Although the waterproof slide fastener of Example 4
indicated a value substantially equal to that of the
conventional waterproof slide fastener in association with the
pulling resistance and sliding resistance, it indicated a
slightly lower value than those of Examples 1 to 3 as the traverse
pulling resistance. On the other hand, the waterproof slide
fastener of Comparative Example was inferior to the slide
fasteners of Examples 1 to 4 in the traverse pulling resistance
and pulling resistance.
Further, fusion of each of the waterproof slide fasteners
of Examples 1 to 4 to an attachment object covered with urethane
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coating was checked, and consequently, they could be fused
without any problem.
As described above, it has been verified that in the
waterproof slide fasteners of Examples 1 to 4, their fastener
tapes are easy to bond to the attachment object composed of
polyurethane base and plastic, so that the moldability and
stiffness of the fastener elements are excellent.
Specifically, Examples 1 to 3 indicate high quality waterproof
slide fasteners having excellent traverse pulling resistance,
pulling resistance and sliding resistance. In the meantime,
a method of using, for example, an absorption ratio of infrared
absorption spectrum is available for investigating a ratio
between polyurethane resin and ABS resin in terms of weight
ratio in the aforementioned polymer alloy. This is a
measurement method of investigating the ratio by measuring an
amount of absorption because the absorption wavelength differs
depending on a difference in composition.
The present invention is particularly applied to a
waterproof slide fastener demanded for an excellent adhesion
characteristic to an attachment object of polyurethane base
effectively.
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