Note: Descriptions are shown in the official language in which they were submitted.
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This invention relates to an adhesively joined insulated glazing unit and
frame member for use in the glazing unit.
Insulating glazing units are known in which glass panes are held by means
of adhesive in desired relation to a separator frame defining a dead air space
between the panes and in which a channel around the periphery of the assembly
is filled with a sealant material. German Laid Open Application DT-AS 23 45
169 shows such an insulating assembly which is cons~ructed by applying a
pressure sensitive adhesive to attaching surfaces of a separator frame so that
the frame is held in position when it is laid down on one pane and a second
pane is pressed down on the frame. The peripheral channel between the frame
and portions of the panes extending beyond the frame may be filled with sealant
material without displacing the separator frame.
While the above structure offers advantages in ease of assembly, the
pressure sensitive adhesive tends to hold the frame out of contact with the
surfaces of the glass panes and both the pressure sensitive adhesive and the
sealant tend to intrude between the frame member and the glass panes to pry
them apart because of the area of frame member adjacent the pane surfaces.
It is an object of the present invention to provide a double pane insulated
glazing unit and frame member for use in that unit in which a novel disposition
of adhesive and the relation of the separator frame to the pane surfaces cooperate
to give a more impermeable barrier around the dead air space between the
panes.
To this end and in accordance with a feature of the present invention,
the members making up the separator frame of the insulating gla~ing unit have
a cross-section including side portions for direct engagement with the surfaces
of the panes and surface portions sloping away from the surfaces of the panes
to form, with the panes, recesses for adhesive on the interior, dead air space,
side of the frame members material. Sealing material fills the peripheral channel
defined by the outer side of the separator frame and portions of the pane surfaces
projecting beyond the separator frame. ~
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According to ano-ther broad aspect of -the present
invention there is provided a double glazing uni-t comprising
separator frame members surrounding a dead air insulating
space between panes o~ glass. The frame members are loca-ted
inwardly of the edges of the panes to form a channel defined
by outer faces o~ the frame members and the surfaces of the
panes from the ~rame members to the edges of -the panes, and a
sealing substance is disposed to fill the channel. The im-
provement resides in tha-t the frame members have a cross-
sec-tion providing central side portions in direct engagement
with the surfaces of the panes to minimize or eliminate any -
passage for air and moisture to or from the dead space and
surfaces sloping away from the panes to form~ with the panes,
recesses open -to the dead air space inwardly of the cen-tral
por-tions. Adhesive is disposed substantially to ~ill the
recesses inwardly of the central portions and to adhere to the
surfaces of the panes and to the surfaces of the frame
members, -
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Reference is made to the attached drawings forming a part of the disclosure
of the present application in which:
Figure 1 is a plan view with parts broken away showing the general
assembly of glass panes and separator frame; and
Figure 2 is a sectional view on an enlarged scale taken on the line II-
II of Figure 1 showing the relation of the separator frame, the adhesive and -~
the sealing material in an insulating glazing unit according to the present
invention.
An insulating glazing unit in accordance with the present invention includes
10 panes of glass lO and 12 held in spaced relation by a special separator frame14, which may be of metal or other conventional materlal, and a novel disposition
of adhesive 16 and sealing material 18 providing substantially continuous directcontact of central side portions 20 of the frame 14 with the panes 10 and 12
- to give minimum water vapor permeability between the atmosphere and the
dead air space 22 enclosed between the frame and panes. The special separator
frame 14, in addition to having exterior dimensions to leave a peripheral channel
defined by the outermost portions 24 of the frame members 14 and the inner
faces 26 and 28 of the panes 10 and 12 extending beyond the frame 14, also
provides surface portions 30 sloping away from the surfaces 26 and 28 of the
panes inwardly of the central pane-engaging side portions 20 to form mward
recesses 32 open to the dead air space 22, and other surface portions 34 sloping
away from the surfaces 26 and 28 of panes to form recesses 36 outwardly of
`~ the side pane-engaging portions 20 of the frame member 14. The adhesive
16 is composed of a shape retaining, preferably pressure sensitive adhesive
composition and disposed in the inward recesses 32, and sealing material
18 is disposed substantially to fill the outward recesses 36 and peripheral
' channel. -
In a preferred form of separator frame 14, the frame members have a
cross-section such that the central, pane-engaging side portions 20 make line
30 contact when assembled with the panes 10 and 12. Thus in the separator
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cross-section shown in Figure 2, rounded portions of the separator frame at
each side can contact the two panes only along the line of tangency with the
curved portions. Linear contact insures that the area of engagement between
the ~rame member and the glass is very small so that pressure between the
frame member and the panes is very high per unit area. I'his is a particular
advantage since it forms a tight metal to glass joint which allows minimum or
no clearance for passage of air or moisture to or from the dead air space 22.
The high pressure resists displacement of the panes 10 and 12 away from the
frame 14 by preventing undesired intrusion of sealant or adhesive between
the separator frame 14 and the panes 10 and 12 such as might occur if the pane-
engaging surfaces of the separator frame were flat areas of substantial dimensions.
The frame member 14 also is preferably provided with a filler section 38 integral
with the portion for extension outwardly into the channel to reduce the quantity~ of sealing substance 18 required to fill the channel. In the form shown, the
: filler section has side portions 40 providing relatively narrow spaces from
the inner surfaces 26 and 28 of the panes in the channel area and an end portion -
42 which is within the sealing substance 18 in the channel. This insures a
maximum path in the sealing substance from the lines of tangency to the free
surface of the sealing substance.
Deposition of shape retaining pressure sensitive adhesive on the inward
surface portions 30 of the frarne members is carried out in a way to form a
profile such that the free surfaces of the adhesive 16 carried on the inward -
surface 30 portions are substantially parallel. This enables the frame members
14 to be laid down on and adhered to a first pane member 12 in a manner which
both resists lateral displacement, prevents rotational movement of the frame
members 14 about their longitudinal axes and avoids any difficulty of overflow
of adhesive from the inward recesses 32.
The adhesive may be applied to the separator frame members in molten
condition by means of a known wheel type applicator. The adhesive is brought
to a pasty condition so that it retains the profile imparted to it by the wheel
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applicator, and it sets immediately in that shape retaining profile as heat is withdrawn
from it by the separator frame.
The insulating glazing unit assembly can be completed by simply laying ;
down the second pane 10 and applying a sealing substance 18 to the channel
between the Erame members 14 and the portions of the panes 10 and 12 beyond
the lines of contact 20 with the separator frame member 14. Any sealing substance
capable of introduction into the channel and setting to shape retaining condition
may be used. Thus there may be used sealing substances which set by chemical
action such as the polysulfide polymer sealing substances or thermoplastic sealing
substances such as those based on mixtures of natural or synthetic rubbers and/or
resins
The following examples are given to aid in understanding the invention
but it is to be understood that the invention is not restricted to the particular
shape of separator frame member nor to the particular adhesive or sealing materials :
used, nor to particular temperatures or other details of the examples.
Example 1
~ n adhesive composition was prepared having the following formula~
Percent bv Wei~ht
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! Thermoplastic styrene-butadiene-styrene block copolymer
synthetic rubber 10%
Thermoplastic styrene-isoprene-styrene block copolymer
synthetic rubber 31%
Hydrogenated mixed polyolefin hydrocarbon resin
melting point 100C (Escorez) 40%
Naphthenic oil 5%
Polystyrene, softening point 78 C, ~elt Index 9.0 8%
El:hylene Acrylic Copolyme:r
melting point 108C. Specific gravity 0.935%
UV stabilizer o 5%
Oxidation stabilizer ().5%
This composition is melted and applied to separator frame members l4 on the :
30 surfaces 30 which will be sloping away from the contact line 20 internally to
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form profiled adhesive strips on opposed surfaces of the separator strip with
their surfaces substantially parallel. The hot melt applied adhesive sets immediately
on application to the separator frame so that the applied adhesive retained its .
shape. Separator frame members are laid down on a horizontal pane 12 to form
a separator frame 14 and thereafter a second pane 10 is laid down on the frame
14 so that, under the pressure of the second pane, the pressure sensitive adhesive
16 adheres to the panes 10 and 12 to hold them in firm assembled relation. The
outer channels between the separator frame members 14 and the surfaces 26 and
23 of the panes 10 and 12 are completely sealed with sealing material which enters -
10 the recesses 36 between the surfaces 34 sloping away from the panes 10 and 12
outside of the line of contact 20. The sealant used had the following composition: ;
Polysulphide. ~qixing ratio parts A: B = 10:1 ~
~; Parts by Weight :
. Part A. Liquid Polysulphide 30
Liquid Chlorinated Paraffin 9 :
Calcium Carbonate 20
Barium Sulphate 35
Part B. Manganese Dioxide 37 ..
Lead Dioxide 7
Dioctylphthalate 53
Sulphur 3
The resulting joints provide superior resistance to passage of gas or vapors ;~
20 to or from the dead air space 22 because the line contact of the separator members
14 with the panes minimized or eliminates any possible passage for air or moisture
to or from the dead air space 22 while the length of passage through the sealing
material from the line of contact to the free surface of the sealing material is large
and imposes a substantial barrier to passage of volatile or gaseous materials
which may pass any narrow gaps in the line contact 20 between the separator
frame 14 and the panes 10 and 12.
Example 2
The procedure of Example :L was repeated and an insulated glazing unit ... ..
similar to that of Example 1 was prepared except that the pressure sensitive ~ :
. 30 adhesive used has the following composition: .
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1 ercent by ~eight
Thermoplastic styrene/butadiene/styrene hlock
copolymer synthetic rubber 17.2%
Therrnoplast;c styrene/isoprene/styrelle hlock
copolymer synthetic rubber 17.2
Hydrogenated mixed polyolefin hydrocarbon resin
melting point 100 C. (Escorez 5300) 2B.9%
Colophonium 2B . 9%
Naphthenic oil 3 . 5%
Polystyrene 2. 6ci
UV stabilizer 0.4c.
. _ 10 The sealant applied had the following composition:
Parts by ~Vei~ht ~:
P,utyl Rubber 34
Polyolefin Resin (Escorez 5300) 30
Methylabietate 5 -~ .
Colloidal ~ilica 20
Carbon Black l 1
The sealant was applied in heat soitened condition and ~:et up plomptly.
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