Note: Descriptions are shown in the official language in which they were submitted.
1 31 2~82 08CU-04219
TERNARY POLYMER B~ENDS CONTAIMING A PO~TH~ M~
A POLYPHTHALATE CARBONATE, AND RUBBER MODIF~D
VINYL AROMATlC POLYMER
~ACI:CRODU D OF ~1l e IIIVEIITlO~I
This invention is directed to molding compositions
comprising ternary blends of a polyetherimide, a
polyphthalate carbonate and rubber modified vinyl
aromatic polymer.
tO Polyetherimides resins are well known in the art and
are of considerable commercial value for use in molding
compositions because of their excellent physical,
chemical and thermal properties. The high ~lass
transition and heat deflection temperatures exhibited by
these polymers permit their use in high performance
applications previously reserved for metals and some
thermoset resins. While polyetherimide are known to
possess a number of excellent proper~ies, or many
applications, it would be desirable to have a resin with
improved flexural properties, yet which maintains the
toughnes~ and other advantageous physical properties of
polyetherimides.
It is known that the flexural properties of
polyetherimides can be improved by forming blends o
those polymers with a rubber modified vinyl aromatic
polymer. See, Glles et al., U.S. Patent 4,393,168
Although such blends maintain many of the physical
properties of polyetherimides, they have not been found
to have the toughness or impact strengths characteristic
of polyetherimides.
~,~
I~,,,, :,
~ .. .
- . .. .: . -. - ~: .
. ~ . ., .. , , ,, . ., . -
,~ - .. . - .
1 3 1 2982
2 08CU-04219
Binary blends of polyestercarbonate resins and
polyetherimides have been prepared for the primary
purpose of improving the thermal properties of the
polyestercarbonate. See, United States Patent Number
4,430,484. Again, although these blends exhibit certain
advantageous properties, they have not been found to
possess the toughness or impact properties of
polyetherimides.
Thus, there exists a need for a polymer blend which
has good thermal properties and improved flexural
properties over polyetherimides, yet maintains the
toughness and impact properties of those polymers.
SUMMARY OF T~E INVENTION
The present invention relates to a thermoplastic
composition comprising, in admixture, (a) a
polyetherimide, (b) a rubber modified vinyl aromatic
polymer, and ~c) a polyphthalate carbonate prepared from
a dihydric phenol, a carbonate precursor, a terephthalic
acid or ester derivative thereof, and an isophthalic acid
or ester derivative thereof. The polyphthalate carbonate
is further characterized by having from about 70 to about
~5 weight percent ester content and a range of
terephthalate groups ranging from about two to about
fifteen percent of the ester content. These ternary
~5 compositions can be blended with other polymers such as
polyesters, polycarbonates and poIysulfones.
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides ternary polymeric
blends containing, in admixture, (a) a polyetherimide,
(b) a rubber modified vinyl aromatic polymer, and (c) a
polyphthalate carbonate.
: ` '; . : `
` `
1 ~ 1 29~2 08CU-04219
~ he polyetherimides tha~ can be employed ln the
present invention include repeating groups of the
formula:
-- O O
11 11
C C
/\ /\
-- N A--O ~--O--A N--R - _
~/ ~/
C C
11 11
-- O O --a
wherein ~a" represents a whole number in excess of l,
e.g., lO to lO,000 or more, the group -0-A< is selec~ed
from: .
~( r ~ 0~
o
Rl being hydrogen, lower a}kyl or lower~ alkoxy.
Preferably, the polyetherimide lncludes the latter -0-A~
group where ~' is hydrogen such that the polyetherimide
is of the formula: :: :
O : O ~
_ :: 11~ ; :
C C
-- N ~-Z-O~ N--R----
C C: ~:
_ 11 : 11 _
O O ~
and the divalent bonds of the -0-Z-0- r~adical àre~in the
3,3', 3,4', 4,3' or the 4,4' positioni Z is a member o
the class consisting of (lJ
: ~ .
~, - . "
- . . ..... , , ~ ,
~.
~ o~CU~0~219
1 31 2q82
_ CH3
CH3 CH3
CH3) ~CH3 \ ~ / ~
_ . CH3 CH3
CH3 Br Br CH3 Br Br
and ~ (CH3)2 -\ ~/
/~ ~ \ / \
CH3 ~r Br CH3 ~r Br
and (2) divalent organic radicals of the general
formula:
s
_/0\~--( X ) q--\O)--
where X is a member selected from the class consisting of
divalent radicals of the formulas,
O O
Il 11
-CyH2y~~ -C-, -S-, -0- and -S-
where ~ is 0 or 1, y is a whole number from 1 to 5, and R
is a divalent organic radical selected ~rom the class
consisting of (1) aromatic hydrocarbon radicals having
from 6 to about 20 carbon atoms and halogenated
derivatives thereofl (2) aIkylene radicals and
cycloalkylene radicals having from 2 to about 20 carbon
.. . .
'~ ~
' ' ' ' ' ' ' "
' " ' '
~ '
~ 08CU-04219
1 31 2982
atoms, (3) C2 ~o about C8 alkylene terminated
polydiorganosiloxane, and (4) divalent radical~ included
by the formula:
s
- ( _) ~ Q - ( / -
where Q is a member selected from the class consisting
of:
O O
Il 11
-O-, -C-, -S-, -5- and -CXH2X-
O
where x is a whole number from l to 5 inclusive.
Particularly preferred polyetherimides for the purposes
of the present invention include those wherein -0-A< and
Z respectively are:
CH3
and R is selected from:
\ ~ t ( ~/~ H2 ~ nd
_(~ O--\~ ~
. , :' .,' :
, : ' ' .' ' ': ' ,
.. ~ . .
.
.
0 8 CU-O 4 2 19
1 ~1 2982
The polye~herimides wherein R is m-phenylene are mo6t
preferred.
In one embodiment of the present invention the
polyetherimide may be a oopolymee which, in addition to
the etherimide units described above, further contains
repeating units of the formula:
O O
C C
/ \ / \
-N M N-R-
C C
Il 11
O O
where R is previously defined and M is selected from the
group consisting of
, ~ and ~ B
where B is -S- or -C-. These polyetherimide copolymers
are described by Williams, et al., Patent 3,983,093.
The polyetherimides can be obtained by any of the
methods well known to those skilled in the art, including
the reaction of an aromatic bis(ether anhydride) of the
formula:
,,._ '
`~ O~CU-04219
1 31 2q82
o o
Il l!
C C
~J \~o-z-o~ \~ '
C C
li 11
o n
with an organic diamine o the formula:
H2N-R--N~2
S wherein Z and R are as defined hereinbefore.
Aromatic bis(ether anhydride)s of the above formula
include, for example, 2,2-bis~4-~2,3-dicarboxyphenoxy)-
phenyl]-propane dianhydride; 4,4'-bis~2,3-
dicarboxyphenoxy)diphenyl ether dianhydride; 1,3-bis(2,3-
dicarboxyphenoxy~benzene dianhydride; 4,4'-bis~2,3-
dicarboxyphenoxy)diphenyl sulfide dianhydride; 1,4-
bis(2,3-dicarboxyphenoxy)benzene dianhydride; 4,4'-
bis(~,3-dicarboxyphenoxy)benzophenone dianhydride; 4,4'-
bis(2,~-dicarboxyphenoxy)diphenyl sulfone dianhydride;
2,2-bis[4-~3,4-dicarboxyphenoxy)phenyl3propan2
dianhydride; 4,4'-bis(3,4-dicarboxyphenoxy)diphenyl ether
dianhydride; 4,4'-bis(3,4-dicarboxyphenoxy)diphenyl
sulfide dianhydride; 1,3-bis(3,4-dicarboxyphenoxy)benzene
dianhydride; l,4-bis(3,4-dicarboxyphenoxyjbenzene
dianhydride; 1,4-bis(3,4-dicarboxyphenoxy~benzene
dianhydride; 4,4'-bis(3,4-dicarboxyphenoxy)benzophenone
dianhydride; 4-(2,3-dicarboxyphenoxy)-4'-l3,4-
dicarboxyphenoxy)diphenyl-2,2-propane dlanhydride; etc.
and mix~ures of such dianhydrides.
In additionr aromatic bis(ether anhydride)s also
included by the above formula are shown by Koton,
M.M.; Florinski, F.S.; Bessonov, M.I.; Rudakov, A.P.
(Institute of Heteroorganic Compounds, Academy of
Science, U.S.S.R.), ~.S.S.R. 2S7,010r Nov. 11, 1969,
~, . . . .
'
:
,
~ 1 3 1 2 9 8 2 08CU-04219
Appl. May 3, 1967. xn addition, dianhydridee are shown
by M.M. ~oton, F.S. Florinski, ~ !L ~ 4(5)~ 774
( 1968 ~ .
S Organic diamines of the above formula include~ for
example, m-phenylenediamine, p phenylenediamine, 4,4'-
diaminodiphenylpropane, 4,4'~diaminodiphenylmethane,
ben2idine, 4,4'-diaminodiphenyl sulfide, 4,4'-
diaminodiphenyl sulfone, 4,4'-diaminodiphenyl ether5 1,5-
diaminonaphthalene, 3,3'-dimethylbenzidine, 3,3'-
dimethoxybenzidine, 2,4-bis( -amino-t-butyl)toluene,
bis(p~ -methyl-o-aminopentyl)benzene, l,3-diamino-4-
isopropylbenzene, 1,2-bist3-aminopropoxy)-ethane, m-
xylylenediamine, p-xylylenediamine~ 2,4-diaminotoliJene,
2,6-diaminotoluene, bist4-aminocyclohexyl)-methane, 3-
methylheptamethylenediamine, 4,4-dimethylhep~amethylene~
diamine, 2,11-dodecanediamine, 2,2-dimethylpropylene-
diamine, octame~hylenediamine, 3-methoxyhexamethylene-
diamine, 2,5-dimethylhexamethylenediamine, 2,5-
dimethylheptamethylenediamine, 3-methylheptamethylene-
diamine, S-methylnonamethylenediamine, 1,4-cyclohexane-
diamine, 1,12-octadecanediamine, bis~3-aminopropyl)
sulfide, N-methyl-bis(3-aminopropyl) amine, hex~methy-
lenediamine, heptamethylenediamine, nonamethylenediamine,
decamethylenediamine, bis(3-aminopropyl)tetramethyl-
disiloxane, bis(4-aminobutyl)tetramethyldisiloxane, and
the like.
Advantageously, the reactions between the diahy-
drides and the diamines can be carried out employing well
known solvents, e.g., o-dichlorobenzene, m-cresol/
toluene, etc. at temperatures of from about 100~C to
about 250-C. Alternatively, ~he polyetherimides can be
prepared by melt polymeri2ation of any of the above
dianhydrides with any of the above diamine compounds
while heating the mixture of ingredients at elevated
temperatures with concurrent intermixing. Generally,
1 31 2982 08CU~04219
melt polymerization temperatures between about 200~C to
400-C and prefer~bly 230-C to 300-C can be employed. The
conditions of the reaction and the proportions of
ingredients can be varied widely depending on the desired
molecular weight, intrinsic viscosity, and solvent
resistance. In general, equimolar amounts of diamine and
dianhydride are employed for high molecular weight
polyetherimides; however, in certain instances, a slight
molar excess (about 1 to 5 mol percent~ of diamine can be
employed resulting in the produc~ion of polyetherimides
having terminal amine groups. Generally, useful
polyetherimides have an intrinsic viscosity 1~1 greater
than 0.2 deciliters per ~ram, preferably 0.35 to .60, or
lS 0.7 deciliters per gram or even higher when measured in
m-cresol at 25-C.
In addition to the polye~herimide, the compositions
of the present invention contain a polyphthalate
carbonate. The polyphthala~e carbonàtes useful in the
present invention are derived from a dihydric phenol, a
carbonate precursor, a terephthalic acid or acid
derivative and an isophthalic acid or acid derivative.
The polyphthalate carbonate has from about 70 to abou~ 95
weight percent es~er content and a range of terephthalate
groups from about 2 to about 15 weight percent o~ the
total ester content. These polyphthalate car~onates
are known and are described, for example, by Miller et
al., United States Patent Number 4,465,820 issued
August 14, 1984.
The dihydric phenols which can be employed to
prepare the polyphthalate carbonates useful in this
invention include the dihydric phenols generally found
useful in preparing aromatic polycarbonates. Typical
dihydric phenols which can be employed are:
2,2-bis(4-hydroxyphenyl1propane(biSphenol A1;
2,4'-dihydroxydiphenylmethane;
1 3 1 2 9 8 2 08CU-04219
bis(2-hydroxyphenyl)methane;
bis(4-hydroxyphenyl )methane;
bisl4-hydroxy-5-propylphenyl)methane;
S bis(4-hydroxy-2,~-dimethyl-3-methoxyphenyl)methane;
l,l-bis(4-hydroxyphenyl~e~hane;
l,l-bis~4-hydroxy-2 ethylphenyl~ethane;
2,2-~is(3-phenyl-4-hydroxyphenyl)propane;
bis(4-hydroxyphenyl)cyclohexylmethane; and
~,2-bis(4-hydroxyphenyl)-l-phenylpropane.
Bisphenols other ~han those having a carbon atom
betweer. the two phenols can also be employed. Examples
of such groups of bisphenols include
bis~hydroxyphenyl)sul~ides, bis(hydroxyphenyl)ethers and
lS bis~hydroxyphenyl)sulfoxides and the like.
Preferred dihydric phenols are those of the formula
l3
OH~ \ ~ OH
wherein R2 and R3 are the same or di~ferent and are
hydrogen or alkyl of from one to six carbon atoms,
inclusive. The most preferred dihydric phenol is
bisphenol A.
The aromatic dicarboxylic acids employed in the
preparation of the polyphthalate carbonate are
terephthalic acid and isophthalic acid and reactive
2~ derivatives thereof. Any derivative of a carboxylic acid
which is reactive with ~he hydroxyl of a dihydric phenol
can be employed. The acid halides are generally employed
because o~ their ease of reactivity and availability.
The acid chlorides are preferred.
~0 The carbonate precursor employed can be ei her a
carbonyl halide, a carbonate ester or a haloformate. The
carbonyl halides which can be employed are carbonyl
1312982
11
bromide, carbonyl chloride and mixtures thereof. Typical
of the carbonate esters which can be employed are
diphenyl carbonate? a di(halophenyl)carbonate such as
di(chlorophenyl)carbona~e, di(bromophenyl)carbonate,
di(trichlorophenyl)carbonate, di(tribromophenyl)
carbonate, etc.~ di~alkylphenyl)carbonate, such as
di~tolyl)carbonate, etc., di~chloronaphthyl carbonate,
etc., or mixtures thereof. The suitable haloformates
include bis-haloformates of dihydric phenols
(bischloroformates of hydroquinsne, etc~) or glycols
(bishaloformates of ethylene glycol, neopentyl glycol,
polyethylene glycol, etc.). While other carbonate
precursors will occur to those skilled in the art,
carbonyl chloride, also known as phosgene, is preferred.
The weight percent ester content in the
polyphthalate carbonate is from about 73 to about 9S,
preferably 75 to 90. Above about 95 weigh~ percent ester
content, the polyphthalate carbonate is generally more
difficult to process. Below about 70 weight percent
ester content, the distortion temperatures under load o}
the polymer are generally less than desirable. The
weight percent ester content is calculated in the manner
as described in U.S. Patent No. 4,46~,~20.
The quantity o terephthalate units present in the
polyphthalate carbonate can range from about 2 to about
15 weight percent, with the remaining ester units being
i~ophthalate units. When the terephthalate units are
below 2 weight percent, the Notched Izod impact
resistance of the polyphthalate carbonate is undesirably
low~ Above 15 weight percent terephthalate, the
resistance of the polymer to stress cracking is lowered.
Preferably, the amount of terephthalate units ranges fro~
about 5 to about 10 weight percent.
08CU-04219
1 31 2982
In addition to the polyetherimide component and
polyphthalate component, the present ~nventlon contains a
rubber modified vinyl aromatic polymer. The rubber
modified vinyl aroma~ic polymers of the blends of the
S invention contain homopolymers and~or copolymers derived
from a vinyl aromat~c monomer of the structural formula
~ =CHR5
where R4 and R5 are selected from the qroup consisting of
hydroqen and lower alkyl or lower alkenyl groups of fro~
1 to 6 carbon atoms; R6 and R7 are selected from the
group consisting of hydrogen, halogen such as chlorine or
bromine, and lower alkyl of 1 to 6 carbon atoms: ~8 and
~9 are selected from the groups consisting of hydrogen
and lower alkyl and alkenyl groups of 1 to 6 carbon atoms
or Rg and Rg may form an unsaturated hydrocarbyl ring
structure.
Generally, the rubber modified vinyl aromatic
polymers are derived from at least 25~, preferably at
least about 50%, of the above vinyl aromatic monomers.
Vinyl aromatic monomers of the above formula incl~de
s~yrene, ~-methylstyrene, t-butylstyrene, vinyl toluene,
vinyl xylene, ethyl vinyl benzene, chlorostyrene, ethyl
vlnyl toluene, isopropenyl toluene and diethyl vinyl
benzene. A preferred vinyl aromatic monomer is styrene.
.~ 08C~J-04219
1 3 1 2q82
Other monomers which can be copolymerized with the
above vinyl aromatic monomers ~nclude tho~e of the
general formula:
Rlo-- c~ c ~ _ (CH~)n ~ R12
1~
wherein R1o and R11 are selected from ~he group
consisting of hydrogen, halogen, alkyl groups of 1 to 4
carbon atoms, carboalXoxy or Rl O and Rl ~I taken toge~her
represent an anhydride linkage (-COOOC-i and ~12 i~
selected ~rom hydrogen, vinyl, alkyl or alkenyl groups
having from 1 to 12 carbon atoms, cycloalkyl,
carboalXoxy, alkoxy-alkyl, alkyl carboxy, ketoxy,
halogen, carboxy, cyano or pyridyl and n is 0 or an
integer ~rom 1 to 9. Copolymerizable monomers of the
above formula include acrylonitrile, methacrylonitrile,
acrylic acid, methacxylic acid, maleic anhydride, vinyl
chloride, vinylidene chloride, methyl methacrylate, ethyl
acrylate, acrylamide, butadiene, isoprene and the li~e.
The above vinyl aromatic homopolymers or copolymers
are modified by the incorporation of a rubber or
elastomeric material. Such an incorporation can be
accomplished by blendinq or graft or b~ock
copolymerization with the homopolymer or oopolymer
deri~ed from the vinyl aromatic monomer. Suitable
rubbers include polymers of aliphatic conjugated dienes
such as 1,3~butadiene, isoprene, methylisoprene as well
as ethylene propylene copolymers and EPDM rubber.
Preferred rubber modified vinyl aromatic polymers
for the purposes of the present invention include the
various qrades of methylmethacrylate-butadiene-styrene
(MBS), styrene-ethylene-butylene-styrene (SEBS),
acrylonitrile-butadiene-styrene (~BS) and hiqh impact
` 1 31 2982 08CU-04219
14
polystyrene (~IPS3 which is polystyrene containiny from
about 3 to 10% by weight of polybutadiene or 2
styrene-butadiene copolymer.
The rubber modified vinyl aromatic polymers used ~n
the blends of this invention ca~ be prepared by any of
the techniques well known in the ar~. For example, a
method for preparing acrylonitrile-butadiene-styrene or
acrylonitrile-butadiene-methylstyrene type polymers
comprises grafting 73 parts styrene and 42 parts
acrylonitrile onto polybutadiene latex containing 58
parts polybutadiene in the presence of 3 parts soap, 1~7
parts mercaptan and 0.4 parts potassium peroxydisulfate
at SO-C. The latex is coagulated and the product is then
milled for 10 minutes a~ 320-F. Other use4ul methods for
lS preparing thesa polymers may be found in u.S. Patent
No. 2,505,349, U.S. Patent No. 2,550,139; U.S.
Patent No. 2,698,313; U.~. Patent No. 698,385; U.S.
Patent No. 2,713,566; U.S. Patent No. 2,820,773:
and United States Patent Numb0r 2,908, 661. In
addition, a great number of these polymers are
available commercially.
The polyetherimides, polyphthalate carbonates and
rubber modified vinyl aromatic polymers are combinable
with each other in a wide variety of propor ions.
Accordingly, compositions comprising from 1 ~o 98 percent
by weight of a polyetherimide, from 1 ~o 98 percent by
weight of a polyphthalate carbonate, and 1 to 98 percent
by weight of rubber modified vinyl aromatic polymer are
included within the scope of the present invention.
Preferably, the ternary blend comprises from about 1 to
about 96 percent by weight of polyetherimide, from about
1 to about 96 percent by weight of polyphthalate
carbonate, and 3 to 20 percent by weight of rubber
modified vinyl aromatic polymer. A partic~larly
preferred ternary blend comprises from about 1 to 96
1 31 2982 08CU-04219
percent by weight polyetherimide, from abo~ 1 to 96
percent by weight o~ polyphthalate carbonate, and from
about 8 to 15 percent by weight of rubber modified vinyl
aromatic polymer. By controlling the proportlon~ of each
component, blends can be formed having improved
properties over those of either a polyetherimide alone, a
polyphthalate rarbona~e alone, a rubber modified aromatic
polymer alone or combination of any two of the foregoing.
Generally, with increasing levels of polyetherimide, the
higher the flexural s~rength, flexural modulus, flexural
retardancy and heat distortion temperature will be of the
resulting blend. With increasing levels of polyph~halate
carbona~e, the higher the IZOD impact value of the blends
will be. With increasing levels o~ rubber modified vinyl
aromatic pol~mer, the lower the flexural values will be.
Methods for forming the polye~herimide/polyphtha-
late carbonate/rubber modified vinyl aromatic pol~mer
blends of the present invention may vary considerably.
Prior art blending techniques are generally satisfactory.
A preferred method comprises blending the polymers and
additives such as reinforcements in powder, granular or
filamentous form, extruding the blend, and chopping the
extrudate into pellets suitable for molding by means
conveniently used to mold normally solid thermoplastiC
compositions.
If desired, the ternary blends of the present
invention can be modified by adding amounts of another
polymer or polymers. Examples of such polymers include,
polyesters, polycarbonates and polysulfones.
The following examples are set forth to fur~her
illustrate the present invention and are not to be
construed as limiting the invention.
~ 08CU-04219
1 31 2q8~
16
Examples 1-4
A series of ternary blends containing a
polyetherimide, a polyphthalate carbonate (PPC) and high
impact styrene (~IPS) was prepared accordlng to the
present invention. The polymer-blends were melt blended~
the blend was molded into test specimens, and th~
specimens were tested for their physical properties. The
polyetherimide that was used is commercially available
from the General Electric Company under the trademark
Ultem~ 1000. The polyphthalate carbonate that was used
is commercially available from the General Electric
Company and is identified as Lexan~ PPC-4701. ~he high
impact styrene tHIPS) that was used was purchased from
Foster Grant under the designation FG-840.
The test results and the respective concentration of
each component are shown in the table below,
TABLE I
Example 1 2_ 4
Polyether~de 12.5~ 12.5 34.0 75.0 1
PPC 12.575.0 33.0 12.5
~PS 75.01~.5 33.0 12.5
Extruded C 266 282 282 293
Molded C 293 293 293 293
I20~ Impact1
Notched 1/8" bar 0.20 4 7 1 00~ 1~ 3
IZOD Impact1 Rev
Notched l/a" bar
(t ~ /in) 0.6 15 201 3.2
~exural modulus2
(psi~ 341,500 328,900 366,500 423,000
Flexural
Strength2 ~psi)4,31613,480 10,700 16,150
Heat Distortion
Temperature3 C
264 psi 82~1150.8 128.8 177.6
-
1 Tested a~cordi~ to ASTMmethod D-256
2 Tested according to ASTM me~x~ D-790
3 Tested according to ASTM method D-648
. . .
1 3 1 2 9 8 2 08CU-04219
The compositions o~ the presen~ inventlon have
application in a wide var~ety of phys~cal ~hapes and
for~, including ~he use as films, molding compounds~
coatings, etc. When used as f~lms or when made lnto
molded products, these polymers, includin~ laminated
produc~s prepared therefrom~ no~ only possess good
physical properties at room temperature but they retain
their strength and excellent response to workloading at
elevated temperatures fcr long periods of time. Films
formed from the polymeric compositions of th~s invention
may be used in application where films have been used
previously Thus, the compositions of the present
invention can ~e used in au~omobile and aviation
applications for decorative and pro~ective purposes, and
as high temperature electrical insulation for motor slot
liners, in trans~ormers, as dielectric capacitors, as
coil and cable wrapings (form wound coil insulation for
motors), for containers and container linings, in
laminating s~ruc~ures where films o the present
composition or where solutions of the claimed
compositions of matter are applied to various
heat-resis~ant or other type of materials such as
asbestos, mica, glass fiber and the like and
superimposing the sheets one upon the other and
thereafter subjecting them to elevated temperatures and
pressures to effect flow and cure of the resinous binder
to yield cohesive laminated structures. Films made from
these compositions of mat~er can also serve in printed
circuit applications
Alternatively, solutions of the compositions herein
described can be coated on electrical conductors such as
copper, aluminum, etc., and thereafter the coated
conductor can be heated a~ elevated temperatures to
remove the solvent and to effect curing of the resinous
composition thereon If desired, an additional overcoat
~ 08CU-04219
1 3 1 2q82
1~
may be applied to ~uch insulated conductor8 ~ncluding th~
u~e o~ polymeric coatings, such as polyam~des,
polyesters, ~ilicones, polyvinyl for~al resin~, epoxy
resins, polyimides, polyte~rafluoro~etAylene, etc. ~he
use of ~he curable compositions of the present invention
as overcoa~ on other types of lnsulatlon is not
precluded.
In addition, molding compositions and molded
articles may be formed from the poly~eric compositions in
10 this inven~ion by incorporating such fillers a~ asbesto~,
glass fibers, talc~ quartz powder, wood flour, finely
divided carbon, and silica, into such compositions prior
to molding. Shaped articles are formed under heat, or
under heat and pressure in accordance with practices well
~nown in the art. In addition, various heat-resistant
pigments and dyes may be incorporated as well as various
types of inhibitors depending on the application
intended.
Other modification and variations of the present
invention are possible in light of the above teachings.
It is, therefore, to be understood that changes may be
made in the particular embodiments o~ the invention
described which are within the full intended scope of the
invention as deined by the appended claims.
::
: ' . . .:
