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US 4,544,704 AGranted
Polymeric cyanate compositions
AssigneeThe Dow Chemical Company
InventorRobert E. Hefner, Jr.
Life of this patent
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Abstract
New compositions of matter are disclosed which comprise (1) a copolymer of an ethylenically unsaturated aromatic cyanate and a polymerizable ethylenically unsaturated compound which is free of cyanate groups or mixture thereof, (2) optionally a polycyanate or mixture thereof and/or (3) an epoxy resin.
Claims46
A composition which comprises
- (A) from about 1 to 100 percent by weight (pbw) of a polymeric cyanate or mixture of polymeric cyanates represented by the formula ##STR9## wherein each R, R.sup.1 and R.sup.2 is independently hydrogen or an alkyl group having from 1 to about 3 carbon atoms;
- R.sup.3 is an alkyl group having from 1 to about 3 carbon atoms;
- each X and X' is independently an alkyl group having from 1 to about 4 carbon atoms, chlorine or bromine;
- Q is independently a group derived from any suitable polymerization initiator or terminator, hydrogen, ##STR10## wherein each R, R.sup.1, and R.sup.2 is as defined above, and wherein each aromatic ring may contain any substituent group as those enumerated in the formula I;
- n has a value of from about 1 to about 5000;
- n.sup.1 has a value from about 1 to about 5000;
- n.sup.2 has a value of from about zero to about 1000;
- n.sup.3 has a value from about zero to about 1000;
- and each x and x' independently has a value from zero to 4;
- and
- (B) from zero to about 99 pbw of an aromatic polycyanate or mixture of aromatic polycyanates represented by the formula:
- ##STR11## wherein each Z is independently hydrogen, an alkyl group having from 1 to about 4 carbon atoms, chlorine, bromine, or a ##STR12## Z' is a direct bond, an alkylene group with 1 to 5 carbon atoms, --S--, --S--S--, --O--, ##STR13## y has a value from zero to 5 when m has a value of 1 to 3;
- y has a value from 2 to 5 when m has a value of zero;
- x.sup.1 has a value of 5 minus the value of y when m has a value of 1 to 3;
- x.sup.1 has a value of 6 minus the value of y plus y.sup.2 when m has a value of zero;
- x.sup.2 has a value of 5 minus the value of y.sup.2 ;
- y.sup.2 has a value of zero to 5;
- m has a value of zero to 3;
- with the proviso that the sum of y and y.sup.2 is always at least two;
- and
- (C) from zero to about 99 pbw of an epoxy resin or mixture of epoxy resins represented by the formulas ##STR14## wherein R, Z and x are as hereinbefore defined;
- each A is independently a hydrocarbyl group having from 1 to about 10 carbon atoms, --S--, --S--S--, --O--, ##STR15## each A' is independently a hydrocarbyl group having from 1 to about 10 carbon atoms, each y independently has a value of zero or 1;
- m.sup.1 has a value of zero to about 99;
- m.sup.2 has a value of 1 to 10 and wherein the pbw of the individual components is based upon total composition.
21 more elements
Dependencies are inferred from the claim text.