Diethylene glycol bis(allyl carbonate) compositions containing crosslinkable copolymers
AssigneePennwalt Corporation
InventorChristopher J. Dyball
Life of this patent
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Abstract
When an acrylic monomer such as methyl methacrylate is copolymerized with an allyl monomer such as allyl methacrylate whereby the resulting copolymer has active pendant allyl groups, this copolymer is then crosslinked with diethylene glycol bis (allyl carbonate) monomer (called ADC). The resulting product has considerable reduction in shrinkage while maintaining optical clarity and is useful as lenses.
Claims9
A composition consisting essentially of 25 to 99 percent by weight of diethylene glycol bis(allyl carbonate) monomer, and
- 1 to 75 percent by weight of a copolymer having a molecular weight of 1,000 to 100,000 prepared by reacting
- (i) at least one allyl ester, substituted allyl ester, N-allyl substituted amide or N-N-diallyl substituted amide of an .alpha.-B unsaturated carboxylic or dicarboxylic lic acid;
- or an allyl substituted monovinyl aromatic compound.
- (ii) at least one lower alkyl methacrylate, optionally together with a minor amount of one or more vinyl or vinylidene monomers which are polymerizable by a free radical mechanism.
A composition consisting essentially of 25 to 99 percent by weight of diethylene glycol bis-(allyl carbonate) monomer,
- 1 to 75 percent by weight of a copolymer having a molecular weight of 1,000 to 100,000 prepared by reacting
- (i) at least one compound having the formula ##STR11## Z is ##STR12## or A-R.sub.4 where R.sub.4 is aryl of 6 to 15 carbons;
- When Z is A-R.sub.4, Y is hydrogen and R is hydrogen or CH.sub.3 --;
- When Z is ##STR13## Y is hydrogen or ##STR14## and R is hydrogen, CH.sub.3 --, or ##STR15## where A is ##STR16## R.sub.2 is hydrogen or CH.sub.3 ;
- X is --O-- or ##STR17## R.sub.3 is A, hydrogen, alkyl of 1 to 10 carbons, aryl of 6 to 12 carbons, cycloalkyl of 3 to 12 carbons or aralkyl of 7 to 15 carbons;
- R.sub.1 is A or R.sub.3 with the proviso that when Y is ##STR18## R is hydrogen and when R is ##STR19## Y is hydrogen;
- and (ii) at least one lower alkyl methacrylate, optionally together with a minor amount of one or more monomers selected from:
- .alpha.-.beta. unsaturated carboxylic or dicarboxylic acids, their esters or anhydrides, vinyl aromatics, dienes, vinyl esters, vinyl chloride, vinylidene chloride, acrylonitrile or methacrylonitrile.
Dependencies are inferred from the claim text.