Curable liquid polymer compositions
AssigneeW. R. Grace & Co.
InventorClifton L. Kehr
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Abstract
This invention relates to a new curable composition which includes a liquid unsaturated component having at least two vinyl addition polymerizable groupings per average molecule and a polythiol component having a multiplicity of --SH functional groups per average molecule which cures to a solid polythioether in the presence of a free radical generator. When the free radical generator is actinic radiation, e.g. U. V. light, a photocuring rate accelerator, e.g. benzophenone is added to the composition. The cured product can be used as a coating, sealant, adhesive or molded article.
Claims19
A composition curable in the presence of a free radical generating agent comprising:
- I. 98 to 2% by weight of the composition of a liquid polyene component of the formula
- [A--X).sub.m
- wherein m is an integer of at least 2, X is ##STR12## and A is a polyvalent organic moiety, free of reactive carbon to carbon unsaturation and of highly water-sensitive members and consisting of atoms selected from the group consisting of carbon, hydrogen, oxygen, nitrogen, chlorine, bromine, fluorine, phosphorous and silicon;
- and R is a radical selected from the group consisting of hydrogen, phenyl and an alkyl containing 1 to 9 carbon atoms;
- and,
- Ii. 2 to 98% by weight of the composition of a polythiol having a molecular weight in the range from about 95 to 20,000 of the general formula:
- R.sub.8 --SH).sub.n
- wherein R.sub.8 is a polyvalent organic moiety and n is at least 2, the reactive unsaturated carbon to carbon bonds per molecule in the polyene and the thiol groups per molecule in the polythiol being greater than 4.
A process of forming a solid cured polythioether which comprises
- 1. admixing a composition comprising:
- I. 98 to 2% by weight of the composition of a liquid polyene component of the formula
- [A--X).sub.m
- wherein m is an integer of at least 2, X is ##STR13## and A is a polyvalent organic moiety free of reactive carbon to carbon unsaturation and of highly water-sensitive members and consisting of atoms selected from the group consisting of carbon, hydrogen, oxygen, nitrogen, chlorine, bromine, fluorine, phosphorous and silicon;
- and R is a radical selected from the group consisting of hydrogen, phenyl and an alkyl containing 1 to 9 carbon atoms;
- Ii. 2 to 98% by weight of the composition of a polythiol having a molecular weight in the range from about 94 to 20,000 of the general formula:
- R.sub.8 --SH).sub.n
- wherein R.sub.8 is a polyvalent organic moiety and n is at least 2, the reactive unsaturated carbon to carbon bonds per molecule in the polyene and the thiol groups per molecule in the polythiol being greater than 4, and
- 2. exposing the mixture to a free radical generating agent.
A composition capable of being crosslinked solely by radiation to form thioether groups between the carbon-to-carbon unsaturation of I and the thiol groups of II comprising:
- I. 98 to 2% by weight of the composition of a liquid polyene component of the formula
- [A--X).sub.m
- wherein m is an integer of at least 2, X is ##STR14## and A is a polyvalent organic moiety, free of reactive carbon to carbon unsaturation and of highly water-sensitive members and consisting of atoms selected from the group consisting of carbon, hydrogen, oxygen, nitrogen, chlorine, bromine, fluorine, phosphorous and silicon;
- and R is a radical selected from the group consisting of hydrogen, phenyl and an alkyl containing 1 to 9 carbon atoms;
- and,
- Ii. 2 to 98% by weight of the composition of a polythiol having a molecular weight in the range from about 95 to 20,000 of the general formula:
- R.sub.8 --SH).sub.n
- wherein R.sub.8 is a polyvalent organic moiety and n is at least 2, the reactive unsaturated carbon to carbon bonds per molecule in the polyene and the thiol groups per molecule in the polythiol being greater than 4.
A process of forming a solid cured polythioether which consists essentially of
- 1. admixing a composition consisting essentially of:
- I. 98 to 2% by weight of the composition of a liquid polyene component of the formula
- [A--X).sub.m
- wherein m is an integer of at least 2, X is ##STR15## and A is a polyvalent organic moiety free of reactive carbon to carbon unsaturation and of highly water-sensitive members and consisting of atoms selected from the group consisting of carbon, hydrogen, oxygen, nitrogen, chlorine, bromine, fluorine, phosphorous and silocon;
- and R is a radical selected from the group consisting of hydrogen, phenyl and an alkyl containing 1 to 9 carbon atoms;
- Ii. 2 to 98% by weight of the composition of a polythiol having a molecular weight in the range from about 94 to 20,000 of the general formula:
- R.sub.8 --SH).sub.n
- wherein R.sub.8 is a polyvalent organic moiety and n is at least 2, the reactive unsaturated carbon to carbon bonds per molecule in the polyene and the thiol groups per molecule in the polythiol being greater than 4, and
- 2. exposing the mixture to a free radical generating agent.
Dependencies are inferred from the claim text.