Curing agent, preparation thereof and curable composition comprising the same

Claim 1

An organic curing agent having at least two hydrosilyl groups in a molecule, which is prepared by reacting (A) a non-polymeric organic compound having at least one alkenyl group in a molecule, of the formula: ##STR44## wherein R 7 is a hydrocarbon group having 0 to 18 carbon atoms which may have at least one ether linkage, R 8 is a hydrogen atom or a methyl group, R 3 is an organic group having 1 to 30 carbon atoms, and a is an integer of 1 to 4, the formula: ##STR45## wherein R 7 is a hydrocarbon group having 0 to 18 carbon atoms which may have at least one ether linkage, R 8 is a hydrogen atom or a methyl group, R 4 is an organic group having 1 to 30 carbon atoms, and a is an integer of 1 to 4, the formula: ##STR46## wherein R 8 is a hydrogen atom or a methyl group, R 5 is a mono-, di-, tri-, or tetra-valent hydrocarbon group having 2 to 50 carbon atoms, and a is an integer of 1 to 4, or the formula: ##STR47## wherein R 7 is a hydrocarbon group having 0 to 18 carbon atoms which may have at least one ether linkage, R 8 is a hydrogen atom and a methyl group, R 6 is an organic group having 1 to 30 carbon atoms, and a is an integer of 1 to 4, with (B) a polyvalent hydrogensilicon compound of the formula: ##STR48## wherein 1≧2 and 1+m+n=3-50, or the formula: ##STR49## wherein 1≧2, p+1+m+n=3-20, and R═CH 3 , C 2 H 5 , or C 6 H 5 , in the presence of a hydrosilylation catalyst so that at least two hydrosilyl groups remain after the reaction.

Claim 4

A method for preparing an organic curing agent having at least two hydrosilyl groups in a molecule, which method comprises reacting (A) a non-polymeric organic compound having at least one alkenyl group in a molecule, of the formula: ##STR51## wherein R 7 is a hydrocarbon group having 0 to 18 carbon atoms which may have at least one ether linkage, R 8 is a hydrogen atom or a methyl group, R 3 is an organic group having 1 to 30 carbon atoms, and a is an integer of 1 to 4, the formula: ##STR52## wherein R 7 is a hydrocarbon group having 0 to 18 carbon atoms which may have at least one ether linkage, R 8 is a hydrogen atom or a methyl group, R 4 is an organic group having 1 to 30 carbon atoms, and a is an integer of 1 to 4, the formula: ##STR53## wherein R 8 is a hydrogen atom or a methyl group, R 5 is a mono-, di-, tri-, or tetra-valent hydrocarbon group having 2 to 50 carbon atoms, and a is an integer of 1 to 4, or the formula: ##STR54## wherein R 7 is a hydrocarbon group having 0 to 18 carbon atoms which may have at least one ether linkage, R 8 is a hydrogen atom and a methyl group, R 6 is an organic group having 1 to 30 carbon atoms, and a is an integer of 1 to 4, with (B) a polvalent hydrogensilicon compound of the formula: ##STR55## wherein 1≧2 and 1+m+n=3-50, or the formula: ##STR56## wherein 1≧2, p+1+m+n=3-20, and R═CH 3 , C 2 H 5 , or C 6 H 5 , in the presence of a hydrosilylation catalyst so that at least two hydrosilyl groups remain after the reaction.

Claim 5

A method for preparing an organic curing agent having at least two hydrosilyl groups in a molecule, which method comprises reacting (A) a non-polymeric organic compound having at least one alkenyl group in a molecule, of the formula: ##STR51## wherein R 7 is a hydrocarbon group having 0 to 18 carbon atoms which may have at least one ether linkage, R 8 is a hydrogen atom or a methyl group, R 3 is an organic group having 1 to 30 carbon atoms, and a is an integer of 1 to 4, the formula: ##STR52## wherein R 7 is a hydrocarbon group having 0 to 18 carbon atoms which may have at least one ether linkage, R 8 is a hydrogen atom or a methyl group, R 4 is an organic group having 1 to 30 carbon atoms, and a is an integer of 1 to 4, the formula: ##STR53## wherein R 8 is a hydrogen atom or a methyl group, R 5 is a mono-, di-, tri-, or tetra-valent hydrocarbon group having 2 to 50 carbon atoms, and a is an integer of 1 to 4, or the formula: ##STR54## wherein R 7 is a hydrocarbon group having 0 to 18 carbon atoms which may have at least one ether linkage, R 8 is a hydrogen atom and a methyl group, R 6 is an organic group having 1 to 30 carbon atoms, and a is an integer of 1 to 4, with (B) a polvalent hydrogensilicon compound of the formula: ##STR55## wherein 1≧2 and 1+m+n=3-50, or the formula: ##STR56## wherein 1≧2, p+1+m+n=3-20, and R═CH 3 , C 2 H 5 , or C 6 H 5 , in the presence of a hydrosilylation catalyst so that at least two hydrosilyl groups remain after the reaction.