Curable isobutylene polymer

Claim 2

An isobutylene polymer having an average of 1.2 to 4 silicon-containing groups at its ends, said silicon-containing groups being cross-linkable by the formation of a siloxane bond.

Claim 3

The polymer of claim 1, wherein said silicon-containing group is represented by the formula (1): ##STR37## wherein R 1 and R 2 are the same or different and each is a member selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon aboms, an aralkyl group having 7 to 20 carbon atoms and a triorganosiloxy group having the formula (7): (R').sub.3 SiO-- (7) in which each R' is independently a monovalent hydrocarbon group having 1 to 20 carbon atoms; X is a hydroxyl group or a hydrolyzable group and when more than one X is present, X groups are the same or different; a is 0, 1, 2 or 3, and b is 0, 1 or 2, provided that the sum of a and b is 1 or more; and m is 0 or an integer of 1 to 18.

Claim 4

The polymer of claim 2, wherein X is a member selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkoxyl group, an acyloxy group, a ketoxymate group, an amino group, an amido group, an aminoxy group, a mercepto group and an alkenyloxy group.

Claim 5

The polymer of claim 2, wherein said X is an alkoxyl group.

Claim 6

The polymer of claim 1, wherein said silicon-containing group is represented by the formula (4): ##STR38## wherein R 1 and R 2 are the same or different and each is a member selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, and a triorganosiloxy group having the formula (7): (R').sub.3 SiO-- (7) in which each R' is independently a monovalent hydrocarbon group having 1 to 20 carbon atoms; R 3 is a member selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 20 carbon atoms, and aralkyl group having 7 to 20 carbon atoms; X is a hydroxyl group or a hydrolyzable group and when more than one X is present, the X groups are the same or different; a is 0, 1, 2 or 3, and b is 0, 1 or 2, provided that the sum of a and b is 1 or more; and m is 0 or a integer of 1 to 18.

Claim 7

The polymer of claim 5, wherein said R 3 is a methyl group.

Claim 8

The polymer of claim 1, wherein said silicon-containing group is represented by the formula (6): ##STR39## wherein R 1 and R 2 are the same or different and each is a member selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, and a triorganosiloxy group having the formula (7): (R').sub.3 SiO-- (7) in which each R' is independently a monovalent hydrocarbon group having 1 to 20 carbon atoms; R 3 is a member selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 20 carbon atoms, and an aralkyl group having 7 to 20 carbon atoms; R 4 is a bivalent hydrocarbon group having 1 to 10 carbon atoms; X is a hydroxyl group or a hydrolyzable group and when more than one X is present, the X groups are the same or different; a is 0, 1, 2 or 3, and b is 0, 1 or 2, provided that the sum of a and b is 1 or more; and m is 0 or an integer of 1 to 18.

Claim 9

The polymer of claim 7, wherein R 3 is methyl group.

Claim 10

The polymer of claim 1, which is obtained by a hydrosilylation of an isobutylene polymer having, at the molecular ends, at least one unsaturated group represented by the formula (2): ##STR40## wherein R 3 is a member selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 20 carbon atoms and an aralkyl group having 7 to 20 carbon atoms, and a hydrosilane represented by the formula (3): ##STR41## wherein R 1 and R 2 are the same or different and each is a member selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, and a triorganosiloxy group having the formula (7): (R').sub.3 SiO-- (7) in which each R' is independently a monovalent hydrocarbon group having 1 to 20 carbon atoms; X is a hydroxyl group or a hydrolyzable group and when more than one X is present, the X groups are the same or different; a is 0, 1, 2 or 3, b is 0, 1 or 2, provided that the sum of a and b is 1 or more; and m is 0 or a integer of 1 to 18.

Claim 11

The polymer of claim 1, which is obtained by a radical addition reaction, in the presence of a source for generating a radical, of an isobutylene polymer having, at the molecular ends, at least one unsaturated group represented by the formula (2): ##STR42## wherein R 3 is a member selected from the group consisting of hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 20 carbon atoms and an aralkyl group having 7 to 20 carbon atoms, and a mercaptan compound represented by the formula (5): ##STR43## wherein R 1 and R 2 are the same or different and each is a member selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, and a triorganosiloxy group having the formula (7): (R').sub.3 SiO-- (7) in which each R' is independently a monovalent hydrocarbon group having 1 to 20 carbon atoms; R 4 is a hydrocarbon group having 1 to 10 carbon atoms; X is a hydroxyl group or a hydrolyzable group and when more than one X is present, the X groups are the same or different; a is 0, 1, 2 or 3, and b is 0, 1 or 2, provided that the sum of a and b is 1 or more; and m is 0 or an integer of 1 to 18.

Claim 12

A composition containing silanol condensation catalysts and an isobutylene polymer having an average of 1.2 to 4 silicon-containing groups at its ends, said silicon-containing groups being cross-linkable by the formation of a siloxane bond.

Claim 13

A composition containing silanol condensation catalysts and an isobutylene polymer having an average of 1.2 to 4 silicon-containing groups at its ends, said silicon-containing groups being cross-linkable by the formation of a siloxane bond.

Claim 14

A cured product of an isobutylene polymer having an average of 1.2 to 4 silicon-containing groups at its ends, said silicone-containing groups being cross-linked by the formation of a siloxane bond.

Claim 15

A cured product of an isobutylene polymer having an average of 1.2 to 4 silicon-containing groups at its ends, said silicone-containing groups being cross-linked by the formation of a siloxane bond.