Curable isobutylene polymer, a curable composition containing it, and a cured product thereof

Claim 2

An isobutylene polymer having at least one silicon-containing group cross-linkable by the formation of a siloxane bond.

Claim 3

The polymer of Claim l, wherein said silicon-­containing group is present at the molecular ends.

Claim 4

The polymer of Claim l, wherein said silicon-­containing group is represented by the formula (l): wherein R¹ and R² are the same or different and each is a member selected from the group consisting of an alkyl group having l 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): (Rʹ)₃SiO-       (7) in which each Rʹ is independently a monovalent hydrocarbon group having l 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, l, 2 or 3, and b is 0, l or 2, provided that the sum of a and b is l or more; and m is 0 or an integer of l to l8.

Claim 5

The polymer of Claim 3, wherein X is a member selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkoxyl group, an acyloxyl group, a ketoxymate group, an amino group, an amido group, an aminoxy group, a mercepto group and an alkenyloxy group.

Claim 6

The polymer of Claim 3, wherein said X is an alkoxyl group.

Claim 7

The polymer of Claim l, wherein said silicon-­containing group is represented by the formula (4): wherein R¹ and R² are the same or different and each is a member selected from the group consisting of an alkyl group having l 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): (Rʹ)₃SiO-      (7) in which each R' is independently a monovalent hydrocarbon group having l to 20 carbon atoms; R³ is a member selected from the group consisting of a hydrogen atom, an alkyl group having l to 8 carbon atoms, an aryl group having 6 to 20 carbon atoms, and an 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, l, 2 or 3, and b is 0, l or 2, provided that the sum of a and b is l or more; and m is 0 or a integer of l to l8.

Claim 8

The polymer of Claim 6, wherein said R³ is a methyl group.

Claim 9

The polymer of Claim l, wherein said silicon-containing group is represented by the formula (6): wherein R¹ and R² are the same or different and each is a member selected from the group consisting of an alkyl group having l 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): (Rʹ)₃SiO-       (7) in which each Rʹ is independently a monovalent hydrocarbon group having l to 20 carbon atoms; R³ is a member selected from the group consisting of a hydrogen atom, an alkyl group having l to 8 carbon atoms, an aryl group having 6 to 20 carbon atoms, and an aralkyl group having 7 to 20 carbon atoms; R4 is a bivalent hydrocarbon group having l to l0 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, l, 2 or 3, and b is 0, l or 2, provided that the sum of a and b is l or more; and m is 0 or an integer of l to l8.

Claim 10

The polymer of Claim 8, wherein R³ is methyl group.

Claim 11

l0. The polymer of Claim l, 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): wherein R³ is a member selected from the group consisting of a hydrogen atom, an alkyl group having l 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): wherein R¹ and R² are the same or different and each is a member selected from the group consisting of an alkyl group having l 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): (Rʹ)₃SiO-       (7) in which each Rʹ is independently a monovalent hydrocarbon group having l 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, l, 2 or 3, b is 0, l or 2, provided that the sum of a and b is l or more; and m is 0 or a integer of l to l8.

Claim 12

The polymer of Claim l, 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): wherein R³ is a member selected from the group consisting of hydrogen atom, an alkyl group having l 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): wherein R¹ and R² are the same or different and each is a member selected from the group consisting of an alkyl group having l 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): (Rʹ)3SiO-      (7) in which each Rʹ is independently a monovalent hydrocarbon group having l to 20 carbon atoms; R⁴ is a hydrocarbon group having l to l0 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, l, 2 or 3, and b is 0, l or 2, provided that the sum of a and b is l or more; and m is 0 or an integer of l to l8.

Claim 13

A composition containing an isobutylene polymer having at least one silicon-containing group cross-linkable by the formation of a siloxane bond and silanol condensation catalysts.

Claim 14

A composition containing an isobutylene polymer having at least one silicon-containing group cross-linkable by the formation of a siloxane bond and silanol condensation catalysts.

Claim 15

A cured product of an isobutylene polymer having at least one silicon-containing group cross-­linkable by the formation of a siloxane bond.

Claim 16

A cured product of an isobutylene polymer having at least one silicon-containing group cross-­linkable by the formation of a siloxane bond.