Patent ID: 11970561
Assignee: KURARAY CO., LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  B  Y | IPC B  C

Claim 4:
5. A modified liquid diene polymer (B2) comprising a product of modification, with a silane compound represented by the formula (1) below, of a liquid diene block copolymer (B′2) including a polymer block (b″1) containing butadiene units and a polymer block (b″2), the modified liquid diene polymer (B2) having a functional group derived from the silane compound represented by the formula (1) introduced at a polymer side chain, the modified liquid diene polymer (B2) satisfying the following (v) to (vii):
(v) the weight average molecular weight (Mw) of the modified liquid diene polymer (B2) is 1,000 to 120,000,
(vi) the polymer block (b″2) includes conjugated diene units other than butadiene, and
(vii) the average number of the functional groups per molecule of the modified liquid diene polymer (B2) is 1 to 20,, wherein R1 is a C1-6 divalent alkylene group, and R2, R3 and R4 are each independently a methoxy group, an ethoxy group, a phenoxy group, a methyl group, an ethyl group or a phenyl group, with the proviso that at least one of R2, R3 and R4 is a methoxy group, an ethoxy group or a phenoxy group, wherein the modified liquid diene polymer (B2) is a linear polymer, the polymer block (b″1) is present at one end or both ends of the liquid diene block copolymer (B′2), and the total length of the polymer block(s) (b″1) is not more than 45% of all the chain length of the liquid diene block copolymer (B′2).