AROMATIC VINYL/ISOPRENE BLOCK COPOLYMER, PROCESS FOR THE PRODUCTION THEREOF, AND HARDENABLE PRESSURE-SENSITIVE ADHESIVE COMPOSITION CONTAINING THE SAME

Title:

AROMATIC VINYL/ISOPRENE BLOCK COPOLYMER, PROCESS FOR THE PRODUCTION THEREOF, AND HARDENABLE PRESSURE-SENSITIVE ADHESIVE COMPOSITION CONTAINING THE SAME

Document Type and Number:

WIPO Patent Application WO/1998/018840

Kind Code:

A1

Abstract:

An aromatic vinyl/isoprene block copolymer comprising 5 to 50 wt. % of a branch component represented by the general formula: (A-B)�n?X (wherein A is an aromatic vinyl polymer block; B is an isoprene polymer block; and X is a residue of a polyfunctional coupling agent) and 50 to 95 wt. % of a diblock component represented by the general formula: A-B (wherein A and B are each as defined above). This copolymer can be prepared by polymerizing an aromatic vinyl monomer in the presence of an organolithium polymerization initiator to form a polymer block A, adding isoprene to the reaction mixture to form an A-B block copolymer, and adding a polyfunctional coupling agent to the reaction mixture to convert part of the A-B block copolymer into the above branch component. The aromatic vinyl/isoprene block copolymer is useful as a hardenable pressure-sensitive adhesive.

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Inventors:

KOMATSUZAKI SHIGERU (JP)
TSUBAKI HIDEMI (JP)
MATSUBARA TETSUAKI (JP)

Application Number:

PCT/JP1997/003967

Publication Date:

May 07, 1998

Filing Date:

October 30, 1997

Export Citation:

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Assignee:

NIPPON ZEON CO (JP)
KOMATSUZAKI SHIGERU (JP)
TSUBAKI HIDEMI (JP)
MATSUBARA TETSUAKI (JP)

International Classes:

C08F297/04; C08L53/02; C09J153/02; (IPC1-7): C08F297/04; C08L53/02; C09J153/02

Foreign References:

JPH06228522A	1994-08-16
JPS6481844A	1989-03-28
JPS6389562A	1988-04-20
JPS6386745A	1988-04-18
JPH01266156A	1989-10-24
JPH06509595A	1994-10-27
JPH07238207A	1995-09-12
JPH07238206A	1995-09-12

Other References:

See also references of EP 0943636A4
None

Attorney, Agent or Firm:

Uchida, Yukio (Sunny Port Shiba 1005 5-10, Shiba 2-chom, Minato-ku Tokyo 105, JP)

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