Title:
BLOCK COPOLYMER, COMPOSITION, HEAT SHRINKABLE FILM, SHEET AND MOLDING OF SHEET
Document Type and Number:
Japanese Patent JP2023084128
Kind Code:
A
Abstract:
To provide a block copolymer having a high tensile elongation value and less in gel foreign material.SOLUTION: A block copolymer has a first vinyl aromatic block (S1), a second vinyl aromatic block (S2), and a copolymer block (B/S), wherein the (S1) and (S2) are each independently substantially composed of only the vinyl aromatic monomer unit, a weight average molecular weight of (S2) is not more than (S1), and the (B/S) is substantially composed only of vinyl aromatic monomer units and conjugated diene monomer units, and a content of the conjugated diene monomer units in (B/S) is 55 mass% or more and 82 mass% or less, when a total mass of the (S1) and (S2) is 100 mass%, a ratio of the (S1) is 50 mass% or more and 85 mass% or less, and a content of the (B/S) is 38 mass% or more and 60 mass% or less.SELECTED DRAWING: None
Inventors:
NAKAMURA TOMOYA
SAWASATO TADASHI
YOSHIDA JUN
SAWASATO TADASHI
YOSHIDA JUN
Application Number:
JP2022211104A
Publication Date:
June 16, 2023
Filing Date:
December 28, 2022
Export Citation:
Assignee:
DENKA CO LTD
International Classes:
C08F297/04; C08L53/02
Attorney, Agent or Firm:
SK Patent Attorney Corporation
Akihiko Okuno
Hiroyuki Ito
Akihiko Okuno
Hiroyuki Ito