Block copolymer mixture and heat shrinkable film using it

Details Block copolymer mixture and heat shrinkable film using it Block copolymer mixture and heat shrinkable film using it

2006-02-21

2008-12-30

Teskin, Fred M (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S314000, C428S034900, C428S035100, C428S220000, C428S521000

Reexamination Certificate

active

07470747

ABSTRACT:
A block copolymer mixture comprising block copolymers (A), (B) and (C) each block comprising vinyl aromatic hydrocarbon and conjugated diene monomer units:wherein block (A) comprises from 75 to 95 mass % of a vinyl aromatic hydrocarbon and from 5 to 25 mass % of a conjugated diene, and which has a block portion composed mainly of a vinyl aromatic hydrocarbon having a number average molecular weight of from 30,000 to less than 150,000:block (B) comprises from 50 to 80 mass % of a vinyl aromatic hydrocarbon and from 20 to 50 mass % of a conjugated diene, and which has a block portion composed mainly of a vinyl aromatic hydrocarbon having a number average molecular weight of from 20,000 to less than 120,000, andblock (C) comprises from 60 to 95 mass % of a vinyl aromatic hydrocarbon and from 5 to 40 mass % of a conjugated diene, which has at least one random copolymer block portion comprising, as monomer units, from 55 to 95 mass % of a vinyl aromatic hydrocarbon and from 5 to 45 mass % of a conjugated diene.

REFERENCES:
patent: 6369160 (2002-04-01), Knoll et al.
patent: 7189462 (2007-03-01), Matsui et al.
patent: 7-268175 (1995-10-01), None

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