US 2005/0089702 A1 · Block copolymer, its composition and film made of it

Abstract

It is to provide a block copolymer and its copolymer composition which provides a heat shrinkable (multilayer) film with less spontaneous shrinkage while maintaining favorable low temperature shrinkability, and a heat shrinkable (multilayer) film containing the block copolymer. By using a block copolymer comprising a vinyl aromatic hydrocarbon and a conjugated diene characterized in that the relation of the loss tangent value obtained by dynamic viscoelasticity measurement with the temperature satisfies specific conditions, or a composition containing the copolymer composition as an essential component, a heat shrinkable (multilayer) film with less spontaneous shrinkability and less odor while maintaining favorable low temperature shrinkability can be obtained.

Claims33

Dependent claims

A block copolymer (A) comprising a vinyl aromatic hydrocarbon and a conjugated diene, wherein the relation of the loss tangent value obtained by dynamic viscoelasticity measurement to the temperature satisfies the following conditions:

(1) there is at least one maximum value within a temperature range of from 60 to 110° C.,
(2) the value of loss tangent at a temperature lower by 10° C. than the lowest temperature for the maximum value is at most 40% of the highest maximum value, and
(3) the value of loss tangent at a temperature lower by 30° C. than the lowest temperature is at most 10% of the highest maximum value.

Dependencies are inferred from the claim text.

Facts

Application

10/991,550Filed 19 Nov 2004

Priority

JP 2000-34313910 Nov 2000

Published

28 Apr 2005

Term ends

Not estimatedThe source records don’t support an estimate.

Classification21 codes

B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 27/32
Layered products comprising a layer of synthetic resin: comprising polyolefins
C08F 297/04
Using a catalyst of the anionic type: polymerising vinyl aromatic monomers and conjugated dienes
C08J 5/18
Manufacture of articles or shaped materials containing macromolecular substances: manufacture of films or sheets

Family

Application10/415,662Continuation · filed 8 May 2003

Application10/991,550Continuation · filed 19 Nov 2004

US 2004/0102576 A1Published application

US 6,841,261 B2Related patent

US 7,189,462 B2Related patent

US 2005/0089702 A1This patent

From the US filing history. Foreign family members aren’t listed.

Block copolymer, its composition and film made of it

Life of this patent

Block copolymer, its composition and film made of it

Life of this patent

Abstract

Claims33