Block copolymer, its composition and film made of it
US7189462B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2004 |
| Grant date | Mar 13, 2007 |
| Priority date | — |
| Expiry date | Nov 19, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31931
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.