Patent · US Expired

Biaxially oriented film made from cycloolefinic polymers, its use, and process for its production

US6017616A · kind A · utility

7Cited by

7References

29Claims

0Family size

Assignees

Ticona LLC · US
MITSUI & CO., LTD. · JP

Inventors

Karl-Heinz Kochem · Neunkirchen, DE
Wolfgang Rasp · Prien am Chiemsee, DE
Herbert Peiffer · Mainz, DE
Wilfried Hatke · Hofheim, DE

Key dates

Filing date	Nov 19, 1997
Grant date	Jan 25, 2000
Priority date	—
Expiry date	Nov 19, 2017

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31909
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a film having more than one layer and made from cycloolefin polymers and having a base layer and at least one outer layer, the base layer being built up essentially from a cycloolefin polymer COP having a glass transition temperature Tg and the outer layer being built up essentially from a mixture of cycloolefin polymers, wherein the mixture of cycloolefin polymers comprises at least two cycloolefin polymers COP.sub.1 and COP.sub.2 whose glass transition temperatures Tg.sub.1 and Tg.sub.2 differ by at least 5.degree. C., where Tg.sub.2 -Tg.sub.1 .gtoreq.5.degree. C. and at the same time the condition Tg.sub.2 -Tg.gtoreq.5.degree. C. is fulfilled.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.