Biaxially oriented film made from cycloolefinic polymers, its us

Details Biaxially oriented film made from cycloolefinic polymers, its us Biaxially oriented film made from cycloolefinic polymers, its us

1997-11-19

2000-01-25

Thibodeau, Paul

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

15624411, 428332, 428336, 428500, 428515, B32B 2708

Patent

active

060176164

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.

REFERENCES:
patent: 5300352 (1994-04-01), Honma
patent: 5532030 (1996-07-01), Hirose et al.
patent: 5534606 (1996-07-01), Beenett et al.
patent: 5552504 (1996-09-01), Bennett et al.
patent: 5583192 (1996-12-01), Bennett et al.
patent: 5693414 (1997-12-01), Peiffer et al.
patent: 5707728 (1998-01-01), Brekner et al.

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