Copolyester-containing plastic sheet a process for the manufactu

Details Copolyester-containing plastic sheet a process for the manufactu Copolyester-containing plastic sheet a process for the manufactu

1995-04-18

1997-08-05

Szekely, Peter A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428216, 428334, 428480, 26417312, 26417316, B32B 700, B32B 2706, B32B 2736, B32B 3130

Patent

active

056540833

ABSTRACT:
A plastic sheet including at least a core section and at least one surface layer on the core section. The core section contains a copolyester containing at least 45-50 mole % monomer units derived from a first aliphatic diol, 45-50 mole % derived from a first aromatic dicarboxylic acid, and 0.5-5 mole % monomer units derived from a second aliphatic diol and/or a second aromatic dicarboxylic acid. Each surface layer has a thickness of 2-100 .mu.m and contains the copolyester and 1-15 wt. % of a UV light-absorbing additive. The present invention excludes, however, plastic sheets having a core section and surface layer containing a copolyester that contains 50 mole % monomer units derived from terephthalic acid, 49.5-45 mole % monomer units derived from ethylene glycol, and 0.5-5 mole % monomer units derived from cyclohexane dimethanol. The plastic sheet of the present invention has a lower rate of crystallization, better surface quality and better resistance to solvents than conventional sheets.

REFERENCES:
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patent: 5108835 (1992-04-01), Hahnsen et al.
patent: 5387458 (1995-02-01), Pavelka et al.
patent: 5480926 (1996-01-01), Fagerburg et al.
Database WPI, Week 8601, Derwent Publications Ltd., London, GB.
Database WPI, Week 8723, Derwent Publications Ltd., London, GB.
Database WPI, Week 8120, Derwent Publications Ltd., London, GB.

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