Films prepared from plasticized polyesters
First Claim
1. A process for preparing a film or sheet having a glass transition temperature below about 23°
- C. and a melting temperature greater than about 120°
C. comprising the steps of;
(a) preparing a polyester composition comprising (i) about 50 to about 95 weight percent of a base copolyester having a melting temperature of less than about 220°
C. and exhibiting more than about 1 percent crystallinity after annealing for 2000 minutes at a temperature of which the base copolyester has a maximum crystallization rate, and (ii) about 5 to about 50 weight percent of a plasticizer suitable for use with the base copolyester;
(b) forming the polyester composition into a film or sheet; and
(c) inducing crystallization during step (b) or after step (b).
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Abstract
A film or sheet having a glass transition temperature below about 23° C. and a melting temperature greater than about 120° C. is prepared by first preparing a polyester composition of about 50 to about 95 weight percent of a base copolyester having a melting temperature of less than about 220° C. and exhibiting more than about 1 percent crystallinity after annealing for 2000 minutes at a temperature of which the base copolyester has a maximum crystallization rate; and about 5 to about 50 weight percent of a plasticizer suitable for use with the base copolyester. The polyester composition is formed into a film or sheet. During formation of the film or sheet or afterwards, crystallization is induced to provide a soft and flexible film or sheet.
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Citations
45 Claims
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1. A process for preparing a film or sheet having a glass transition temperature below about 23°
- C. and a melting temperature greater than about 120°
C. comprising the steps of;
(a) preparing a polyester composition comprising (i) about 50 to about 95 weight percent of a base copolyester having a melting temperature of less than about 220°
C. and exhibiting more than about 1 percent crystallinity after annealing for 2000 minutes at a temperature of which the base copolyester has a maximum crystallization rate, and(ii) about 5 to about 50 weight percent of a plasticizer suitable for use with the base copolyester;
(b) forming the polyester composition into a film or sheet; and
(c) inducing crystallization during step (b) or after step (b). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- C. and a melting temperature greater than about 120°
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24. A process for preparing a film or sheet comprising the steps of:
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(a) preparing a polyester composition comprising (i) about 50 to about 80 weight percent of a base copolyester having a melting temperature of less than about 220°
C. and a glass transition temperature of greater than about 60°
C. and exhibiting more than about 1 percent crystallinity after annealing for 2000 minutes at a temperature of which the base copolyester has a maximum crystallization rate, and(ii) about 20 to about 50 weight percent of a plasticizer suitable for use with the base copolyester. (b) forming the polyester composition into a film or sheet; and
(c) inducing crystallization during step (b) or after step (b);
and wherein after step (c) the film or sheet has a glass transition temperature below about 23°
C. and a melting temperature greater than about 140°
C. - View Dependent Claims (25, 26)
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27. A film or sheet having a glass transition temperature below about 23°
- C. and a melting temperature greater than about 120°
C. and comprising a polyester composition comprising(a) about 50 to about 95 weight percent of a base copolyester having a melting temperature of less than about 220°
C. and exhibiting more than about 1 percent crystallinity after annealing for 2000 minutes at a temperature of which the base copolyester has a maximum crystallization rate and(b) about 5 to about 50 weight percent of a plasticizer suitable for use with the base copolyester. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
- C. and a melting temperature greater than about 120°
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43. A film or sheet having a glass transition temperature below about 23°
- C. and a melting temperature greater than about 140°
C. and comprising a polyester composition comprising(a) about 50 to about 80 weight percent of a base copolyester having a melting temperature of less than about 220°
C. and a glass transition temperature of greater than about 60°
C. and exhibiting more than about 1 percent crystallinity after annealing for 2000 minutes at a temperature of which the base copolyester has a maximum crystallization rate, and(b) about 20 to about 50 weight percent of a plasticizer suitable for use with the base copolyester. - View Dependent Claims (44, 45)
- C. and a melting temperature greater than about 140°
Specification