Polyeste blends with improved stress whitening for film and sheet applications
First Claim
1. A polyester blend comprising:
- (a) a polyester, wherein said polyester is a random copolymer having a crystallization half-time from a molten state of at least 5 minutes; and
(b) one or more polyester elastomers comprising;
(i) diacid residues comprising the residues of one or more substituted or unsubstituted cycloaliphatic dicarboxylic acids containing 5 to 20 carbon atoms; and
(ii) diol residues comprising the residues of one or more substituted or unsubstituted, linear or branched, diols selected from the group consisting of aliphatic diols containing 2 to 20 carbon atoms, poly(oxyalkylene)-glycols and copoly(oxyalkylene)glycols of molecular weight of about 400 to about 12000, cycloaliphatic diols containing 5 to 20 carbon atoms, and aromatic diols containing 6 to 20 carbon atoms.
1 Assignment
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Accused Products
Abstract
Disclosed are polyester blends that provide improved stress whitening behavior. The blends may be prepared from a polyester having crystallization half-time of at least 5 minutes and a polyester elastomer. The polyesters blends may be extruded or, in the presence of a release additive, calendered to produce film or sheet. Also disclosed are processes for making a film or sheet by extrusion or calendering the above blends and the film or sheet produced therefrom. The polyester blend and the film or sheet produced therefrom also may include plasticizers and/or flame retardants to increase their flexibility and enable their use in commercial applications requiring flame resistance. The film and sheet have excellent appearance and can be used in a wide range of decorative and packaging applications.
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Citations
16 Claims
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1. A polyester blend comprising:
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(a) a polyester, wherein said polyester is a random copolymer having a crystallization half-time from a molten state of at least 5 minutes; and (b) one or more polyester elastomers comprising; (i) diacid residues comprising the residues of one or more substituted or unsubstituted cycloaliphatic dicarboxylic acids containing 5 to 20 carbon atoms; and (ii) diol residues comprising the residues of one or more substituted or unsubstituted, linear or branched, diols selected from the group consisting of aliphatic diols containing 2 to 20 carbon atoms, poly(oxyalkylene)-glycols and copoly(oxyalkylene)glycols of molecular weight of about 400 to about 12000, cycloaliphatic diols containing 5 to 20 carbon atoms, and aromatic diols containing 6 to 20 carbon atoms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification