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US 10,329,395 B2Granted
Copolyesters plasticized with polymeric plasticizer for shrink film applications
AssigneeEastman Chemical Company
InventorsWayne Ken Shih, Kimberley Carmenia Carico, Nancy Ellen Kinkade
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Abstract
Disclosed is a shrink film containing a copolyester having a minimum crystallization half-time of at least 8.6 minutes and a polyester plasticizer having a weight-average molecular weight of 900 to 12,000 g/mol. The polyester plasticizer includes (i) a polyol component comprising residues of a polyol having 2 to 8 carbon atoms, and (ii) a diacid component comprising residues of a dicarboxylic acid having 4 to 12 carbon atoms.
Claims13
A shrink film comprising:
- (a) a copolyester having a minimum crystallization half-time (t1/2 min) of at least 8.6 minutes;
- and
- (b) a polyester plasticizer having a weight-average molecular weight (Mw) of 900 to 12,000 g/mol,
- wherein the polyester plasticizer comprises:
- (i) a polyol component comprising residues of a polyol having 2 to 8 carbon atoms;
- and
- (ii) a diacid component comprising residues of a dicarboxylic acid having 4 to 12 carbon atoms, and
- wherein the shrink film has a glass transition temperature of from 50 to 90° C.;
- wherein the shrink film comprises from 90 to 99.99 weight percent of the copolyester;
- wherein the shrink film comprises from 0.01 to 10 weight percent of the polyester plasticizer;
- and
- wherein the shrink film has a thickness of 25 to 75 micrometers.
9 more elements
A method of making a shrink film, the method comprising:
- (I) preparing a mixture comprising:
- (a) 90 to 99.99 weight percent of a copolyester having a minimum crystallization half-time (t1/2 min) of at least 8.6 minutes;
- and
- (b) 0.01 to 10 weight percent of a polyester plasticizer having a weight-average molecular weight (Mw) of 900 to 12,000 g/mol,
- (II) forming a film from the mixture;
- and
- (III) stretching the film to form a shrink film,
- wherein the polyester plasticizer comprises:
- (i) a polyol component comprising residues of a polyol having 2 to 8 carbon atoms;
- and
- (ii) a diacid component comprising residues of a dicarboxylic acid having 4 to 12 carbon atoms;
- and
- wherein the shrink film has a thickness of 25 to 75 micrometers.
10 more elements
Dependencies are inferred from the claim text.