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US 10,329,393 B2Granted
Copolysters 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.
Claims19
A single-layer 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 diol component comprising residues of a diol having 2 to 8 carbon atoms;
- and
- (ii) a diacid component comprising residues of a dicarboxylic acid having 4 to 12 carbon atoms,
- wherein the shrink film has a glass transition temperature of from 50 to 90° C.,
- wherein the shrink film has a thickness of 25 to 75 micrometers, and
- wherein the shrink film has a shrinkage of 30 to 80% in the transverse direction when submerged in a 95° C. water bath for 10 seconds.
7 more elements
A method of making a single-layer shrink film, the method comprising:
- (I) preparing a mixture 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,
- (II) forming a film from the mixture;
- and
- (III) stretching the film to form a shrink film having a thickness of 25 to 75 micrometers,
- wherein the polyester plasticizer comprises:
- (i) a diol component comprising residues of a diol 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 shrinkage of 30 to 80% in the transverse direction when submerged in a 95° C. water bath for 10 seconds.
9 more elements
A shrink film 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) a polyester plasticizer having a weight-average molecular weight (Mw) of 900 to 12,000 g/mol,
- wherein the polyester plasticizer comprises:
- (i) a diol component comprising residues of a diol having 2 to 8 carbon atoms;
- and
- (ii) a diacid component comprising residues of a dicarboxylic acid having 4 to 12 carbon atoms,
- wherein the shrink film has a thickness of 25 to 75 micrometers,
- wherein the shrink film has a glass transition temperature of from 50 to 90° C., and
- wherein the shrink film has a shrinkage of 30 to 80% in the transverse direction when submerged in a 95° C. water bath for 10 seconds.
7 more elements
Dependencies are inferred from the claim text.