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US 5,182,307 AGranted
Polyethylene terephthalate foams with integral crystalline skins
AssigneeThe Board of Regents of the University of Washington
InventorVipin Kumar
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Abstract
Polyethylene terephthalate composite structures having integral crystalline skins on a foam of polyethylene terephthalate are described. The structures exhibit enhanced physical properties compared to polyethylene terephthalate foams. The structures are produced by a method that crystallizes a portion of the polyethylene terephthalate before foaming the uncrystallized portions of the structure.
Claims6
An article of polyethylene terephthalate comprising:
- polyethylene terephthalate foam;
- and
- an integral layer of crystallized polyethylene terephthalate having a weight percent crystallinity of at least about 19 percent.
Dependencies are inferred from the claim text.