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US 5,703,134 AGranted
Copolymers of recycled polyester
AssigneeMonsanto Company
InventorsJawed Asrar, A. Hameed Bhombal
Life of this patent
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Abstract
New copolymers of recycled polyesters having improved properties are disclosed. The copolyesters are produced by a reaction of recycled polyalkylene terephthalate and a dicarboxylate moiety.
Claims4
A process for producing a copolyester of recycled polyethylene terephthalate and a dicarboxylate moiety comprising:
- a) heating unmodified recycled polyethylene terephthalate and a dicarboxylate moiety in a reactor to a temperature within the range of from about 273.degree. C. to about 293.degree. C. for a period of from about 1 hour to about 3 hours;
- and
- b) reducing the pressure to a pressure of from about 0.5 to about 1.0 mm mercury.
Dependencies are inferred from the claim text.