Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1987-03-05
1988-10-18
Short, Patricia
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525437, 525444, 525446, 525450, 525474, C08L 6702
Patent
active
047788585
ABSTRACT:
This invention relates to a process for preparing a thermoplastic resin composition through a solid state polymerization process. The thermoplastic resin composition made in accordance with this invention is particularly suitable for use in thermoforming thin walled articles. The process of this invention specifically comprises (1) melt blending a polyethylene terephthalate prepolymer with at least one liquid crystalline polymer to produce a polyethylene terephthalate/liquid crystalline polymer blend; and (2) solid state polymerizing said polyethylene terephthalate/liquid crystalline polymer blend at a temperature within the range of about 195.degree. C. to about 255.degree. C. for a period of at least about 1 hour to produce a thermoplastic resin composition. The subject invention also deals with thermoforming such thermoplastic resin compositions into articles, such as food trays, having a crystallinity within the range of about 10% to about 40%.
REFERENCES:
patent: 4408022 (1983-10-01), Cincotta
patent: 4438236 (1984-03-01), Cogswell
patent: 4572852 (1986-02-01), Gartland
Rockhill Alvin T.
Short Patricia
The Goodyear Tire & Rubber Company
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