Method of producing sheet made of a low-viscosity polyester resi

Details Method of producing sheet made of a low-viscosity polyester resi Method of producing sheet made of a low-viscosity polyester resi

1991-06-06

1993-01-05

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

264 37, 2642102, 26421123, 264553, 264571, 2642884, 264322, 264DIG69, 425203, B29C 5110

Patent

active

051768615

ABSTRACT:
Polyester sheets are produced by melting a low-viscosity polyester such as a recovered polyester under reduced pressure, extruding the melt into a sheet, and stretching the sheet in the direction of width by 2.5 to 120%. The polyester resin of the oriented sheet thus obtained has an intrinsic viscosity of 0.40 to 0.63. Polyester sheets can be produced readily and continuously from recovered polyester resins or polyester resins below standards, which have a low intrinsic viscosity, and the cost of production of polyester sheets is reduced. These sheets can be formed into various shaped articles by vacuum forming, pressure forming or the like without occurrence of draw-down and without giving defective shaped articles.

REFERENCES:
patent: 3795468 (1974-03-01), Hester et al.
patent: 4162880 (1979-07-01), Cobbs et al.
patent: 4238443 (1980-12-01), Levy
patent: 4272475 (1981-06-01), Chi
patent: 4617164 (1986-10-01), Kanesaki et al.
patent: 4863652 (1989-09-01), Chang

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