Process for preparing polyvinyl chloride material used for extru

Details Process for preparing polyvinyl chloride material used for extru Process for preparing polyvinyl chloride material used for extru

1988-12-06

1989-12-26

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

With subsequent cutting, grooving, breaking, or comminuting

264122, 264143, 264211, 264349, B29B 732, B29B 906, B29C 4700

Patent

active

048896730

ABSTRACT:
Preparing process for polyvinyl chloride material used for extrusion molding suitable to high speed extrusion includes a step of dry blending a blend prepared by blending polyvinyl chloride (polymer) compounded with plasticizers stabilizers and other auxiliary materials while controlling the temperature for the blend within a range from room temperature to 165.degree. C. and a step of kneading and pelletizing the blend after the dry blending step while controlling the temperature for the blend to lower than 165.degree. C. The polyvinyl chloride used is a suspension polymerizate capable of satisfying the condition that the retention ratio on 80 mesh screen (ASTM: E11-58T) is less than 1%.

REFERENCES:
patent: 3101241 (1963-08-01), McKee, Jr.
patent: 3287480 (1966-11-01), Wechsler et al.
patent: 3562373 (1971-02-01), Logrippo
patent: 3919164 (1975-11-01), Hattori et al.
patent: 3931094 (1976-01-01), Segal et al.
patent: 4012348 (1977-03-01), Chelland et al.
patent: 4491553 (1985-01-01), Yamada et al.

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