Process for preparing polyvinyl chloride material used for extrusion molding
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United States of America Patent
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Dec 26, 1989
Grant Date -
N/A
app pub date -
Dec 6, 1988
filing date -
Jan 22, 1988
priority date (Note) -
Expired
status (Latency Note)
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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%.
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