Styrene-based/polymercaptan polymer and process for production thereof
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United States of America Patent
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Apr 17, 1990
Grant Date -
N/A
app pub date -
Aug 29, 1988
filing date -
Sep 24, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Novel styrene-based polymers and a process for efficient production thereof are disclosed. The styrene-based polymers have a branching nucleus represented by the general formula: R(S).sub.k or R(A-S).sub.k (wherein all the symbols are as defined in the appended claims), and have a sulfur content of 6 to 550 ppm, a weight average molecular weight of 450,000 to 1,300,000, and a weight average molecular weight/number average molecular weight (Mw/Mn) ratio of 2:1 to 15:1. The styrene-based polymers are greatly improved in impact resistance while maintaining sufficiently high fluidity and moldability and thus when injection or extrusion molded, can provide moldings having an excellent mechanical strength.
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