Polyvinyl chloride pipe for the inner lining of existing pipes
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United States of America Patent
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-
Sep 15, 1992
Grant Date -
N/A
app pub date -
Mar 18, 1991
filing date -
Mar 26, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A polyvinyl choride resin pipe serves as an inner lining material for the existing pipes. The resin pipe is formed of a resin composition which comprises as a main component either a polyvinyl chloride having a degree of polymerization DP of 600 to 1,050, or a mixture of 40 to 60% by weight of a polyvinyl chloride having a lower average degree of polymerization DP.sub.L of 400 to 600 and 60 to 40% by weight of another polyvinyl chloride having a higher average degree of polymerization DP.sub.H of 1,050 to 1,350. The resin composition further comprises 3 to 25 parts by weight of a modifying agent blended with 100 parts by weight of the main component. The modifying agent is composed of MMA- and/or MBS-modifiers.
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