POLYVINYL CHLORIDE PIPE FOR THE INNER LINING OF EXISTING PIPES

摘要

A polyvinyl chloride 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 DPL of 400 to 600 and 60 to 40 % by weight of another polyvinyl chloride having a higher average degree of polymerization DPH 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.