Polyvinyl chloride pipe
AssigneeRohm and Haas Company
InventorsMichael T. Petr, Steven R. Rapacki
Life of this patent
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Abstract
The present invention relates to non-oriented and oriented polyvinyl chloride pipe comprising: a) polyvinyl chloride; b) from 2 to 5 parts by weight of polymeric processing aid per 100 parts by weight of the polyvinyl chloride; and c) from 1.6 to 2.0 parts by weight percent of a paraffin wax per 100 parts by weight of the polyvinyl chloride. The polyvinyl chloride pipe of the present invention comprises a concentration of paraffin wax lubricant (>1.5 parts per 100 parts polyvinyl chloride) heretofore unrecognized in the art, without the loss of key physical properties.
Claims7
A non-oriented polyvinyl chloride pipe comprising, based on the weight of the pipe:
- a) polyvinyl chloride;
- b) from 2 to 5 parts by weight of a polymeric processing aid per 100 parts by weight of the polyvinyl chloride;
- and
- c) from 1.6 to 2.0 parts by weight percent of an external lubricant per 100 parts by weight of the polyvinyl chloride;
- wherein the polyvinyl chloride has K-value in the range of 60 to 75;
- wherein the polymeric processing aid comprises from 50 to 95 weight percent structural units of methyl methacrylate and from 5 to 50 weight percent structural units of a second monomer which is a C2-C6 acrylate or a C2-C6 methacrylate or a combination thereof;
- wherein the external lubricant is a polyol ester or a paraffin wax;
- and
- wherein the processing aid has a weight average molecular weight in the range of from 5×105 Daltons to 5×107 Daltons.
An oriented polyvinyl chloride pipe comprising, based on the weight of the pipe:
- a) oriented polyvinyl chloride;
- b) from 2 to 5 parts by weight of a polymeric processing aid per 100 parts by weight of the polyvinyl chloride;
- and
- c) from 1.6 to 2.0 parts by weight percent of an external lubricant per 100 parts by weight of the polyvinyl chloride;
- wherein the polyvinyl chloride has K-value in the range of 60 to 75;
- wherein the polymeric processing aid comprises from 50 to 95 weight percent structural units of methyl methacrylate and from 5 to 50 weight percent structural units of a second monomer which is a C2-C6 acrylate or a C2-C6 methacrylate or a combination thereof;
- and
- wherein the processing aid has a weight average molecular weight in the range of 5×105 Daltons to 5×107 Daltons.
Dependencies are inferred from the claim text.