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AssigneeThe B. F. Goodrich Company
InventorsWilliam S. Greenlee, Philip L. Kinson, Sally A. Kline, Murali Rajagopalan, Charles A. Daniels
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Blend compositions are provided comprising first polyvinyl chloride and a second polyvinyl chloride wherein the inherent viscosity (I.V.) of the second polyvinyl chloride, measured in accordance with ASTM1243 is at least about 0.2 units higher than the I.V. of the first polyvinyl chloride. Preferably the I.V. of the second polyvinyl chloride is from 0.2 to 1.0 units higher than the I.V. of said first polyvinyl chloride, with the most preferred difference in I.V. (.DELTA.I.V.) being 0.35 to 0.65 units so as to yield a balance of property improvements including impact resistance, heat distortion temperature, melt flow and melt viscosity. The higher I.V. PVC is present at from 0.1 to less than 20 weight percent of the total PVC content. The compositions also can further comprise melt flow enhancers and/or Tg enhancing agents. The blends of the present invention are processible by a variety of techniques including molding, extrusion, calendering, thermoforming, compression molding and the like to form useful articles such as molded sheets, trays, shrouds as for fans, appliance parts and covers, electrical outlets, business machine housings, piping, telecommunication equipment, automotive components, and numerous others.
A rigid blend composition comprising a first uncrosslinked polyvinyl chloride polymer (PVC) having an inherent viscosity measured per ASTM-D1243 (I.V.) of from about 0.20 to about 1.0, from 0.1 to less than 20 phr weight parts per 100 weight parts combined polyvinyl chloride of a second uncrosslinked polyvinyl chloride polymer having an inherent viscosity of from 0.6 to about 1.05, a polymeric impact modifier, and from 0 to 10 phr of a plasticizer, wherein the inherent viscosity for said second polyvinyl chloride must be form 0.2 to 0.85 inherent viscosity units higher (.DELTA.I.V.) than said inherent viscosity for said first polyvinyl chloride.
A rigid article comprising from about 80 to about 99 parts by weight of a first polyvinyl chloride polymer having an inherent viscosity measured per ASTM-D1243 of from about 0.2 to about 1.0 in combination with from about 1 to less than 20 parts by weight of a second polyvinyl chloride polymer having an inherent viscosity of from about 0.6 to about 1.05, from 0 to 10 parts by weight of a plasticizer, at least one stabilizer and at least one polymeric impact modifier, wherein said inherent viscosity for said second polyvinyl chloride must be from 0.2 to 0.85 units higher than said inherent viscosity for said first polyvinyl chloride.
An article comprising from about 80 to about 99 parts by weight of a first polyvinyl chloride (PVC) polymer having an inherent viscosity measured per ASTM-D1243 of from about 0.3 to about 0.7 in combination with from about 1 to less than 20 parts by weight of a second polyvinyl chloride polymer having inherent viscosity of from about 0.6 to about 1.05, at least one stabilizer, at least one polymeric impact modifier, and from 0 to 10 weight parts of a plasticizer, wherein said inherent viscosity for said second polyvinyl chloride must be from 0.2 to 0.85 units higher than said inherent viscosity for said first polyvinyl chloride.
A process for obtaining a PVC compound having an improved balance of impact resistance, heat deflection temperature, melt viscosity and melt flow rate comprising the steps of:
Dependencies are inferred from the claim text.