The B. F. Goodrich Company

Sally A Kline

William S Greenlee

Philip L Kinson

Murali Rajagopalan

Charles A Daniels

Thomas C Braden

Scott Perry

Polyvinyl halide-EVOH polymer compositions exhibiting a reduced tendency to stick to metal surfaces, and in particular, to chrome surfaces are described which comprise (A) at least one vinyl halide polymer; (B) from 1 to about 40% based on the weight of the vinyl halide polymer, of at least one ethylene-vinyl alcohol copolymer; and (C) from about 0.01 to about 5 phr of at least one phenolic antioxidant of the formula ##STR1## wherein R.sub.1 is hydrogen, or a hydroxyl or an alkyl group; R.sub.2 is an alkyl, alkoxy or a carboxylic ester group; and R.sub.3 is a hydroxy or an alkyl group. An improved process for melt blending mixtures comprising vinyl halide polymers and ethylene-vinyl alcohol copolymers on metal-surfaced compounding equipment is described which comprises adding to the mixture prior to melt blending, from about 0.01 to about 5 phr of the phenolic antioxidant described above.

Vinyl halide polymer: ethylene-vinyl alcohol blends containing phenolic

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.

Polyvinyl chloride blends

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 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 injection 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, telecommunication equipment, automotive components, and numerous others.

Vinyl halide polymer compositions exhibiting reduced gas permeability are described which comprise a mixture of

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Westlake, OH, United States of America

Sally A Kline