Thermoplastic resin compositions having improved performance
AssigneeNOVA Chemicals Inc.
InventorJay S. Rosenthal
Life of this patent
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Abstract
A heat resistant polymer such as a styrene maleic anhydride copolymer which has been contaminated with a minor amount of a vinyl chloride polymer such as polyvinyl chloride may be stabilized sufficiently by incorporation of calcium carbonate to allow contaminated heat resistant polymer reclaimed in this manner to match the performance of non-contaminated heat resistant polymer. Instrument panels comprising such heat resistant polymers and polyvinyl chloride polymers may thus be readily recycled and reused to form new molded articles exhibiting with little or no deterioration in properties.
Claims15
A composition consisting essentially of:
- (a) 100 parts by weight of a thermoplastic resin comprised of a heat resistant polymer selected from the group consisting of (i) polyphenylene oxides, (ii) random styrenic copolymers comprised of, in polymerized form, 50 to 99 weight percent of a vinyl aromatic monomer, 1 to 30 weight percent of an unsaturated dicarboxylic acid derivative and 0 to 40 weight percent of a copolymerizable ethylenically unsaturated monomer, (iii) aromatic polycarbonates, (iv) styrene acrylonitrile copolymers, (v) acrylonitrile-butadiene-styrene polymers, and (vi) mixtures thereof, wherein at least a portion of said thermoplastic resin has been reclaimed;
- (b) from 0.01 to 5 parts by weight of a vinyl resin comprised of a vinyl chloride polymer;
- and
- (c) from 0.01 to 5 parts by weight of calcium carbonate, wherein calcium carbonate is present at a level at least equivalent to the concentration of vinyl resin in the composition.
A method of enhancing the performance of a reclaimed thermoplastic resin contaminated with from 0.01 to 5 parts by weight thermoplastic resin, of a vinyl resin comprised of a vinyl chloride polymer, wherein the thermoplastic resin is comprised of a heat resistant polymer selected from the group consisting of (i) polyphenylene oxides, (ii) random styrenic copolymers comprised of, in polymerized form, 50 to 99 weight percent of a vinyl aromatic monomer, 1 to 30 weight percent of an unsaturated dicarboxylic acid derivative, and 0 to 40 weight percent of a copolymerizable ethylenically unsaturated monomer, (iii) aromatic polycarbonates, (iv) styrene-acrylonitrile copolymers, (v) acrylonitrile-butadiene-styrene polymers, and (vi) mixtures thereof;
- said method comprising incorporating 0.01 to 5 parts by weight calcium carbonate per 100 parts by weight of the reclaimed thermoplastic resin into said reclaimed thermoplastic resin wherein calcium carbonate is present at a level at least equivalent to the concentration of vinyl resin.
Dependencies are inferred from the claim text.