Polyvinyl chloride blend
OwnerJohn DAVIDSAVERinventor
Life of this patent
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Abstract
A process and polyvinyl chloride composition which results from the process whereby a simultaneous improvement in two physical properties is achieved, namely an increase in heat distortion temperature with decrease in coefficient of expansion, effected through the blending of a copolymer derived from a vinylaromatic monomer, preferably alpha-methyl styrene and derived from an ethylenically unsaturated cyano monomer, preferably acrylonitrile with less than 20% wood flour.
Claims18
A polyvinyl chloride blend comprising:
- about 1-20 weight percent of a copolymer comprising
- a polymer derived from a vinylaromatic monomer and
- a polymer derived from an ethylenically unsaturated cyano monomer;
- about 1-20 weight percent of wood flour;
- and
- wherein said combination of said copolymer and said wood flour when blended into said polyvinyl chloride have a coefficient of expansion less than or equal to 2.8×10-5 inch/inch/° F. and a heat distortion temperature of at least 180° F.
A polyvinyl chloride blend comprising:
- about 10-20 weight percent of a styrene-co-acrylonitrile copolymer;
- about 10-20 weight percent of wood flour;
- and
- wherein said combination of said copolymer and said wood flour when blended into said polyvinyl chloride have a coefficient of expansion less than or equal to 2.7×10-5 inch/inch/° F. and a heat distortion temperature of at least 190° F.
A polyvinyl chloride blend comprising:
- about 10-20 weight percent of alpha-methylstyrene acrylonitrile copolymer;
- about 10-20 weight percent of wood flour;
- and
- wherein said combination of said alpha-methylstyrene-co-acrylonitrile copolymer and said wood flour when blended into said polyvinyl chloride have a coefficient of expansion less than or equal to 2.5×10-5 inch/inch/° F. and a heat distortion temperature of at least 190° F.
A process for simultaneously increasing the heat distortion temperature and lowering the coefficient of thermal expansion of a polyvinyl chloride blend which comprises the steps of:
- adding about 1-20 weight percent of a copolymer comprising
- a polymer derived from a vinylaromatic monomer and
- a polymer derived from an ethylenically unsaturated cyano monomer;
- adding about 1-20 weight percent of wood flour;
- and
- wherein said combination of said copolymer and said wood flour when blended into said polyvinyl chloride have a coefficient of expansion less than or equal to 2.8×10−5 inch/inch/° F. and a heat distortion temperature of at least 180° F.
A process for simultaneously increasing the heat distortion temperature and lowering the coefficient of thermal expansion of a polyvinyl chloride blend which comprises the steps of:
- adding about 10-20 weight percent of a styrene-co-acrylonitrile copolymer;
- adding about 10-20 weight percent of wood flour;
- and
- wherein said combination of said copolymer and said wood flour when blended into said polyvinyl chloride have a coefficient of expansion less than or equal to 2.7×10−5 inch/inch/° F. and a heat distortion temperature of at least 190° F.
A process for simultaneously increasing the heat distortion temperature and lowering the coefficient of thermal expansion of a polyvinyl chloride blend which comprises the steps of:
- adding about 10-20 weight percent of alpha-methylstyrene acrylonitrile copolymer;
- adding about 10-20 weight percent of wood flour;
- and
- wherein said combination of said alpha-methylstyrene-co-acrylonitrile copolymer and said wood flour when blended into said polyvinyl chloride have a coefficient of expansion less than or equal to 2.5×10−5 inch/inch/° F. and a heat distortion temperature of at least 190° F.
Dependencies are inferred from the claim text.