Molded composite polyester articles having improved thermal shock resistance
AssigneeReichhold Chemicals, Inc.
InventorKatari S. Raju
Life of this patent
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Abstract
A molded article such as a bathroom sink having improved thermal shock resistance is produced by molding the article from a composite unsaturated polyester resin in which the resin in the cured state has an HDT value in the range of about 68.degree. C.-78.degree. C.
Claims22
A molded article having improved thermal shock resistance of at least 600 cycles to failure in accordance with the more severe form of the ANSI Test No. Z124.3, said article molded from a composite composition consisting essentially of about 60 to 80 weight % of at least one inorganic filler selected from the group consisting of calcium carbonate, kaolin, clay, talc, alumina, aluminum trihydrate, silica, diatomaceous earth, and barium sulfate;
- and about 20 to 40 weight % of an unsaturated polyester resin, wherein the improved thermal shock resistance is directly related to the use of an unsaturated polyester resin which when cured into a clear unfilled casting, has a heat deflection temperature of about 68.degree. C. to 78.degree. C.
A process for improving the thermal shock resistance of a molded article to at least 600 cycles to failure in accordance with the more severe form of the ANSI Test No. Z124.3, by molded the article from a composite composition consisting essentially of about 60 to 80 weight % of at least one inorganic filler selected from the group consisting of calcium carbonate, kaolin, clay, talc, alumina, aluminum trihydrate, silica, diatomaceous earth, and barium sulfate;
- and about 20 to 40 weight % of an unsaturated polyester resin, wherein the improved thermal shock resistance is directly related to the use of an unsaturated polyester resin which when cured into a clear unfilled casting, has a heat deflection temperature of about 68.degree. C. to 78.degree. C.
Dependencies are inferred from the claim text.