Weatherable vinyl polymer compositions
AssigneeThe B. F. Goodrich Company
InventorsEmilia E. Lacatus, Elvira B. Rabinovitch, James W. Summers
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Abstract
The invention relates to a vinyl halide polymer composition suitable for outdoor use in the sunlight. The change in color as measured by .DELTA.E in articles made from the polymeric composition is found to be substantially lower than other compositions. The lower .DELTA.E provides a measurement for improved weatherability of the compositions in such applications as housing siding, window profiles, shutters and roof vents.
Claims14
A vinyl halide polymer composition substantially free of TiO.sub.2 comprising:
- (a) 100 parts by weight of vinyl halide polymer;
- (b) from about 1.0 to about 5.0 parts by weight of tin carboxylate stabilizer having the formula ##STR2## where R is an alkyl, X is an integer of 1 or 2, R' is selected from the group consisting of an alkyl having from about 8 to about 30 carbon atoms and an aryl;
- (c) a coloring amount of brown infrared reflecting pigment;
- (d) a sulfur containing tin stabilizer in an amount less than about 1.0 part by weight;
- (e) less than 0.5 part by weight of calcium stearate;
- wherein said composition has a .DELTA.E color change upon QUV accelerated weathering tester for 350 hours of less than about 4.0, a .DELTA.E less than about 8.0 after 700 hours exposure and a .DELTA.E less than about 12.0 after 1050 hours exposure;
- and wherein said composition has a dynamic heat stability greater than about 10.0 minutes.
A process for producing a weatherable mass tone vinyl halide polymer composition comprising mixing:
- (a) 100 parts by weight of vinyl halide polymer;
- (b) from about 1.0 to about 5.0 parts by weight of tin carboxylate stabilizer having the formula ##STR3## where R is an alkyl, X is an integer of 1 or 2, R' is selected from the group consisting of an alkyl having from about 8 to about 30 carbon atoms and an aryl;
- (c) a coloring amount of brown infrared reflecting pigment;
- (d) a sulfur containing tin stabilizer in an amount less than about 1.0 part by weight.
Dependencies are inferred from the claim text.