Use of calcium carbonate in rigid poly(vinyl chloride)...

Details Use of calcium carbonate in rigid poly(vinyl chloride)... Use of calcium carbonate in rigid poly(vinyl chloride)...

2007-07-03

2007-07-03

Wu, David W. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C524S180000, C524S269000, C524S515000, C524S567000

Reexamination Certificate

active

10506661

ABSTRACT:
Poly(vinyl chloride) is compounded with a chalk-like, essentially pure calcium carbonate to provide improved weathering resistance of rigid poly(vinyl chloride) articles subjected to external exposures of heat and sunlight. Blends and alloys are also disclosed. Optionally, one can add either zinc alkyl ester scavenger, organotin stabilizer, or both to further improve the effectiveness of the essentially pure calcium carbonate.

REFERENCES:
patent: 3476627 (1969-11-01), Squires
patent: 4213487 (1980-07-01), Funk et al.
patent: 4711921 (1987-12-01), Lehr
patent: 4977193 (1990-12-01), Croce et al.
patent: 5100946 (1992-03-01), Hung et al.
patent: 5102465 (1992-04-01), Lamond
patent: 5880177 (1999-03-01), Higgs et al.
patent: 5948492 (1999-09-01), Cargile
patent: 1564087 (1980-04-01), None
Derwent Abstract for JP 03 195754A (1991).
Derwent Abstract for JP 08 188652A (1996).
J. of Vinyl Technology, vol. 5, No. 3, pp. 91-95 (1983).

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