Calcium sulfate as a partial replacement for titanium dioxide in

Details Calcium sulfate as a partial replacement for titanium dioxide in Calcium sulfate as a partial replacement for titanium dioxide in

1990-07-24

1992-06-23

Michl, Paul R.

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...

524423, 152524, 152DIG12, C08K 322

Patent

active

051243903

ABSTRACT:
The invention relates to a whitened polymeric blend composition in which the whiteness is achieved by the substitution of from about 0 to about 20 parts per hundred rubber of calcium sulfate for from about 0 to about 20 parts per hundred rubber of titanium dioxide by volume. The invention allows for a reduction of up to 20 percent of the titanium dioxide, while maintaining a brightness of at least 85 as measured on the L scale of the Minolta Chroma Meter test.

REFERENCES:
patent: 3392139 (1968-07-01), Dingman
patent: 3873321 (1975-03-01), Tatusta et al.
patent: 4195996 (1980-04-01), Nakajima et al.
patent: 4425452 (1984-01-01), Nakata et al.
patent: 4684420 (1987-08-01), Bryant et al.
patent: 4911218 (1990-03-01), Patitsas
Hawley, Condensed Chemical Dictionary 1987, p. 209 CaSO.sub.4 Definition; p. 1109 TiO.sub.2 Def.
Hawley, Condensed Chemical Dictionary 1987, p. 209 CaSO.sub.4 Def.; p. 1159 TiO.sub.2 Def.

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