Non-settling coating composition and flatting pigment

Details Non-settling coating composition and flatting pigment Non-settling coating composition and flatting pigment

1977-11-14

1979-05-22

Garvin, Patrick

Compositions: coating or plastic

Coating or plastic compositions

Carbohydrate or derivative containing

106288B, 106195, 428402, C08K 336

Patent

active

041557697

ABSTRACT:
A coating composition such as nitrocellulose lacquer or varnish incorporates a flatting pigment having non-settling properties obtained by grinding a dried precipitated hydrated silica and calcining it at a temperature between 400.degree. C. and 600.degree. C. so that the pigment consists of particles smaller than 10 microns in size having a bound water content below 2%. The calcination may be effected before or after the grinding. Advantageously, a wet precipitated hydrated silica is spray-dried to about 12% or less total moisture; the dried hydrated silica is milled and air classified to obtain material consisting entirely of particles smaller than 10 microns in size; and these particles are calcined at a temperature between 450.degree. C. and 550.degree. C. The pigment product so obtained exhibits outstanding non-settling flatting characteristics in nitrocellulose lacquer.

REFERENCES:
patent: 2717214 (1955-09-01), Marotta et al.
patent: 2805956 (1957-09-01), Pechukas
patent: 2838413 (1958-06-01), Young
patent: 3499778 (1970-03-01), Cain, Jr. et al.

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