Pigment composition and preparation process thereof

Details Pigment composition and preparation process thereof Pigment composition and preparation process thereof

1986-06-02

1987-12-15

Lieberman, Paul

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...

106288Q, 106309, 524562, C08J 304

Patent

active

047134119

ABSTRACT:
A pigment composition is composed of an intimate mixture of an organic pigment and a polymer. The content of the organic pigment is 75-95 wt. % based on the whole pigment composition. Monomers which form the polymer include 0-40 wt. % of styrene, 20-70 wt. % of a methacrylic ester and 20-50 wt. % of methacrylic acid. The total proportion of styrene, the methacrylic ester and methacrylic acid is at least 85 wt. % of the entire monomers. The pigment composition is prepared by mixing the organic pigment with an aqueous alkaline solution, which contains the polymer and an alkali metal salt, alkali metal hydroxide, lower amine or ammonium, to form an aqueous dispersion. The organic pigment and polymer are then subjected to coprecipitation, preferably, by lowering the pH of the aqueous dispersion beyond 7.0.

REFERENCES:
patent: 4049610 (1977-09-01), Bunge et al.
patent: 4089699 (1978-05-01), Blackburn et al.
patent: 4107126 (1978-08-01), Burke, Jr.
patent: 4317682 (1982-03-01), Katsura et al.
patent: 4521494 (1985-06-01), Mani
patent: 4613648 (1986-09-01), Usala
patent: 4639394 (1987-01-01), Das et al.
patent: 4663384 (1987-05-01), Penzel et al.

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