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EP0069394A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Manufacture of resin extended pigments

Assignee: Novartis AG
•
Filing: 1982-07-07
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Granted: —
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Expires: 2002-07-07
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Abstract

Abstract A process is disclosed for preparing resin extended pigments containing from 10% to 75% and preferably 25% to 50% by weight, based on the amount of pigment and resin present. The crude pigment and resin are premilled dry, such as in a ball mill, in a manner equivalent to that used to prepare small particle size highly aggregated pigment. Following premilling the pigment and resin are milled in an organic liquid capable of ripening the pigment particles to pigmentary size or simply improving their crystallinity which organic liquid at 30°C can dissolve no more than 5 g/l and preferably no more than 2 g/l of the resin.

Inventors

  • 👤 Edward Ephraim Jaffe

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-01 19:24
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0022; C09B67/006

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 95 words
A process comprising dry premilling an organic pigment followed by further milling the premilled pigment and from 10 to 75 percent by weight, based on the amount of pigment and resin present of a thermoplastic resin in an organic liquid in which said resin is soluble to an extent of less than 5 g per liter at 30°C and which wets the surface of the pigment particles and can improve their crystallinity while maintaining said pigment and said resin in a finely divided solid state, and recovering a resin extended pigment of pigmentary particle size.
Claim 2
Dependent Claim 95 words
A process comprising dry premilling an organic pigment followed by further milling the premilled pigment and from 10 to 75 percent by weight, based on the amount of pigment and resin present of a thermoplastic resin in an organic liquid in which said resin is soluble to an extent of less than 5 g per liter at 30°C and which wets the surface of the pigment particles and can improve their crystallinity while maintaining said pigment and said resin in a finely divided solid state, and recovering a resin extended pigment of pigmentary particle size.
Claim 3
Dependent Claim 37 words
The process of Claim 1 wherein the pigment is quinacridone or a derivative thereof or a solid solution of two or more quinacridones or quinacridone derivatives or copper phthalocyanine, or a partially or completely halogenated copper phthalocyanine.
Claim 4
Dependent Claim 39 words
The process of Claim 2 wherein the resin is a polymer of ethylene containing up to 25 weight percent of a monomer selected from the class consisting of acrylic acid, methacrylic acid, vinyl acetate and oxidized ethylene monomer units.
Claim 5
Dependent Claim 14 words
The process of Claim 3 wherein the resin is present in the premilling step.
Claim 6
Dependent Claim 32 words
The process of Claim 4 wherein the pigment at the beginning of the premilling operation is a crude pigment and the resin is comilled with the pigment for at least one hour.
Claim 7
Dependent Claim 31 words
The process of Claim 5 wherein the amount of resin is about 25 percent by weight to about 50 percent by weight, based on the amount of pigment and resin present.
Claim 8
Dependent Claim 15 words
The process of Claim 6 wherein the comilling is done at a temperature below 65°C.
Claim 9
Dependent Claim 22 words
The process of Claim 7 wherein the resin has a softening point of from 80° to 140°C as determined by ASTM E-28.

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