Novel pigment grinding vehicles
AssigneePPG Industries, Inc.
InventorsLance C. Sturni, Joseph F. Bosso
Life of this patent
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Abstract
It has been found that quaternary onium (e.g., ammonium, sulfonium, and phosphonium) salt group-containing epoxy resins are particularly useful as grinding media in preparing stable pigment disperions useful in water-dispersible coating systems, for example, electrodepositable compositions. The resins are prepared by reacting a material selected from the group consisting of amine salts, phosphine-acid mixtures, and sulfide-acid mixtures with a 1,2-epoxy group containing material wherein a ratio of at least about 0.4 eqivalents of quaternary onium groups are produced per equivalent of epoxy group initially present. Preferably, the system contains at least a small amount of polyoxyalkylene glycol.
Claims6
A stable aqueous pigment paste comprising:
- A. 2 to 50 percent by weight based on weight of (B) of a water-dispersible cationic polymer produced by reacting a 1,2-epoxy group-containing material with a material selected from the group consisting of amine salts, phosphine-acid mixtures and sulfide-acid mixtures, said cationic polymer having a ratio of final quaternary onium salt groups to initial epoxide groups greater than about 0.4 to 1;
- and
- B. a pigment dispersed therein.
Dependencies are inferred from the claim text.