Water-dilutable coating compositions

Details Water-dilutable coating compositions Water-dilutable coating compositions

C - Chemistry, Metallurgy

09

C

6/196

C09C 1/64 (2006.01) C09D 5/02 (2006.01) C09D 5/38 (2006.01)

Patent

CA 1300819

PAT 86 100 27293-9 ABSTRACT OF THE DISCLOSURE The invention relates to water-dilutable coating compositions which contain a binder, an aluminum pigment and an aqueous diluent. The water-dilutable coating compositions according to the invention are distinguished in that they contain, as the aluminum pigment, a pigment which has been obtained by passivating a lubricant-containing aluminum pigment in an aqueous passivating solution which contains chromic acid and a water- soluble glycol ether of the general formula R1-(-0-CHR2-CH2-)n- OH in which R1 represents a lower alkyl radical, R2 represents either an H atom or a lower alkyl radical, preferably a -CH3 group, and n represents a number from 1 to 5) and/or a water- soluble glycol of the general formula HO-(CHR3-CH2-0-)nH in which R3 represents either an H atom or a lower alkyl radical, preferably a -CH3 group, and n represents a number from 1 to 5, at not less than 50°C, preferably 60 to 90°C, particularly pre- ferably about 80°C. The preferred glycol ether is 2 . n . butoxyeth- anol, and the preferred pigment lubricant is a fatty amine. These pigments generate minimal hydrogen gas on storage and are compatible with conventional water dilutable binders.

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