C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
400/5122, 204/97
C09D 5/44 (2006.01) C08G 18/64 (2006.01) C09D 175/12 (2006.01)
Patent
CA 1304861
PV 33708 ABSTRACT According to this invention we provide an aqueous coating composition, suitable for application to a cathodic substrate by electrodeposition, which comprises a dispersion in an aqueous medium in the presence of an amine-ionising acid of cationic- ally stabilised particles comprising: (1) 50 to 84% by weight on the combined weight of (1), (2) & (3) of an amine-epoxide reaction product. (2) 15 to 45% by weight based on the combined weight of (1), (2) & (3) of a blocked polyisocyanate as crosslinking agent; and (3) 1 to 12% by weight based on the combined weights of (1), (2) and (3) of a highly methylolated, highly alkylated melamine-formaldehyde resin, wherein on average at least 4.0 of the reactive hydrogen atoms per triazine ring are methylolated, at least 3.5 of these methylol groups are alkylated and the alkylating group is selected from C4-10 alkyl; the resin being substantially unreactive with the amine-epoxide reaction product (1) at temperatures below 190°C.
523011
Imperial Chemical Industries Plc
Marks & Clerk
Redman Richard P.
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