C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
117/198, 400/400
C09D 5/08 (2006.01) C08K 3/08 (2006.01) C08K 3/22 (2006.01) C08K 3/24 (2006.01) C08L 63/00 (2006.01) C09D 5/10 (2006.01) C09D 163/00 (2006.01)
Patent
CA 1333830
This invention relates to aqueous epoxy resin- containing compositions and to such compositions which are particularly useful for depositing coatings on metal- lic substrates in order to protect substrates against corrosion. The aqueous compositions generally comprise (A) an organic resin component consisting essentially of at least one water-dispersible or emulsifiable epoxy resin or a mixture of resins containing more than 50% by weight of at least one water-dispersible or emulsifiable epoxy resin, (B) chromium trioxide, and (C) water, said composition further characterized as being substantially free of strontium chromate. The aqueous compositions may also contain other ingredients including zinc and/or ferro alloys. These aqueous compositions are useful as pre- treatment coatings on metal surfaces, and in particular, on steel and on galvanized and aluminized metal sub- strates. This pretreatment coating can then be coated with weldable or non-weldable primer coatings followed by the application of decorative topcoats such as appliance topcoats or automotive topcoats. The inven- tion also relates to metal substrates which have been coated with the pretreatment coating and, optionally, the weldable or non-weldable primer coatings.
566390
Anderson Karl P.
Clark Whaite M.
Moyle Richard T.
Yu Poli C.
Basf Corporation
Macrae & Co.
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