Basf Corporation

Basf Corporation, Inmont Division

Michael C Knight

Thomas C Balch

Rodney L Briggs

Paul E Lamberty

Timothy D Salatin

Chris W Fowler

Michael D Shesterkin

Robert A Aamodt

Anthony J Nicholas

John S Van Antwerp

A method of coating an article to prevent yellowing of the clearcoat is described. The method comprises the steps of

Coating method for one-component blocked isocyanate-crosslinked clearcoat

Aqueous-based basecoat compositions, useful for application to metal and/or plastic substrates, comprise an anionic polyurethane principal resin and an anionic acrylic pigment grind resin. The compositions are particularly adapted to application to substrates over a wide range of ambient humidities and have quick drying characteristics. The incorporation of an anionic acrylic grind resin, which is compatible with the anionic polyurethane principal resin, produces a coating which has good pigment wetting and dispersion characteristics with improved shelf life and color stability.

Aqueous-based coating compositions comprising anionic polyurethane

This invention, therefore, relates to the field of polyurethane coatings for use in automobile basecoat/clearcoat systems. In particular, this invention relates to the discovery that incorporating a long-chain carboxylic acid of at least 50% by weight of the carboxylic acid component used to make polyester resins which are further incorporated into polyurethane resins provides basecoat composition exhibiting low temperature flash characteristics. These low temperature flash characteristics are exhibited even where the basecoat is deposited at 50-90% relative humidity.

Polyurethane resins in water-dilutable basecoats having low flash and

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Centerline, MI, United States of America

Michael C Knight