Bayer Aktiengesellschaft

Wolfgang Schultz

Reinhard Halpaap

Hans-Ulrich Meier-Westhues

Christian Wamprecht

Hans-Josef Laas

Manfred Bock

Lothar Kahl

Hans-Joachim Kreuder

Rainer Rettig

Walter Schafer

Jurgen Meixner

Hans J Laas

Hans-Peter Klee

The present invention relates to a powder coating composition for the production of non-yellowing flexible coatings which is solid below 30.degree. C. and liquid above 120.degree. C. and contains a mixture of

Powder coating compositions and their use for coating heat-resistant

The present invention relates to a powder coating composition for the production of matte coatings, containing

Powder coating composition and its use for the preparation of matte

The present invention relates to polyaddition compounds that are solid below 40.degree. C. and liquid above 125.degree. C. and contain, based on the weight of the polyaddition compounds,

Uretdione powder coating cross-linking agents having a low melt viscosity

Polyisocyanate polyaddition products which are solid below 40.degree. C. and liquid above 125.degree. C., contain uretdione and urethane groups and have a content of at least 1 wt. % of urethane groups obtained from the reaction of dimeric diols with isocyanate groups; a method of producing the these products by the reaction of polyisocyanates containing uretdione groups with dimeric diols; and the use of these polyaddition compounds as the starting component in the manufacture of polyurethane plastics, particularly as the cross-linking component in thermally cross-linkable two-component polyurethane powder coating compositions.

Dimeric diol-modified powder coating cross-linking agents containing

A powder coating composition for the production of non-yellowing, flexible coatings which contains a mixture of a polyisocyanate component which contains one or more lacquer polyisocyanates having free (unblocked) isocyanate groups bound to primary and/or secondary carbon atoms and a polyol component containing one or more polyhydroxyl compounds selected from polyhydroxy polyurethanes, polyhydroxy polyacrylates and polyhydroxy polyesters, wherein at least 50% of the hydroxyl groups are bound to secondary or tertiary carbon atoms; and its use for coating heat-resistant substrates, in particular as clear coating compositions for automobiles.

The present invention relates to a powder coating composition having a glass transition temperature of 20.degree. to 80.degree. C. and containing (A) 56 to 86.9% by weight of a polyacrylate polyol component having a hydroxyl number of 30 to 155 and a glass transition temperature of 30.degree. to 120.degree. C., (B) 0.1 to 9% by weight of a polyester polyol component having a hydroxyl number of 40 to 180 and a glass transition temperature of -40.degree. to 80.degree. C., (C) 13 to 35% by weight of a polyisocyanate component having a glass transition temperature of -40.degree. to 60.degree. C. and containing at least one ketoxime-blocked polyisocyanate selected from (i) polyisocyanate derivatives prepared from 1,6-diisocyanatohexane and containing biuret, isocyanurate, uretdione, and/or urethane groups, (ii) polyisocyanate derivatives prepared from mixtures of 1,6-diisocyanatohexane and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane and containing isocyanurate groups and optionally uretdione groups and (iii) polyisocyanate derivatives prepared from 4,4'-diisocyanato-dicyclohexylmethane and containing urethane groups, and (D) at least one catalyst for the reaction between blocked isocyanate groups and hydroxyl groups, wherein i) the percentages of components (A), (B), and (C) are based on the total weight of these components and ii) components (A), (B), and (C) are present in amounts sufficient to provide an equivalent ratio of blocked isocyanate groups to hydroxyl groups of 0.5:1 to 1.5:1. The present invention is also relates to a process for the preparation of this powder coating composition and to heat-resistant substrates, particularly automotive body parts, coated with this powder coating composition.

Powder coating compositions, a process for their preparation, and their

A powder coating composition which is curable at 120.degree. to 150.degree. C. and contains A) one or more copolymers prepared from olefinically unsaturated monomers and containing epoxy groups and optionally hydroxyl groups, B) one or more curing agents containing carboxylic acid or carboxylic acid anhydride groups, and C) one or more polyaddition compounds which contain uretdione groups, have a melting point or range of 40.degree. C. to 120.degree. C. and are prepared from (cyclo)aliphatic diisocyanates; and its use for coating of heat-resistant substrates, especially automotive substrates.

Powder coating compositions and their use for coating heat resistant

The present invention relates to polyisocyanate mixtures which are solid below 40.degree. C. and liquid above 125.degree. C. and which have

Polyisocyanate mixtures, a process for their production and their use

The present invention relates to a process for the production of powder coating compositions having a glass transition temperature of 20.degree. to 80.degree. C. by

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Krefeld, Germany

Wolfgang Schultz