Ems Inventa Ag

Ems-chemie Ag

Rene Gisler

Andreas Kaplan

Albert Reich

Manfred Hoppe

Eberhard Kinkelin

The invention relates to a process for preparing a &bgr;-hydroxyalkylamide, in which alkyl esters are reacted with &bgr;-aminoalcohols in the absence of solvents and in the presence of basic catalysts, where, to improve the selectivity, the ratio of equivalents of ester to equivalents of amine is 1:1.001 to 8.

Process for preparing &bgr;-hydroxyalkylamides

A powder coating is prepared by (a) solvent polymerizing carboxy-functional acrylate copolymers, (b) separating and reacting the copolymers with a molar excess of at least one epihaloalkane, (c) removing excess epihaloalkane, (d) adding toluene and then reacting the copolymers with a sodium hydroxide solution to produce epoxy groups-containing acrylate copolymers having an epoxide number of from 0.018-0.501 eq/100 g copolymer, a weight average molecular weight of from 1000-30,000 and a Tg of from 20-120.degree. C.; and (e) extruding the epoxy groups-containing acrylate copolymers with a hardener such as aliphatic polybasic acids or anhydrides, or carboxy-functional polyesters or acrylic resins along with additives such as pigments or fillers.

Epoxidizing carboxy-functional acrylate copolymers with epihaloalkane

A method for making glycidyl ether-functional (meth)acrylate copolymers includes the step of reacting a hydroxyalkyl-functional (meth)acrylate copolymer with an epihalohydrin in the presence of a suitable catalyst. The reactants may be reacted by an addition reaction catalyzed with a Lewis acid catalyst, followed by dehydrohalogenation with aqueous alkali solution. Alternatively, the reactants may be reacted in a phase transfer reaction employing quaternary ammonium or quaternary phosphonium phase transfer catalysts.

Thermosetting powder-type coating compositions

The invention relates to Amorphous and/or semicrystalline copolyesters containing .beta.-hydroxyalkylamide groups according to formula (I) ##STR1## whereinP=polymer chain of the polyester

Amorphous and/or semicrystalline copolyesters containing

Thermosetting powder coatings based on epoxide-containing acrylate copolymer resins are disclosed comprising:

Thermosetting powder coating compositions include at least one glycidic-ether containing amorphous and/or semi-crystalline copolyester and a cross-linking agent which is an aliphatic and/or cycloaliphatic polybasic acid and/or its anhydride and/or a polyolmodified anhydride of a polybasic acid and/or amorphous or semi-crystalline carboxyl-functional copolyester resins and/or carboxyl-functional acrylate resins.

Thermosetting, powder coating compositions

A heat-curable, epoxy-free coating composition comprises a dry blend of at least two different binder resins, each binder resin comprising of (a) a carboxyl-terminated polyester resin having an acid value from 20 to 200 mg KOH/g and a glass transition temperature of at least 40.degree. C., and (b) a .beta.-hydroxylalkylamide with at least two .beta.-hydroxylalkylamide groups per molecule; the at least two different binder resins differing in functionality, or in other words in the number of carboxyl and/or .beta.-hydroxylalkylamide groups per binder resin molecule. Along with the binder resins, the coating composition optionally includes further additives that are typical for the processing and use of powder coatings.

Heat-curable coating composition comprising plurality of binder resins

A method for producing glycidic ether-containing amorphous and/or semi-crystalline copolyesters involves first producing a hydroxyl-functional amorphous or semi-crystalline copolyester, and then converting such hydroxyl-functional copolyester with an epihaloalkane to form the desired glycidic ether-containing copolyester.

Thermosetting, powder coating system

A heat-curable, epoxy-free coating system of binder resin is based on a hydroxyl-terminated polyester resin (a) with a hydroxyl number of from 20 to 200 mg KOH/g and a glass transition temperature of at least 40.degree. C., a carboxyl-group-containing, reversibly blocked polyisocyanate (b) and a b-hydroxyalkylamide (c) having at least two b-hydroxyalkylamide groups per molecule, and optionally further additives dictated by the usage and processing.

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Chur, Switzerland

Rene Gisler