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US 10,472,539 B2Granted
One-component amino resin coating compositions
AssigneeBASF SE
InventorsHarald Schaefer, David Tuerp, Daniel Flojhar
Life of this patent
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Abstract
The present invention relates to one-component amino resin coating compositions having good chemical resistance, a good balance of hardness to elasticity, and rapid drying, to their use, and to methods for coating. Synthesis components that the coating compositions comprise include amino resin, hydroxyl-containing polymers as principal polyols, and certain branched polyester polyols, obtainable by polycondensation of hexahydrophthalic anhydride, trimethylolpropane, and optionally further components.
Claims18
A one-component amino resin coating composition, comprising as synthesis components
- (A) at least one amino resin selected from the group consisting of a melamine-formaldehyde resin, a benzoguanamine-formaldehyde resin, and a urea-formaldehyde resin,
- (B) at least one hydroxyl-containing polymer selected from the group consisting of a poly(meth)acrylate polyol (B1), a polyester polyol (B2), a polyetherol (B3), an alkyd resin (B4), and a polycarbonate polyol (B5),
- (C) at least one branched polyester polyol prepared by polycondensation of hexahydrophthalic anhydride,
- trimethylolpropane,
- optionally at least one diol,
- optionally at least one further triol, and
- optionally at least one further diacid or triacid or a derivative thereof,
- where a molar ratio of acid groups to hydroxyl groups in preparing the polyester polyol is 1:1 to 1:1.95, the polyester polyol contains less than 20% tetraalcohol stoichiometrically relative to hexahydrophthalic anhydride, and
- the polyester polyol is not formed from dihydroxycarboxylic acids,
- (D) optionally at least one chemical crosslinker selected from the group consisting of a blocked polyisocynate, a trisalkylcarbamoyltriazine, an epoxy resin, a carboxyl containing resin, and an amino-containing resin other than the amino resin (A),
- (E) optionally at least one organic solvent,
- (F) optionally at least one catalyst,
- (G) optionally at least one coating additive, and
- (H) optionally at least one filler, dye and/or pigment,
- wherein a ratio of (B) to (C) is greater than 1:1 based on solids,
- a molar ratio of the hydroxyl groups of trimethylolpropane to the hydroxyl groups of the at least one diol is greater than 1:1, and
- the at least one branched polyester polyol (C) has a sum total of acid number according to DIN EN ISO 2114:2000 and hydroxyl number according to DIN 53240-2:2007-11 of 200 to 400 mg KOH/g.
14 more elements
A method for coating a substrate, the method comprising:
- mixing an amino resin (A), a polymer (B), and a polyester polyol (C), optionally a chemical crosslinker (D), optionally at least one organic solvent (E), optionally at least one catalyst (F), optionally at least one coating additive (G), and optionally at least one filler, dye, and/or pigment (H), to obtain a mixture, and
- subsequently applying the mixture to the substrate,
- wherein
- the amino resin (A) is at least one selected from the group consisting of a melamine-formaldehyde resin, a benzoguanamine-formaldehyde resin, and a urea-formaldehyde resin,
- the polymer (B) is at least one hydroxyl-containing polymer selected from the group consisting of a poly(meth)acrylate polyol (B1), a polyester polyol (B2), a polyetherol (B3), an alkyd resin (B4), and a polycarbonate polyol (B5),
- the polyester polyol (C) is at least one branched polyester polyol prepared by polycondensation of
- hexahydrophthalic anhydride,
- trimethylolpropane,
- optionally at least one diol,
- optionally at least one further triol, and
- optionally at least one further diacid or triacid or a derivative thereof,
- where a molar ratio of acid groups to hydroxyl groups in preparing the polyester polyol is 1:1 to 1:1.95, the polyester polyol contains less than 20% tetraalcohol stoichiometrically relative to hexahydrophthalic anhydride, and the polyester polyol is not formed from dihydroxycarboxylic acids,
- the chemical crosslinker (D) is at least one selected from the group consisting of a blocked polyisocynate, a trisalkylcarbamoyltriazine, an epoxy resin, a carboxyl-containing resin, and an amino-containing resin other than the amino resin (A),
- a molar ratio of the hydroxyl groups of trimethylolpropane to the hydroxyl groups of the at least one diol is greater than 1:1, and
- the polyester polyol (C) has a sum total of acid number according to DIN EN ISO 2114:2000 and hydroxyl number according to DIN 53240-2:2007-11 of 200 to 400 mg KOH/a.
12 more elements
Dependencies are inferred from the claim text.