| 摘要 |
Polyester polyols (Mw of up to 3500 g/mol, a hydroxyl number of 80-280 mg/g) comprise aliphatic mono- or polycyclic compounds having at least two hydroxyl- and/or epoxy groups and at least one heteroatom, aliphatic acyclic or cyclic polyhydroxyl compounds having three or more hydroxyl groups per molecule, linear or branched aliphatic dihydroxyl compounds and aliphatic cyclic polycarboxylic acids. Polyester polyols (I) having a weight average molecular weight (Mw) of up to 3500 g/mol, a hydroxyl number of 80-280 mg/g and acid number of 5-40 mg/g comprise: (A) 1-18 mol. % aliphatic mono- or polycyclic compounds having at least two hydroxyl- and/or epoxy groups and at least one heteroatom; (B) 1-30 mol. % aliphatic acyclic or cyclic polyhydroxyl compounds having three or more hydroxyl groups per molecule; (C) 15-50 mol. % linear or branched aliphatic dihydroxyl compounds; and (D) 25-60 mol. % aliphatic cyclic polycarboxylic acids whereby the ratio of the sum of hydroxyl and epoxy groups of (A) and (B) to the number of hydroxyl groups of (C) is at least 1. Independent claims are included for: (i) mixtures (II) of acrylate copolymers and polyester polyol (I) whereby an acrylate copolymer is produced in the presence of the polyol (I) or is mixed with the polyol (I) after its synthesis whereby the monomer mixture used to form the copolymer comprises (G) an olefinically unsaturated monomer that is an alkyl-ester of an aliphatic linear, branched or cyclic alpha , beta -unsaturated monocarboxylic acids or an alkyl diester of an olefinically unsaturated aliphatic linear, branched or cyclic dicarboxylic acids having 1-20C alkyl and 3-10C acid groups. (H) a hydroxyalkyl ester of one of the mono- or dicarboxylic acids detailed in (G) whereby the hydroxyalkyl group is derived from an at least divalent aliphatic linear, branched or cyclic 2-15C alcohols and (I) at least one carboxylic acid as detailed in (G) in unesterified and/or half ester form with one of the alkyl groups detailed in (G) or with one of the hydroxyalkyl group listed in (H); and (ii) a lacquer (III) containing the polyester polyol (I) as a binding agent. |
