Polyester polyols of low molar mass, their preparation and use in coating compositions

US6258897A · kind A · utility

Assignee

• Vianova Resins AG · DE

Inventors

• Ulrich Epple · Eschborn, DE
• Ulrike Kuttler · Graz, AT
• Claudia Pietsch · Graz, AT

Key dates

• Filing date: May 31, 2000
• Grant date: Jul 10, 2001
• Expiry date: May 31, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D175/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Low molar mass polyester polyols having a weight-average molar mass M, of not more than 2000 g/mol, with hydroxyl numbers of from 80 to 300 mg/g and acid numbers of from 5 to 35 mg/g, comprising the stated mole fractions (in %=mol/100 mol) of structural units derived from: PA1 a) from 1 to 45% of aliphatic polycyclic polyhydroxy compounds having at least two hydroxyl groups per molecule, PA1 b) from 5 to 50% of branched aliphatic acyclic dihydroxy compounds, PA1 c) from 30 to 50% of aliphatic cyclic polycarboxylic acids, PA1 d) from 0 to 30% of aliphatic acyclic or monocyclic polyhydroxy compounds having three or more hydroxyl groups per molecule, and PA1 e) from 0 to 10% of polyfunctional compounds selected from aliphatic linear and monocyclic dihydroxy compounds, aliphatic linear and branched dicarboxylic acids, aromatic dicarboxylic acids and polycaboxylic acids having three or more carboxyl groups per molecule, and also PA1 f) from 0 to 10% of monofunctional units selected from monocarboxylic acids and monoalcohols, the mole fractions indicated in each case under a), b), c), d), e) and f) adding up to 100% and use of these low molar mass polyester polyols or mixtures thereof of…