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

US6211306A · kind A · utility

Assignee

• Solutia Austria GmbH · AT

Inventors

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

Key dates

• Filing date: May 31, 2000
• Grant date: Apr 3, 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

Mixtures of low molar mass polyester polyols having a weight-average molar mass M.sub.w 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 structural units derived from aliphatic polycyclic polyhydroxy compounds having at least two hydroxyl groups per molecule, branched aliphatic acyclic dihydroxy compounds, aliphatic cyclic polycarboxylic acids, aliphatic acyclic or monocyclic polyhydroxy compounds having three or more hydroxyl groups per molecule, and polyfunctional compounds selected from aliphatic linear and monocyclic dihydroxy compounds, aliphatic linear and branched dicarboxylic acids, aromatic dicarboxylic acids and polycarboxylic acids having three or more carboxyl groups per molecule, and also monofunctional units selected from monocarboxylic acids and monoalcohols, and acrylic copolymers made by radically initiated polymerisation in the presence of cyclic compounds that can react with hydroxy or acid functional comonomers can be used as binders in very high solid one-pack or two-pack coating compositions, especially in spray surfacers.