HIGH-SOLIDS BINDER COMBINATIONS FOR SCRATCH-RESISTANT TOPCOATS

摘要

High-solids binder combinations comprising polyisocyanates, special lacton e- based polyols and polyacrylate-polyols, a process for preparing such binders , and their use for producing coatings. The lactone-based polyols include .epsilon.-caprolactone-based polyols havin g an average hydroxy functionality .gtoreq. 2 and a number-average molecular weight of fr om 119 to 2000 g/mol. The polyacrylate resins are prepared by copolymerizing optionall y functional polybutadienes, aromatic monomers, hydroxyalkyl esters of acrylic or methacrylic acid having primary hydroxyl groups, aliphatic esters of acrylic or methacrylic acid and C1 to C8 monoalcohols, .alpha.,.beta.-unsaturated C3 - C7 monocarboxylic or dicarboxylic acids or of one or more monoesters of maleic acid or fumaric acid and C1 to C14 monoalchols.