| 摘要 |
<p>A copolymer solution consisting of A) 10 to 30 % by weight of inert organic solvents and B) 70 to 90% by weight of copolymers prepared by simultaneous and joint polymerisation and condensation reaction in the presence of mixtures of diacyl peroxides or peresters and alkyl hydroperoxides or dialkyl peroxides as polymerisation initiators by heating to 165 to 180.degree.C, a mixture of said inert solvents A) having a boiling range from 150 to 200.degree.C and components a) 5 - 24 % by weight of glycidyl esters of ?-alkylalkanemonocarboxylic acids and/or ?,?-dialkylalkanemonocarboxylic acids of the following empirical formula C12-14H22-26O3, followed by slow uniform addition of a mixture of b) 12 - 30 % by weight of hydroxyethyl acrylate and/or hydroxethyl methacrylate,c) 1 - 10 % by weight of acrylic acid, d1) 20 - 50 % by weight of styrene and d2) 5 - 35 % by weight of methyl methacrylate, components a, b, c, d1, and d2 and components A and B respectively having been employed in quantities to a total up to 100 % by weight each and with the proviso that the components a, b, and c have been employed in such quantities to obtain copolymers having a hydroxyl group content of 3.5 to 6.5 % by weight. The present invention relates further to a process for the preparation of said copolymer solutions. The copolymer solution can be employed either in reactive lacquers in an amount of 60 - 80 % by weight together with 20 - 40 % by weight of an organic polyisocyanate or in a coating composition which dries by physical means in an amount of 20 - 80 % by weight together with 20 - 80 % by weight of a thermoplastic copolymer. Substrates of the most diverse types, for example porous or non-porous substrates, such as textile non-wovens, leather of plastics can be coated with these mixtures. In every case high-gloss, pore-free, elastic and solvent-resistant coatings having a very hard surface are obtained. Compared with the known copolymers, the advantages of the instant copolymers in combination with polyisocyanates are better solvent-resistance, higher abrasion resistance and better resistance to weathering in the Florida climate. Moreover, clear lacquers or pigmented lacquers do not exhibit crater formation or blistering.</p> |
