C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/7928
C08L 33/14 (2006.01) C08F 220/28 (2006.01) C08G 18/62 (2006.01) C09D 133/14 (2006.01)
Patent
CA 1097445
ABSTRACT OF THE DISCLOSURE The present invention relates to a special copolymer solution consisting of acrylic resin containing 70 to 90 % by weight of copolymer solids and 10 to 30% by weight of solvent. The invention also relates to a process for the manufacture of the copolymers which are present in the copolymer solution; additionally, the invention relates to the use of the copolymer solution for the manufacture of coating compositions for lac- quer systems of low solvent content which contain polyisocya- nates and which contain the copolymer manufactured according to the invention as a resin component which carries hydroxyl groups. The outstanding advantage of the copolymer solutions manufactured according to the invention resides in the fact that it is possible for the hydroxyl groups of the copolymers to crosslink with polyisocyanates at room temperature and also at elevated temperatures and to produce lacquers of high solids content. Compared with the known copolymers, the copolymers manufactured according to the invention display the following advantages in the combination with polyisocyanates: better solvent-resistance, higher abrasion resistance and better resistance to weathering in the Florida climate. Moreover, the clear lacquers or pigmented lacquers do not exhibit crater formation or blistering. The copolymers can be employed, together with polyiso- cyanates, for the production of coatings or coverings in the reactive lacquers, on substrates of the most diverse types, for example porous or non-porous substrates, such as textile non-wovens, leather of plastics. In every case high-gloss, pore- free, elastic and solvent-resistant coating having a very hard surface are obtained. - 1 -
276756
Hoechst Aktiengesellschaft
Macrae & Co.
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