C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/06 (2006.01) C08G 18/32 (2006.01) C08G 18/67 (2006.01) C08G 18/72 (2006.01) C08G 18/73 (2006.01) C09D 175/04 (2006.01) C09D 175/16 (2006.01)
Patent
CA 2106650
POLYURETHANES CONTAINING ACRYLOYL GROUPS, A PROCESS FOR THEIR PREPARATION AND THEIR USE AS BINDERS FOR COATING COMPOSITIONS ABSTRACT OF THE DISCLOSURE The present invention relates to polyurethanes which contain acryloyl groups, have a viscosity at 23°C of 800 to 100,000 mPa.s, and are prepared by reacting at an NCO/OH equivalent ratio of 0.7:1 to 1:1, I) an organic isocyanate component containing a) 20 to 50 mole % of one or more organic diisocyanates, other than hexamethylene diisocyanate, which have aliphatically and/or cycloaliphatically bound isocyanate groups and a molecular weight of less than 300 and b) 50 to 80 mole % of hexamethylene diisocyanate with II) a hydroxyl component containing c) 43 to 93 hydroxyl equivalent % of an alcohol component which has an average hydroxyl functionality of 0.8 to 1.5 and contains one or more alcohols having acryloyl groups and a molecular weight of 116 to 1000, provided that at least 50 mole % of component c) is made up of ether group-containing esterification products of acrylic acid with ether group-containing alcohols which are at least trihydric, wherein the esterification products have an average molecular weight of 300 to 1000 and an average hydroxyl functionality of 0.8 to 1.5, d) 7 to 50 hydroxyl equivalent % of one or more monohydric or dihydric branched alcohols having a molecular weight of 130 to 300 and e) 0 to 50 hydroxyl equivalent % of one or more monohydric or polyhydric alcohols having a molecular weight of less than 130. The present invention also relates to a method of preparing these polyurethanes and to their use as binders for coating compositions, particularly for those which can be hardened by high-energy radiation.
Fischer Wolfgang
Meixner Jurgen
Aktiengesellschaft Bayer
Swabey Ogilvy Renault
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