C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 75/06 (2006.01) C08G 18/08 (2006.01) C08G 18/12 (2006.01) C08G 18/44 (2006.01) C08G 18/66 (2006.01) C09D 175/04 (2006.01) C09D 175/06 (2006.01)
Patent
CA 2143026
The present invention relates to aqueous dispersions of polyester-polyurethanes which contain hydroxyl groups and are prepared from a) 15 to 90% by weight of one or more essentially linear, polyester polyols, b) 4 to 75% by weight of one or more essentially difunctional polyols selected from i) polycarbonates, ii) polyether polyols and iii) polyester polyols which are obtained by the hydrogenation of carboxyl groups to hydroxyl groups, the alkoxylation of carboxyl groups or the esterification of carboxyl groups using low molecular weight diols of dimeric fatty acids, c) 1 to 10% by weight of one or more components containing acid groups selected from i) hydroxycarboxylic acids, ii) amino acids, iii) aminosulphonic acids and iv) alkali salts of the acids of i), ii) and iii), d) 0 to 20% by weight of a low molecular weight component containing at least two hydroxyl and/or amino groups, e) 0 to 20% by weight of one or more hydrophilic monovalent or divalent alcohols and f) 5 to 50% by weight of a polyisocyanate component containing at least 50% by weight of linear aliphatic diisocyanates having a molecular weight of 168 to 300, wherein the sum of the percentages of components a) to f) is 100. The present invention also relates to aqueous coating compositions containing as these polyester-polyurethanes as a binder component and to compositions, in particular for the production of soft feel coatings, and which combine a good soft feel effect, good film mechanics and surface bonding, and acceptable resistance to solvents. It is an additional object of the present invention for these compositions to contain as few volatile organic substances as possible, so that they are capable of satisfying environmental requirements. These objects may be achieved with the aqueous polyester-polyurethane dispersions and coating compositions described in more detail below.
Blum Harald
Petzoldt Joachim
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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