Pulverent binders for powder coating compositions containing oligo- and polyurethanes having (meth)acryloyl groups
AssigneeBayer Aktiengesellschaft
InventorsJan Weikard, Christian Zwiener, Wolfgang Fischer, Peter Thometzek
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Abstract
The present invention relates to pulverent binders for powder coating compositions which contain oligo- and polyurethanes having (meth)acryloyl groups, are curable by means of high energy radiation and have an organic solvent content of less than 1 wt. %. The present invention also relates to a process for preparing these binders in the absence of an organic solvent and to their use in powder coating compositions for coating wood, metal, plastic, mineral and/or preprimed substrates.
Claims3
A pulverent binder for a powder coating composition which contains oligo- and polyurethanes having (meth)acryloyl groups, is.curable by means of high energy radiation and contains less than 1 wt. % of organic solvents wherein the binder comprises 10 to 95 wt. %, based on the total weight of oligo- and polyurethanes having (meth)acryloyl groups, of the reaction product of
- A) a monoisocyanate or diisocyanate having 4 to 20 carbon atoms with
- C) a monohydroxyalkyl (meth)acrylate having 2 to 12 carbons in the alkyl chain and
- 5 to 90 wt. %, based on the total weight of oligo- and polyurethanes having (meth)acryloyl groups, of the reaction product of
- B) a diisocyanate and/or a polyisocyanate that may be the same as A) or different than A) with
- D) at least one alcohol having (meth)acryloyl groups that may be the same as C) or different than C) and
- E) a compound which is free of (meth)acryloyl groups and contains two or more isocyanate-reactive groups.
Dependencies are inferred from the claim text.