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US 6,747,070 B2Granted
UV curable powder coating compositions
AssigneeDegussa AG
InventorsAndreas Wenning, Giselher Franzmann, Emmanouil Spyrou
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Abstract
A UV curable powder coating composition having a binder containing A) 60-90% by weight of at least one amorphous urethane acrylate and B) 10-40% by weight of at least one crystalline urethane acrylate; and having an auxiliary, crosslinks to form a light- and weather-stable paint film that possesses excellent gloss.
Claims17
An ultraviolet (UV) curable powder coating composition, comprising:
- I. a binder comprising
- A) 60-90% by weight of at least one amorphous urethane acrylate;
- and
- B) 10-40% by weight of at least one crystalline urethane acryrate;
- provided that a Tg of a mixture of A and B is at least 35° C.,
- the amount of each of A and B being based on a sum of A and B;
- and
- II. an auxiliary.
5 more elements
A polymer composition containing a urethane group and a terminal acrylate group, comprising:
- A) 60-90% by weight of at least one amorphous urethane acrylate;
- and
- B) 10-40% by weight of at least one crystalline urethane acrylate;
- provided that a Tg of a mixture of A and B is at least 35° C.,
- the amount of each of A and B being based on a sum of A and B;
- and
- wherein said amorphous urethane acrylate A is formed by reaction of the following components:
- A1) at least one amorphous hydroxyl-containing polyester having a Tg of 35 to 80° C.;
- A2) at least one polyisocyanate;
- A3) at least one compound having at least one alcohol group and at least one polymerizable acrylate group;
- and
- wherein said crystalline urethane acute B is formed by reaction of the following components;
- B1) at least one crystalline hydroxyl-containing polyester;
- B2) at least one polyisocyanate;
- and
- B3) at least one compound having at least one alcohol group and at least one polymerizable acrylate group.
13 more elements
Dependencies are inferred from the claim text.