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US 2001/0041785 A1Published application
UV-curable coating compositions and their use for coating polycarbonate molded articles
AssigneeBayer Aktiengesellschaft
InventorsJurgen Meixner, Wolfgang Fischer, Josef Pedain
Life of this patent
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Abstract
UV-curable coating compositions containing urethane acrylates prepared from hydroxyalkyl acrylates and low-viscosity polyisocyanates having isocyanurate groups, low-viscosity acrylic ester components as reactive diluents, initiators, and optionally solvents and/or other known additives, and their use for coating molded articles of thermoplastic polycarbonates.
Claims8
An UV-curable coating composition containing
- A) 20 to 75 wt %, based on the total weight of components A), B) and C), of a reaction product, which is essentially free from hydroxyl and isocyanate groups and is prepared from
- A1) one or more hydroxyalkyl acrylates having 2 to 4 carbon atoms in the alkyl group, optionally mixed with up to 30 hydroxyl equivalent %, based on the total weight of component A1), of one or more other alcohols, and A2) an polyisocyanate component comprising an aliphatic polyisocyanate which contains isocyanurate groups, is based on 1,6-diisocyanatohexane and has an NCO content of 22 to 23.5 wt % and a viscosity at 23° C. of 800 to 1400 mPa.s,
- B) 5 to 80 wt %, based on the total weight of components A), B) and C), of a low-viscosity acrylic ester component containing
- B1) at least 80 wt % of one or more bis-acrylates having a molecular weight of less than 350 and based on an alkane diol which may contain ether oxygen atoms and
- B2) up to 20 wt %, based on the weight of component B), of one or more acrylic esters other than B1),
- C) 0 to 80 wt %, based on total weight of components A), B) and C), of a solvent or solvent mixture and
- D) 0.1 to 10 wt %, based on the total weight of components A), B) and C), of one or more photoinitiators.
4 more elements
A molded article of thermoplastic polycarbonate coated with an UV-curable coating composition containing
- A) 20 to 75 wt %, based on the total weight of components A), B) and C), of a reaction product, which is essentially free from hydroxyl and isocyanate groups and is prepared from
- A1) one or more hydroxyalkyl acrylates having 2 to 4 carbon atoms in the alkyl group, optionally mixed with up to 30 hydroxyl equivalent %, based on the total weight of component A1), of one or more other alcohols, and
- A2) an polyisocyanate component comprising an aliphatic polyisocyanate which contains isocyanurate groups, is based on 1,6-diisocyanatohexane and has an NCO content of 22 to 23.5 wt % and a viscosity at 23° C. of 800 to 1400 mPa.s,
- B) 5 to 80 wt %, based on the total weight of components A), B) and C), of a low-viscosity acrylic ester component containing
- B1) at least 80 wt % of one or more bis-acrylates having a molecular weight of less than 350 and based on an alkane diol which may contain ether oxygen atoms and
- B2) up to 20 wt %, based on the weight of component B), of one or more acrylic esters other than B1),
- C) 0 to 80 wt %, based on total weight of components A), B) and C), of a solvent or solvent mixture and
- D) 0.1 to 10 wt %, based on the total weight of components A), B) and C), of one or more photoinitiators.
5 more elements
Dependencies are inferred from the claim text.