Back to results
US 6,306,504 B1Granted
Polycarbonate molded articles coated with UV-curable compositions
AssigneeBayer Aktiengesellschaft
InventorsJürgen Meixner, Wolfgang Fischer, Josef Pedain
Life of this patent
Estimating the term…
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.
Claims4
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.