H - Electricity – 05 – K
Patent
H - Electricity
05
K
H05K 3/06 (2006.01) G03F 7/16 (2006.01) H05K 3/00 (2006.01) H05K 3/12 (2006.01) H05K 3/22 (2006.01)
Patent
CA 2162714
A process for coating printed circuit boards with a coating composition that is crosslinkable by electromagnetic radiation, especially UV radiation, using the roll coating process, is distinguished by the following process steps: - a photopolymerisable, meltable, low-molecular-weight coating composition that is highly viscous to solid at room temperature and has an average molecular weight of preferably from 500 to 1500 is melted and fed to the applicator roll of a roll coating apparatus; - the coating composition is coated at a temperature of approximately from 60°C to 110°C and a viscosity of approximately from 1000 to 20 000 mPas on to the surface(s) of a printed circuit board in a thickness of approximately from 10 to 200 µm, - the surface of the printed circuit board to be coated being pre-heated, prior to coating, to a temperature that is approximately from 10°C to 50°C higher than the application tempera- ture of the coating composition. An apparatus suitable for carrying out the process outlined above is also described.
Fetherstonhaugh & Co.
Vantico Ag
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