Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1978-04-07
1979-08-21
Turer, Richard B.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
20415915, 20415916, 20415919, 260 22CB, 260 22TN, 260 312N, 260 40R, 260 40TN, 427 54, 428425, 428458, 428461, C08G 1800, C08G 6300
Patent
active
041652657
ABSTRACT:
A method of curing a photo-curable coating composition comprises multi-stage irradiation steps with actinic radiations in the presence of air: the initial step involving irradiation with actinic radiation having wavelengths in a range from about 185 to 500 millimicrons with dominant wavelength or wavelengths between about 380 and 420 millimicrons and the subsequent step involving irradiation with another actinic radiation of wavelengths within the same range as those of the radiation used for the initial step but having dominant wavelength or wavelengths within a range shorter than those of the radiation used therefor and the initial irradiation being effected so as to cure the lower part of the coating layer with the surface portion thereof left uncured and the subsequent irradiation leading to the full cure of the surface portion thereof. The coating film or layer thus treated possesses a high covering or hiding power, good appearance and desired shade with a smooth and glossy surface, having neither crinkles nor wrinkles thereon.
REFERENCES:
patent: 3790801 (1974-02-01), Coleman
patent: 3840448 (1974-10-01), Osborn et al.
patent: 3918393 (1975-11-01), Hahn
patent: 3943046 (1976-03-01), De Sorga et al.
Iimure Tamio
Matsuura Taizo
Nakabayashi Seizi
Nippon Paint Co. Ltd.
Turer Richard B.
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