C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
117/100, 400/703
C09D 5/20 (2006.01) B05D 1/32 (2006.01) B05D 5/06 (2006.01) B32B 7/06 (2006.01) B32B 27/18 (2006.01)
Patent
CA 1299793
ABSTRACT This invention relates to a strippable coating film for use as a masking material serving to create attractively finished boundaries, for example, in multi- color painting of automobiles and the like, as well as a coating method using such a coating film. A coating film containing 1 to 20 parts by weight of carbon black per 100 parts by weight of the resin component present therein is suitable. Especially preferred is a coating film formed of an acrylic emulsion paint and having an adhesion to the substrate of 20 to 1000 g/inch as expressed in terms of 180° peeling strength. It is disclosed that, by equipping a YAG laser with a Q-switching oscillator unit and operating the Q-switch at a pulse repetition frequency of 0.5 to 30 kHz, the coating film can be cleanly cut to achieve an attractive finish in multi-color painting. Alternatively, a two-layer coating film containing the above-defined amount of carbon black may be formed by applying a coating material having adhesive power to a substrate to form an undercoating layer in contact with the substrate and then applying a coating material having flexibility and exhibiting film-forming properties to the under- coating layer to form an overcoating surface layer. This two-layer coating film is more effective than the single-layer coating film in preventing the substrate from being damaged.
500714
Kamada Keiichi
Okita Yasuo
Torikai Motoyuki
Kamada Keiichi
Mitsui Toatsu Chemicals Inc.
Okita Yasuo
Sim & Mcburney
Torikai Motoyuki
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