STRIPPABLE COATING FILM AND COATING METHOD USING SAME

摘要

This invention relates to a strippable coating film for use as a masking material serving to create attractively finished boundaries, for example, in multicolor 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.degree. 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 undercoating 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.