Lintec Corporation

Soichiro Fujinaga

Takamasa Kase

Takehiko Nishikawa

Atsushi Tezuna

Fumio Hayakawa

The present invention is a paint coat-protecting removable pressure-sensitive adhesive sheet comprising a base sheet, and a pressure-sensitive adhesive layer that is provided on the base sheet, the pressure-sensitive adhesive layer being formed of an emulsion pressure-sensitive adhesive composition that includes an emulsion of an ethylene-vinyl carboxylate copolymer as a main component. The present invention provides a paint coat-protecting removable pressure-sensitive adhesive sheet that does not cause swelling, whitening, and adhesive transfer even when the pressure-sensitive adhesive sheet is attached to the surface of a paint coat that has not been sufficiently dried (i.e., contains a small amount of solvent) or has not been sufficiently cured after drying, and removed from the paint coat.

Paint coat-protecting removable pressure-sensitive adhesive sheet

A material film for a mask film comprising a substrate film transmitting ultraviolet light and a resin layer not transmitting ultraviolet light disposed on one face of the substrate film, the resin layer having a color which can be eliminated by irradiation with laser beams, a transmittance of ultraviolet light of 0.1% or smaller, a thickness of 0.1-30 &#x3bc;m and an average surface roughness on a central line Ra of 0.1-3 &#x3bc;m and comprising carbon black having an average particle diameter of 20-50 nm and a specific surface area of 70-150 m/g. The resin layer exhibits uniform transparency at portions the color of which is eliminated and suppresses formation of scratches. The mask film is easily positioned in preparation of great printing plates and good contact is easily attained throughout the entire surface suppressing containment of air between the mask film and the printing plate material.

Material film for a mask film, process for producing a mask film using the material film and process for producing a printing plate of a photosensitive resin

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Tokyo, Japan

Soichiro Fujinaga