Other

Masayuki Matsuki

Hideaki Tojo

Hisashi Kurota

Noritsumi Matsuyama

Kenji Yamashita

Hideki Obara

Hirotaka Asai

Kensaku Akasaka

Takanori Endo

A composition for peelable coating, which composition exhibits excellent properties such as film-formability and water resistance and can be dried at ambient temperature without any particular heating, to thereby provide excellent coating performance. The composition contains a core/shell copolymer including an acrylic copolymer portion A having a high glass transition temperature of 30&deg; C.-70&deg; C. and an acrylic copolymer portion B having a low glass transition temperature of 5&deg; C. to &minus;30&deg; C. and being formed through multi-step polymerization. The core/shell copolymer is made up of 5-40 wt. % of the acrylic copolymer portion A and 60-95 wt. % of the acrylic copolymer portion B, on the basis of the total amount of the portion A and the portion B. The acrylic copolymer portion A and the acrylic copolymer portion B contain the same hard-polymer-providing monomer unit and soft-polymer-providing monomer unit. Each copolymer portion contains a hard-polymer-providing monomer unit and a soft-polymer-providing monomer unit in a total amount of 70 wt. % or more.

Composition for peelable coating

The aqueous dispersion of a peelable coating composition of the present invention is (a) a mixture containing 5-40% by weight of an emulsion of an acrylic copolymer having a glass transition temperature (hereinafter referred to as &ldquo;Tg&rdquo;) of not lower than 40&deg; C., and 95-60% by weight of an emulsion of another acrylic copolymer having a Tg ranging from &minus;20&deg; C. through 5&deg; C. The acrylic copolymer emulsion mixture (b) contains ethylenically unsaturated vinyl monomers having acid value in a total amount of 0.5-1.0% by weight, and (c) at least one of the acrylic copolymer emulsions is an acrylic copolymer which has been polymerized by use of a reactive surfactant, and (d) the particle size of the acrylic copolymer emulsions is not more than 200 nm.

Aqueous dispersion of a peelable coating composition

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Hadano, Japan

Masayuki Matsuki