Nippon Shokubai Co., Ltd.

Nippon Steel Corporation

Katsuyuki Kono

Tsuyoshi Hirata

Tsutomu Yuasa

Masatoshi Yoshida

Keiichi Nakamoto

Kiyoshi Kawamura

Teruo Kikuta

Yuko Watanabe

Tsutomu c/o Nippon Steel Corp Tech Devlp Okada

Takehiko c/o Hokkai Iron & Coke Sato

Kazuyuki c/o Nippon Steel Corp Yawata Shinagawa

Yohzoh c/o The Iron And Steel Inst Hosotani

The present invention provides a porous film obtained by coagulating polymer particles in an emulsion into the form of a film while maintaining their particle shape. The spaces between particles are left as pores, and as a result, the porous film has a plurality of thus-formed pores. By controlling the polymer particle diameter, the distribution of the particle diameter, and the solid concentration of the emulsion, the size of the pores of the film, the rate of pore area and the density of pores can be properly determined. The porous film is suitable for various applications including a recording subject for ink-jet printing, other recording subjects, films used in various industries, and the like.

Porous film, process for the production thereof and recording subject comprising the porous film

A novel cement admixture is provided which fulfills the function as a thickener basically, possesses an ability to inhibit segregation of materials, excels in workability as well, and permits a decrease in the amount of addition while keeping these functions intact. The cement admixture is characterized by comprising a cement additive formed of a polymer resulting from polymerizing a monomer mixture having methyl acrylate as a main component thereof and a cement water reducing agent.

Cement additive and cement composition using same

An aqueous resin dispersion for a heat-sensitive recording material is disclosed. The aqueous resin dispersion is obtained by the use of polyvinyl alcohol as an emulsifier and the use of two steps of polymerization. In the first step of polymerization, a polymeric monomer composition A is polymerized, composition A containing polymeric multi-functional monomers which constitute 15% by weight or more of the total weight of the polymeric monomers used for the first step. And, in the second step, a polymeric monomer composition B is polymerized, The invention also discloses a heat-sensitive recording material using such an aqueous resin dispersion as a color-developing layer or a protective coating.

Aqueous resin dispersion for heat-sensitive recording material and

A heat-sensitive recording material excelled in surface gloss and printing concentration is disclosed. The disclosed heat-sensitive recording material with a heat-sensitive color-developing layer formed on a supporting member features provision on the surface of the heat-sensitive color-developing layer of a protective coating containing crosslinked microfine particles (B) having substantially no glass transition temperature, 0.5 .mu.m or less in mean particle size and 0.05 or less in the difference in refractive index from the solid content of aqueous resin despersion which are obtainable by emulsion-polymerizing vinyl-containing monomers containing 15 weight % or more of polymeric multifunctional monomers together with the aqueous resin dispersion (A).

Heat-sensitive recording material

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Takatsuki, Japan

Katsuyuki Kono