Nippon Shokubai Co., Ltd.

Toshio Hayashiya

Kenji Matsukawa

Hiroshi Yamazaki

Tsuyoshi Hirata

Tsutomu Yuasa

Tomiyasu Ueta

Katsura Hayashi

Koji Takabatake

Daisaku Yamamoto

Hironori Funaki

There are provided an admixture for cement which enhances water reducing property and flowability of a cement composition, and is excellent in slump retaining performance to retain the flowability with time, a polycarboxylic acid-based polymer for an admixture for cement suitable therefor, a producing method thereof, and a cement composition. One admixture for cement of the present invention contains copolymers (A) and (B) as an essential component, weight average molecular weights (AMw and BMw) of copolymers (A) and (B) are AMw&#x3e;BMw, or peaktop molecular weights (AMp and BMp) of copolymers (A) and (B) are AMp&#x3e;BMp. Another admixture for cement of the present invention contains a polycarboxylic acid-based polymer having a lower molecular weight side area ratio P of 50 to 87%.

Admixture for cement

Dicyclopentadiene-modified unsaturated polyester and process for producing the same as well as resin composition and molding material each containing unsaturated polyester

A resin composition includes a dicyclopentenyl-group containing unsaturated polyester resin, a phenothiazine derivative (a) and an anion producing compound (b). On the other hand, resin composition includes a thermosetting resin, a phenothiazine derivative (a), an anion producing compound (b) and a phosphorous ester (c). A manufacturing method of resin composition includes the step of obtaining a dicyclopentenyl-group-containing unsaturated polyester by polycondensing unsaturated polyester material including a compound having a dicyclopentenyl group, and the step of mixing a cross-linking monomer with the obtained dicyclopentenyl-group-containing unsaturated polyester, wherein the phenothiazine (a) and the anion producing compound (b) are added in at least one of those steps. This provides the resin composition which produces no gel during storage and has very little gel time drift and viscosity drift, and moreover which produces a cured product of good hue, water resistance and surface drying characteristics, and further provides the manufacturing method of such resin composition.

Resin composition and manufacturing method thereof

Growing community of inventors

Toyono-gun, Japan

Toshio Hayashiya