Kao Corporation

Haruyuki Satoh

Fujio Yamato

Yoshinao Kono

Yoshiaki Tanisho

Tatsuo Izumi

Fuzio Yamato

Shuichi Fujita

Keishi Shimokawa

Kazushige Kitagawa

Haruya Mino

Sayuri Nakamura

The invention provides a paper quality improver for papermaking that allows improvement in the bulky value and the optical properties such as brightness and opacity as well as in the paper strength of a sheet obtained by papermaking a pulp material. The paper quality improver for papermaking is a paper quality improver for papermaking containing a copolymer (A) having a constituent unit derived from at least one nonionic monomer having a solubility parameter of 20.5 (MPa)or less and a constituent unit derived from at least one anionic or cationic monomer and a surfactant (B) at a certain ratio, the quality improver providing at least one paper quality improving effect of: (i) standard improved bulky value: 0.02 g/cm or more; (ii) standard improved opacity: 1.0 point or more; and (iii) standard improved brightness: 0.5 point or more.

Paper improver

The present invention provides a concrete admixture which is useful in the field of a highly strong concrete, which has a high flowability and which is excellent in an applicability of a concrete paste. That is, the present invention provides a concrete admixture comprising a copolymer-mixture obtained by copolymerizing a specific monomer (A) such as an ethylene-based unsaturated carboxylic acid-derivative having a polyoxyalkylene group and a specific monomer (B) such as a (meth)acrylic acid with changing the molar ratio of (A)/(B) at least one time in the polymerization course, as well as a concrete composition comprising the said concrete admixture.

Concrete admixture

Admixture for concrete

When a cement dispersant comprising a polymer which is obtained by co-condensating monomers comprising monomer (A) and monomer (B) with formaldehyde, or a salt obtained by neutralizing the polymer, wherein the monomer (A) is an aromatic compound having, on the average, 1 to 300 mol per molecule of at least one member selected from the group consisting of oxyethylene group and oxypropylene group, and the monomer (B) is an aromatic compound having a carboxyl group; or another cement dispersant comprising a polymer which is obtained by co-condensating monomers comprising the above-described monomer (A), the above-described monomer (B) and monomer (C) which is an aromatic compound having a sulfonic acid group with formaldehyde, or a salt obtained by neutralizing the polymer is used as one component of a hydraulic composition, the fluidity of the hydraulic composition is maintained for a long time. Therefore, no trouble on transportation is caused during the force feeding of the hydraulic composition with a pump.

Cement dispersant

Growing community of inventors

Wakayama, Japan

Haruyuki Satoh