Abstract: 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)1/2 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.

Abstract: 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.

Abstract: 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.

Abstract: A concrete admixture is provided, which is effective in imparting fluidity to a hydraulic composition such as cement paste, mortar or concrete, particularly in maintaining the fluidity of the composition and which hardly retards the hardening property of the composition. The concrete admixture comprises a copolymer comprising, as structural units, units derived from an ethylenically unsaturated monomer (a) having 25 to 300 moles of C.sub.2 -C.sub.3 oxyalkylene groups per mole of copolymer and units derived from a monomer (b) of an alkyl, alkenyl or hydroxyalkyl ester of an ethylenically unsaturated mono- or di-carboxylic acid.

Abstract: An admixture for concrete comprising, as an essential component, a copolymer prepared by copolymerizing (a) a polyalkylene glycol monoester monomer having 110 to 300 mols of an oxyalkylene group(s) each having 2 to 3 carbon atoms, with (b) at least one monomer selected from among acrylic monomers, unsaturated dicarboxylic monomers and allylsulfonic monomers. When this admixture is used in preparing concrete, the resulting concrete composition undergoes little change in the slump for a lengthened time, so that the quality of the concrete composition can be easily controlled.

Abstract: 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.