Nippon Shokubai Co., Ltd.

Mbt Holding Ag

Hisamitsu Pharmaceutical Company, Inc.

Tsutomu Yuasa

Tsuyoshi Hirata

Noboru Sakamoto

Koichiro Nagare

Hiromichi Tanaka

Toru Uno

Hirokatsu Kawakami

Yoshiyuki Onda

Hideyuki Tahara

Tomotaka Nishikawa

Tomiyasu Ueta

Katsuhisa Shiote

Hirokazu Niwa

Hiroko Izukashi

Yuko Matsuda

Syogo Iwai

Shogo Iwai

Yoshio Tanaka

Akira Ohta

Akihiko Yamashita

Hiroshi Yamazaki

Takeshi Goto

Takashi Tomita

Hideyuki Nishibayashi

Hideaki Nagano

Naohiko Itayama

Hiroko Okochi

Katsuyuki Kono

Toshio Hayashiya

Kazuhisa Yoshitake

Kazuteru Moriyama

Daisuke Imai

Masato Nishiue

Hisamoto Kawano

Shuichi Toriya

Hiroshi Osamura

Mari Otani

To provide a production method of a (poly)alkylene glycol chain-containing polymer which can be preferably used in various applications such as an admixture for cement and which can exhibit extremely high dispersibility to a cement composition. The unsaturated (poly)alkylene glycol ether monomer of the present invention is an unsaturated (poly)alkylene glycol ether monomer production method for producing an unsaturated (poly)alkylene glycol ether monomer by addition reaction of an alkylene oxide on an unsaturated alcohol, wherein the production method includes a step of carrying out addition reaction under condition of existence of 0.01 to 25 parts by mass of an unsaturated (poly)alkylene glycol diether monomer to 100 parts by mass of the unsaturated alcohol, and a (poly)alkylene glycol chain-containing polymer production method, wherein a monomer component including an unsaturated (poly)alkylene glycol ether monomer produced by the production method.

Production method of unsaturated (poly)alkylene glycol ether monomer and production method of (poly)alkylene glycol chain-containing polymer

The present invention provides a multi-branched polyalkylene glycol polymer useful for various applications, especially for an admixture for cement, a dispersant, admixture for cement, and cement composition each comprising the same, a thiol compound having a polyalkylene glycol chain useful for materials and the like of the polymer, and a method for easily and effectively producing the multi-branched polyalkylene glycol polymer and the thiol compound having a polyalkylene glycol chain at low cost. The multi-branched polymer comprises: a polyalkylene glycol chain; a residue of a compound having three or more active hydrogen atoms; and a polymer portion having a constitutional unit derived from a vinyl monomer component, one end of the polyalkylene glycol chain bonding to the residue, and a terminal oxygen atom of at least one of the other ends of the polyalkylene glycol chain bonding to a main chain end of the polymer portion directly or via an organic residue.

Multi-branched polyalkylene glycol polymer, method for producing the same, and admixture for cement

The present invention provides a novel polymer, and a mixture and a cement admixture thereof. The cement admixture has higher dispersibility compared to the previous ones. The novel polymer of the present invention has a different structure from the conventional copolymers used for cement admixtures, using an unsaturated carboxylic acid monomer and an unsaturated polyalkylene glycol monomer as the monomer components. The novel polymer of the present invention basically contains a polyalkylene glycol chain and a polymer segment bonded to the chain. Another type of the novel polymer of the present invention contains two polyalkylene glycol chains and a polymer segment connecting the chains. In these polymers, at least one of unsaturated monomers constituting the polymer segment is an unsaturated carboxylic acid monomer or an unsaturated polyalkylene glycol monomer. The cement admixture of the present invention comprises a polymer, made from these monomers, or a mixture thereof.

Polymer and cement admixture using the same

To provide a polyalkylene glycol chain-containing thiol polymer which is excellent in various performances, particularly significantly excellent in cement dispersibility, and useful in various applications such as an admixture for cement; a thiol-modified monomer or a mixture thereof, which can produce such a polymer; production methods of the polymer and the monomer; and a dispersant and an admixture for cement, each including the polymer. The polyalkylene glycol chain-containing thiol polymer of the present invention is a polyalkylene glycol chain-containing thiol polymer, wherein the polymer comprises a polyalkylene glycol chain and a polymer segment bonded to at least one end of the polyalkylene glycol chain with a sulfur atom-containing group therebetween, the polymer segment includes a constitutional unit derived from an unsaturated monomer component, and the unsaturated monomer component includes an unsaturated carboxylic acid monomer and an unsaturated polyalkylene glycol monomer.

Polyalkylene glycol chain-containing thiol polymer, thiol-modified monomer, mixture thereof, and admixture for cement

It is an object of the present invention, which has been made in view of the above-mentioned state of the art, to provide a cement admixture capable of improving the water-reducing ability of cement compositions and the like and enhancing the strength and durability of hardened products produced therefrom and further capable of adjusting the viscosity of such compositions so as to facilitate the works at the sites of handling the same, as well as a method of producing such cement additive. A cement admixture comprising a polycarboxylic acid polymer and a nitrogen atom-containing compound having non-amide bond, wherein the mass ratio (A/B) between the mass (A) of said polycarboxylic acid polymer and the mass (B) of said nitrogen atom-containing compound having non-amide bond satisfies the relation 200&#x3e;(A/B)&#x3e;1.

Cement admixture and production method thereof

It is an object of the present invention to provide a polycarboxylic acid polpolymer which improves the water reducing capacity and workability of cement compositions and the like and making them easier to handle when the fluidity and water reducing capacity are at the same levels, a method of producing the copolymer, and a cement additive and a cement composition comprising the copolymer. The present invention is further to provide a polycarboxylic acid copolymer and a cement additive which are capable of improving the strength and durability of hardening products of cement compositions, hence can advantageously be used in ultrahigh strength concrete. The present invention is polycarboxylic acid copolymers having high water reducing capacity, reducing the viscosity of cement compositions and improving the workability in applying cement. The present invention is directed to a polycarboxylic acid copolymer which is obtained by copolymerization of monomer components comprising a polyalkyleneimine unsaturated monomer (A1) and an unsaturated carboxylic acid monomer (B).

Polycarboxylic acid copolymer, production method and use thereof

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

Disclosed are the following: a cement dispersant which is excellent in initial dispersibility and further in flow retainability of cement, because of using a polymer having a proper molecular weight distribution; a process for producing this cement dispersant; and a cement composition using this cement dispersant. The cement dispersant comprises a water-soluble polymer (P) as a main component, and is characterized by displaying an area proportion (a value (A&#x2212;B) given by subtracting an area ratio B of a lower molecular weight side portion from an area ratio A of a higher molecular weight side portion) in the range of 13 to 60%.

Cement dispersant, its production process, and cement composition using the cement dispersant

It is an object of the present invention to provide a production method of a dehydration reaction product by which the occurrence of troubles in the production step or the degradation in performance characteristics or quality of various chemical products can be suppressed to a satisfactory extent. A production method of a dehydration reaction product

Production process for product of dehydration reaction and apparatus used for the production

The admixtures for a cementitious composition of the invention, which have the above-mentioned constitutions, can suitably be used in cement pastes, mortar, concrete and like cement compositions and can stabilize the amount of air entrained with the lapse of time and thus facilitate the quality control of cement compositions and, further, can improve the workability of cement compositions owing to their excellent dispersing capacities. The cement compositions of the invention which comprise such admixture for a cementitious composition are excellent in water-reducing ability and workability and can give hardened products excellent in strength and durability and, further, can stably maintain the amount of air entrained without allowing increases in the amount of air even when the time of kneading is prolonged in the production.

Cement admixture and cement composition

There is provided: a (meth)acrylic acid (salt) polymer which has high properties and is little colored; and a process which can produce this polymer with a high polymerization conversion without causing the corrosion of the reaction vessel. When a (meth)acrylic acid (salt) polymer is obtained by carrying out polymerization of an unsaturated monocarboxylic monomer (a) and an unsaturated polyalkylene glycolic monomer (b) with a polymerization initiator, either a redox polymerization initiator including hydrogen peroxide and a reducing agent is used as the polymerization initiator in a specific amount, or the unsaturated polyalkylene glycolic monomer is subjected to the polymerization in the form of an esterification reaction product as obtained by a process including the steps of: esterifying the unsaturated monocarboxylic monomer and a polyalkylene glycol in a specific charging ratio in the presence of an acid catalyst in a manner for a portion of the residual unsaturated monocarboxylic monomer as a starting raw material to remain; and then neutralizing the acid catalyst and the residual unsaturated monocarboxylic monomer (a) with a basic substance after the esterification; and the polymerization is carried out under conditions where the pH during the polymerization is in the range of 3.2 to 7.0.

(Meth) acrylic acid (salt) polymer and its production process

It is an object of the present invention to provide a polycarboxylic acid copolymer which improves the water reducing capacity and workability of cement compositions and the like and making them easier to handle when the fluidity and water reducing capacity are at the same levels, a method of producing the copolymer, and a cement additive and a cement composition comprising the copolymer. The present invention is further to provide a polycarboxylic acid copolymer and a cement additive which are capable of improving the strength and durability of hardening products of cement compositions, hence can advantageously be used in ultrahigh strength concrete. The present invention is still further to provide a method of producing polycarboxylic acid copolymers having high water reducing capacity, reducing the viscosity of cement compositions and improving the workability in applying cement. The present invention is directed to a polycarboxylic acid copolymer which is obtained by copolymerization of monomer components comprising a polyalkyleneimine unsaturated monomer (A1) and an unsaturated carboxylic acid monomer (B).

An cross-linked anion exchange resin or a salt thereof obtained by reacting a polymer (A) having amino and/or imino groups in the total number of two or more per molecule with a compound (B) having two or more functional groups capable of reacting with amino and/or imino group contained in the polymer (A). The resin or salt has a water absorption ratio of 4.0 or lower.

Crosslinked anion-exchange resin or salt thereof and phosphorus adsorbent comprising the same

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Osaka, Japan

Tsutomu Yuasa