Polysaccharide derivatives and hydraulic compositions

Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing

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1061621, 10616301, 1061721, 1061751, 1062021, 1062031, 10620501, 1062052, 1062056, 1062057, 1062061, 1062101, 1062131, 1062152, 106724, 106725, 106726, 106729, 106730, 106802, 106805, 106823, 536 85, 536 91, 536 92, 536 95, 536 96, 536102, 536114, 536122, 5361231, 536124, C08B 1104, C08B 3700, C04B 2438, C04B 2628

Patent

active

060686979

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The present invention relates to a novel polysaccharide derivative, particularly one which forms an aqueous solution excellent in transparency and thickening effects even at a low concentration and reduced in the viscosity change caused by the coexistence of a metal salt or a temperature change, thus exhibiting excellent flowability, and a process for the preparation thereof. The present invention relates also to an admixture for the production of extruded articles. Specifically, it relates to an admixture which imparts suitable plasticity for extrusion to a plastic cement composition prepared by mixing a cementitious material as the major component with water to thereby enable the production of an extruded plate excellent in shape retention through the formation of smooth surfaces without causing crushing, and to a cement composition containing the admixture. The present invention relates also to an additive for gypsum-based adhesives excellent in adhesiveness and to a gypsum-based adhesive containing this additive. More specifically, it relates to an additive for gypsum-based adhesives mainly comprising cementitious materials such as hemihydrate gypsum which is effective in enhancing the adhesive bonding of a gypsum molding to a substrate and to an adhesive composition containing the additive. The present invention relates also to an additive for mortar and to a mortar composition containing the additive. More specifically, it relates to an additive for various mortars to be used in wooden buildings, concretebuildingsorthelikeas substrate, finishor the like, which additive can give a mortar composition excellent in the capability of plastering and extremely reduced in the delay of setting or development of strength. The present invention relates also to an additive for high-flowability hydraulic compositions which need not be compacted, a hydraulic composition containing this additive, and a hardened product of the composition. More specifically, it relates to an additive for hydraulic compositions which can increase the viscosity and flowability of concrete, mortar and cement paste used as civil engineering and building materials and the materials for secondary products and can protect the compositions from the segregation caused among aggregate, cement and water. The hydraulic composition containing this additive need not be compacted with a vibrator or the like and exhibits excellent hardening characteristics in placing.


BACKGROUND ART

Cellulose ethers are somewhat superior to polyacrylate thickeners such as Carbopol in the viscosity stability of an aqueous solution thereof with an inorganic or organic metal salt. However, cellulose ethers had disadvantages such that their thickening effects were poorer than those of polyacrylate thickeners at the same concentration, and that the viscosity of a hydraulic composition containing cellulose ether as the thickener or dispersant remarkably changed with the temperature.
JP-A 55-110103 and JP-A 56-801 disclose that hydrophobic nonionic cellulose derivatives prepared by partially introducing C.sub.10 -C.sub.24 long-chain alkyl groups into nonionic water-soluble cellulose ethers exhibit relatively high thickening effects even when used in small amounts. Further, attempts to apply such alkylated cellulose derivatives to pharmaceutical preparations for external use, cosmetics and so on are disclosed in JP-A 3-12401, JP-A 3-141210, JP-A 3-141214 and JP-A 3-218316. However, these alkylated cellulose derivatives had problems that they were poor in water solubility, so that it took a long time to dissolve the derivatives homogeneously and that the viscosity of the resulting aqueous solution significantly changed with of time, though they were superior to the above cellulose ethers in thickening effects.
As described above, the cellulose ethers and alkylated cellulose derivatives according to the prior art could not satisfy all of the requirements for the ideal thickener for building materials and so on, i.e., easy dissolution, excellent thickening effec

REFERENCES:
patent: H493 (1988-07-01), Tegiacchi et al.
patent: 5385607 (1995-01-01), Kiesewetter et al.
patent: 5573589 (1996-11-01), Tanaka et al.
patent: 5707445 (1998-01-01), Yamato et al.
Analysis of Acrylic Polymers Using Combined Zeisel Reaction-Gas Chromatography and Infrared Spectrometry, D.G. Anderson et al, Analytical Chemistry, vol. 43, No.7, Jun. 1971, pp. 894-900.

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