Abstract: In the preparation of polyarylene sulfide (PAS) by reacting an alkali metal sulfide with a dihaloaromatic compound in an organic amide solvent to obtain a polyarylene sulfide slurry and subjecting the slurry to acid treatment, an acid or hydrogen salt is added to the slurry in such an amount that a pH of the slurry is more than 7.0 and at most 11.0 to carry out the acid treatment. Alternatively, a zinc compound in an amount of 0.1 to 1.5 mole % per mole of the alkali metal sulfide supplied is added to the polyarylene sulfide slurry to treat the slurry, and, then, an acid or hydrogen salt in an amount of at least 0.2 mole % per mole of the alkali metal sulfide supplied is added. The PAS thus obtained has high crystallization speed, high whiteness, high mechanical strength and high melt viscosity, V6.

Abstract: In the preparation of polyarylene sulfide (PAS) by reacting an alkali metal sulfide with a dihaloaromatic compound in an organic amide solvent to obtain a polyarylene sulfide slurry and subjecting the slurry to acid treatment, an acid or hydrogen salt is added to the slurry in such an amount that a pH of the slurry is more than 7.0 and at most 11.0 to carry out the acid treatment. Alternatively, a zinc compound in an amount of 0.1 to 1.5 mole % per mole of the alkali metal sulfide supplied is added to the polyarylene sulfide slurry to treat the slurry, and, then, an acid or hydrogen salt in an amount of at least 0.2 mole % per mole of the alkali metal sulfide supplied is added.

Abstract: A resin composition is provided which composition comprises 100 parts by weight of (A) polyarylene sulfide, and 0.01 to 5.0 parts by weight of (B) a product compound of an element selected from the group consisting of group IIA and group IIB of the periodic table, wherein said product compound has such alkalinity that a mixture of said product compound with a 20-fold weight of ultrapure water of grade A4 specified in the Japanese Industrial Standards (JIS) K0557 has a pH of from 10.0 to 12.0. The composition is particularly suited to be used for an optical instrument part such as an object lens driving unit and the like.

Abstract: A melt-blown, non-woven fabric constituted by extremely fine polyarylene sulfide fibers having an average fiber diameter of 10 &mgr;m or less is stably produced from branched and/or cross-linked polyarylene sulfide having a non-Newtonian coefficient of 1.05-1.20.

Abstract: A particle size of polyarylene sulfide obtained in polymerization is controlled by a process characterized in that a gaseous phase part of a reactor is cooled or heated after starting decreasing a temperature of a reaction system o an end of precipitation of polyarylene sulfide formed In an embodiment, a water content in the reaction system is 0.8 to 1.

Abstract: The object is to provide a promoting agent for bone formation, a therapeutic method for bone formation and a process for preparing a promoting agent for bone formation. A promoting agent for bone formation which comprises at least one of kistrin, echstatin, a peptide or polypeptide containing the amino acid sequence ArgGlyAsp in the molecule such as a peptide represented by Gly-Arg-Gly-Asp-Ser or a compound represented by the following general formula (IX) and so on, as well as a biologically acceptable salt thereof wherein R16 represents —N(R20)2 (R20 represents a hydrogen atom or a C1-C4 alkyl group), R17 represents a hydrogen atom or a C1-C4 alkyl group, R18 represents a hydrogen atom, a C1-C4 alkyl group and so on, R19 represents OH, NH2 and so on, Y represents —NH—, —O— or a direct bond, a represents 1-3, b represents 1 or 2, c represents 0 or 1 and d represents 0 or 1.

Abstract: The object is to provide a promoting agent for bone formation, a therapeutic method for bone formation and a process for preparing a promoting agent for bone formation. A promoting agent for bone formation which comprises at least one of kistrin, echstatin, a peptide or polypeptide containing the amino acid sequence ArgGlyAsp in the molecule such as a peptide represented by Gly-Arg-Gly-Asp-Ser or a compound represented by the following general formula (IX) and so on, as well as a biologically acceptable salt thereof wherein R16 represents —N(R20)2 (R20 represents a hydrogen atom or a C1-C4 alkyl group), R17 represents a hydrogen atom or a C1-C4 alkyl group, R18 represents a hydrogen atom, a C1-C4 alkyl group and so on, R19 represents OH, NH2 and so on, Y represents —NH—, —O— or a direct bond, a represents 1-3, b represents 1 or 2, c represents 0 or 1 and d represents 0 or 1.

Abstract: A simple and convenient process is provided to introduce a sufficient quantity of functional groups to a main chain or terminals of the chain of a polyarylene sulfide resin to improve properties of the resin.The invention provides a process for heat oxidation crosslinking a polyarylene sulfide resin, characterized by conducting the heat oxidation crosslinking reaction in the presence of at least one organic compound having at least one active-hydrogen-containing group or at least one organic compound having at least one active-hydrogen-containing group and a group derived from an active hydrogen containing group by substituting an active hydrogen of the active hydrogen containing group with an alkali metal, to thereby prepare a functional group-containing polyarylene sulfide resin.

Abstract: Polyarylene sulfide (PAS) is disclosed, of which extract with methylene chloride is in an amount of not more than 0.7% by weight, a melt viscosity V.sub.6 is 20 to 15,000 poises and a content of --SX groups is at least 15 micro moles/g, wherein X represents an alkali metal or a hydrogen atom. The PAS is prepared as follows: an alkali metal sulfide is reacted with a dihaloaromatic compound in an organic amide solvent, while a part of a gaseous phase in a reactor is condensed by cooling a gaseous phase part of the reactor to return the condensed liquid to a liquid phase; and the polyarylene sulfide thus prepared is washed with an organic solvent and then with water. The present invention also provides a composition comprising 100 parts by weight of (A) the aforesaid PAS and 0.01 to 5.0 parts by weight of (B) at least a silane compound selected from the group consisting of methacryloxysilane compounds, ureidosilane compounds and epoxy silane compounds.

Abstract: A polyarylene sulfide in which a ratio of terminal --SX groups to a total of the terminal --SX groups and --SZn-- groups is less than 20 mole %, wherein X represents an alkali metal or a hydrogen atom, and which has a melt viscosity, V.sub.6 of 100 to 2,000 poises.Also disclosed are a composition comprising 100 parts of the above polyarylene sulfide, 0.01 to 20 parts of zeolite and 0.01 to 20 part of silica, and a process for the preparation of the above polyarylene sulfide.

Abstract: A tubular extrusion molding product comprising a high molecular weight polyarylene sulfide having a melt viscosity of from 3,100 poise to 60,000 poise produced by reacting an alkali metal sulfide and a dihaloaromtic compound in the presence of an organic amide solvent, cooling a gaseous phase part in the reaction zone during the reaction thereby condensating at least a part of the gaseous phase and refluxing the resultant condensate to a liquid phase in the reaction zone. A tubular extrusion molding product having further improved impact resistance can be provided by copolymerizing from 0.2 mol % to 1 mol % of a polyhaloaromatic compound to the alkali metal sulfide. A tubular extrusion molding product of improved impact resistance is provided by further applying a heat treatment of the polyarylene sulfide intermediate product thereby increasing the melt viscosity.

Abstract: A therapeutic agent for osteoporosis comprising as an active ingredient xanthohumol. Xanthohumol obtained from hop extracts has a bone resorption inhibiting activity and is useful as a therapeutic agent for osteoporosis.

Abstract: A particle size of potyarylene sulfide obtained in polymerization is controlled by a process characterized in that a gaseous phase part of a reactor is cooled or heated after starting decreasing a temperature of a reaction system o an end of precipitation of polyarylene sulfide formed In an embodiment, a water content in the reaction system is 0.8 to 1.7 moles per mole of the alkali metal sulfide; the gaseous phase part of the reactor is cooled in a polymerization stage to thereby condense a part of a gaseous phase in the reactor and the condensed liquid is refluxed to a liquid phase in the reactor; and the gaseous phase part is only cooled after starting decreasing the temperature of the reaction system, whereby high molecular weight polyarylene sulfide suitable for powder coating is formed, which has a weight average molecular weight of at least 30,000 and an average particle size of 50 to 80 .mu.m, wherein particles of 40 to 150 .mu.

Abstract: Substituted aminoethane-1,1-bisphosphonic acids and aminoethane-1,1-alkylphosphinophosphonic acids, processes for their preparation and use thereofThe invention relates to compounds of the formula I ##STR1## in which R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are a hydrogen atom or (C.sub.5 -C.sub.5)-alkyl, m is the integer 0 or 1, x is (C.sub.1 -C.sub.10)-alkyl, mono- or polysubstituted, a 5- or 6-membered ring having one nitrogen atom and optionally a further nitrogen or oxygen atom; aryl having 6 or 10 carbon atoms, which can be substituted; or cycloalkyl, to processes for the preparation of the compound of the formula I; to pharmaceuticals, and to their use for the treatment of osteoporosis and degenerative joint diseases.

Abstract: High molecular weight polyarylene sulfide prepared by reacting an alkali metal sulfide with a dihaloaromatic compound in an organic amide solvent, wherein a gaseous phase part of a reactor is cooled to thereby condense a part of a gaseous phase in the reactor, and the condensed liquid is refluxed to a liquid phase in the reactor. Higher molecular weight is attained by copolymerization with 0.005 to 1.5 mole percent, based on the alkali metal sulfide, of a polyhaloaromatic compound.