Sumitomo Chemical Company, Limited

Daikin Industries, Ltd.

Bridgestone Tire Company Limited

Japan Synthetic Rubber Co., Ltd.

G-c Dental Industrial Corp.

Noboru Yamazaki

Fukuji Higashi

Hiroshi Inukai

Toshiharu Yagi

Shigeaki Kurata

Seisuke Tomita

Akira Yamanaka

Seiichi Nakahama

Kazuo Yamaguchi

Shigeaki Kuratas

Michio Okuyama

In an adhesive composition for biomaterial use, a composition characterized by comprising as a main component a compound represented by the formula ##STR1## wherein A is H, F or CH.sub.3, B is fluoralkyl group having 1 to 20 carbon atoms.

Adhesive composition for biomaterial use

A dental material comprising a copolymer which comprises at least 10% by weight of a polymeric unit of at least one of the following monomers: ##STR1## wherein R.sup.1 and R.sup.2 are each H, CH.sub.3 or CF.sub.3, R.sup.3 is H, CH.sub.3 or F, A is --CH.sub.2 --, --CH.sub.2 CH.sub.2 --, --CH.sub.2 CH(CH.sub.3)--, --CH(OH)--, --CH.sub.2 CH(OH)CH.sub.2 --, --CH(OCOCH.sub.3)--or --CH.sub.2 CH(OCOCH.sub.3 (CH.sub.2 --, A' is the same group as A or --CH.sub.2 CH.sub.2 CH.sub.2 --, 2 is an alkylene group having 2 to 10 carbon atoms, m and n are each zero or a number of 1 to 5, p is a number of 1 to 3, q is a number of 1 to 5, provided that at least one of R.sup.1 and R.sup.2 is CF.sub.3 when R.sup.3 is H or CH.sub.3.

Dental material

A dental resin composition comprising (a) a siloxane polymer obtained by polymerizing an oligomer comprising (I) a silane compound containing therein an ethyleneically unsaturated group having bonded thereto (II) a silane compound containing therein a phenyl group or an alkyl group, (b) a monomer copolymerizable with said siloxane polymer (a), and (c) a polymerization catalyst, and optionally, (d) a filler, is disclosed. The dental resin composition of the invention is markedly improved in physical properties such as compressive strength, bending strength, abrasion resistance, and water sorption and therefore, it is quite useful as a denture base resin, a crown and bridge resin, and a filling resin in the dentistry.

Dental resin composition

A steel cord futed pneumatic tire having improved durability is disclosed. In this tire, a coating rubber for the belt and/or carcass ply comprises a rubber composition containing 2 to 10 parts by weight of a polysulfide polymer having the following general formula (I):

Pneumatic tires having improved durability

A cyclic sulfur compound represented by the formula, ##STR1## wherein R is --CH.sub.2 CH.sub.2 O).sub.n CH.sub.2 CH.sub.2 --, m is an integer of 2 to 4 and n is an integer of 1 to 3 is novel and can be used as a crosslinking agent instead of sulfur per se and also as a monomer for preparing polysulfide polymer. Said cyclic sulfur compound can be produced by reacting a metal sulfide represented by the formula, ##STR2## wherein R is the same as defined above, R' and R' are independently selected from alkyl groups and aryl groups and M is silicon or tin, with a halogen, sulfur dichloride or sulfur monochloride.

Cyclic sulfur compounds

The amidation and esterification of carboxylic acids with amines and hydroxyl group-containing compounds, respectively, are effected without incurring the drawbacks of reaction equilibrium by the reaction of the reactants, one of which has been activated in the reactive group by contact with a phosphonium salt obtained by reacting a phosphorous ester or phosphorous monoester salt with an organic base such as pyridine and an oxidizing agent such as halogens and mono or divalent mercury halide or acetate. The amidation can be applied to the preparation of peptides by the reaction of amino acids and/or peptides in which one of the reactive groups have been protected.

Phosphonium salt and its use

Esterification of carboxylic acids by contact with a phosphonium salt

Aromatic polyamides having high polymerization degree are produced by polycondensing an arylene containing aminocarboxylic acid, or a dicarboxylic acid with an aromatic diamine in the presence of a phosphorus compound, a tertiary amine and a metal halide using N-methylpyrrolidone and/or dimethylacetamide as a solvent.

Production of aromatic polyamides from dicarboxylic acid and diamine

Aromatic polyamides having high polymerization degree are produced by polycondensing an arylene-containing aminocarboxylic acid, or a dicarboxylic acid with an aromatic diamine in the presence of a phosphorus compound, a tertiary amine and a metal halide using N-methylpyrrolidone and/or dimethylacetamide as a solvent.

Production of aromatic polyamides

The amidation and esterification of carboxylic acids with amines and hydroxyl group-containing compounds, respectively, are effected without incurring the drawbacks of reaction equilibrium by the reaction of the reactants, one of which has been activated in the reactive group by contact with a phosphonium salt obtained by reacting a phosphorous ester or phosphorous monoester salt with an organic base such as pyridine and an oxidizing agent such as halogens and mono or divalent meercury halide or acetate. The amidation can be applied to the preparation of peptides by the reaction of amino acids and/or peptides in which one of the reactive groups have been protected.

Polyamides are produced by reacting a dicarboxylic acid with a diamine or polycondensing an amino acid in the presence of a phosphorous acid ester of the formula, R.sup.3.R.sup.4.HPO.sub.3, wherein R.sup.3 and R.sup.4 may be the same or different and are individually an alkyl, aralkyl or aromatic group which may have at least one substituent, such as diphenyl phosphite, and an organic base such as pyridine.

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Tokyo, Japan

Noboru Yamazaki