41 results about "Chloroprene Polymers" patented technology

Disclosed is a chloroprene polymer latex composition for water-based one-pack type adhesives having well-balanced initial adhesive force, contact properties, storage stability and spray coating properties, characterized by comprising 60-95 mass% (in terms of solid content) of a chloroprene polymer latex (A), 5-40 mass% (in terms of solid content) of an acrylic resin latex (B) containing an acrylic polymer having a glass transition temperature of -50 to 0oC, and 0.02-5 parts by mass (in terms of solid content), per 100 parts by mass (containing water) of the sum of said chloroprene polymer latex (A) and said acrylic resin latex (B), of a surfactant (C) represented by general formula (1): RO-(CH2CH2O)n-SO3M (1) wherein R represents an aliphatic alkyl group having 5 to 20 carbon atoms on average; M represents sodium or ammonium; and n (average) is from 2 to 60.

An object of the invention is to provide a chloroprene polymer composition resistant to discoloration under heat or light. Provided is a chloroprene rubber composition, prepared by carrying out emulsion polymerization in the presence of 0.5 to 7.0 parts by mass of a rosin acid salt as emulsifier and terminating the emulsion polymerization by addition of a polymerization inhibitor and a phosphorus- or phenol-based compound as antioxidant. It is possible according to the invention to obtain a chloroprene polymer composition superior in discoloration resistance under heat or light. The chloroprene polymer composition according to the present invention can be used favorably for adhesion of cloths, leathers, foamed sheets, papers, woods, shoe parts, and others.

The present invention relates to the use of a cyclic ketal, 2-methyl-2-ethyl-1,3-dioxolane as a solvent in adhesives, as well as an adhesive composition comprising said ketal. 2-Methyl-2-ethyl-1,3-dioxolane has high solubilization power of the polychloroprene polymer, forming solutions having high viscosity and having suitable drying time after application of a film onto a surface. Due to the good technical performance, the adhesive composition made according to the present invention is well accepted in the market, finding use to substitute compositions containing toluene or other aromatic and oxygenated solvents.

Provided are a vulcanizate of a chloroprene rubber composition containing carbon black that generates a smaller amount of heat when used and a method for producing the same by a simpler and more convenient method. First, an unvulcanized rubber composition at least containing a chloroprene polymer and carbon black is vulcanization-molded, to give a semivulcanized molded article having a cure characteristic value, as determined by the method specified in JIS K6300-2: 2001, in the range of t10 to t80. Then, the semivulcanized molded article obtained by semivulcanized film-forming step is additionally vulcanized in the state as it is deformed entirely and the deformation is removed, to give vulcanizate in a desired shape.

The present invention relates to an isoprene polymer latex composition that contains a chloroprene polymer latex (A) and an isoprene polymer latex (B); the chloroprene polymer has a Z average particle size of 180 to less than 300 nm and a tetrahydrofuran-insoluble fraction of 80-99 mass%; the chloroprene polymer latex (A) is a copolymer latex of (1) chloroprene (A-1) and 2,3-dichloro-1,3-butadiene (A-2-1) or a copolymer latex of (2) the above (A-1) and (A-2-1) and another monomer (A-2-2), and the copolymer is one obtained by copolymerizing 5.0-30.0 mass% of 2,3-dichloro-1,3-butadiene (A-2-1) per a total of 100 mass% of the monomer components chloroprene (A-1) and 2,3-dichloro-1,3-butadiene (A-2-1). The present invention maintains the quality of the isoprene polymer latex composition, and the properties after crosslinking of a molded product obtained by dipping a dipping former into the composition multiple times do not decline.

A latex of a chloroprene polymer formed from one or more monomers comprising 2-chloro-1,3-butadiene as the main monomer ingredient, characterized in that the solid matter in the polymer latex has a gel content less than 3 mass %, the solid matter in the polymer latex includes a tetrahydrofuran-soluble component having a weight-average molecular weight of from 550,000 to 1,100,000 and a molecular-weight distribution (Mw / Mn) of from 2.0 to 3.1, and the dried solid matter in the polymer latex has a crystallization rate (R) represented by hardness increase at −10° C. (R is the time required for initial hardness (time=0) to increase by 30 points at −10° C. as measured according to JIS-K6301) less than 60 minutes. The chloroprene polymer latex has an excellent balance among initial bond strength, contact adhesion, and water resistance. This latex is useful as an adhesive and can be used in applications where heat resistance of 60° C. or higher, initial bond strength, and contact adhesion are required.

The invention relates to an anti-aging meteorological balloon and a production method thereof. Raw materials of the meteorological balloon include a solid raw material, an oily raw material and an adhesive raw material. The adhesive raw material includes 100 parts by weight of centrifugation-concentrated natural latex. The solid raw material comprises 0.05-0.6 part by weight of an aqueous solutioningredient, 4.5-15 parts by weight of an aqueous dispersion ingredient, and 5-30 parts by weight of chloroprene polymer, wherein the aqueous dispersion ingredient includes 1-2 parts of an antioxidantwingstay L and 1-2 parts of an antiozonant JMT-OZ. The meteorological balloon weighs 2900-3300 g, the length of the balloon body is 4.2-5 m, the width of the handle is 16-19 cm, and the length of thehandle is 12-16 cm. The meteorological balloon can detect meteorological factors of the upper air which is no lower than 40000 m, is excellent in aging resistance, high in lift-off height, and long in service time, and has ozone aging resistance.

The present invention relates to a bridge deck waterproof material and a bridge deck waterproofing method using the same. More specifically, the present invention relates to a bridge deck waterproof material and a bridge deck waterproofing method using the same, for forming a coating layer, which cures in a short time after the application of the bridge deck waterproof material, effectively bonds with the ground surface, and provides excellent durability and water resistance to the bridge deck, on concrete and steel plate bridge decks, thereby preventing deterioration of the bridge deck. The present invention comprises: a lower waterproof material, mixed with 91-95 wt% of 2-ethyl-2-(hydroxymethyl)-1,3-propanediol polymer and 5-9 wt% of admixture, and coated on the bridge deck; a middle waterproof material, mixed with 15-35 wt% of MMA resin, 32.5-42.5 wt% of calcium carbonate, 7.5-17.5 wt% of silica sand No. 3, and 20-30 wt% of silica sand No. 5, and coated on the lower waterproof material; and an upper waterproof material, mixed with 45-55 wt% of 2-chlorobutadiene polymer, 25-35 wt% of toluene or xylene, and 15-25 wt% of sprayed asphalt, and coated on the middle waterproof material.

Provided is a chloroprene-based polymer having an industrially applicable sufficient molecular weight and capable of obtaining a vulcanized rubber excellent in durability and fatigue endurance and an adhesive excellent in layer separation resistance. A chloroprene-based polymer having a number average molecular weight Mn of 150000 to 300000 and comprising a functional group of a structure represented by the general formula (1) or (2) below:(wherein in the general formula (1), R1 shows hydrogen, chlorine, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclyl group.)