Abstract: A composition for rubber, including a chloroprene-based polymer latex (A), a metal oxide (B), an antioxidant (C), a surfactant (D) and a pH adjuster (E), and being free of a vulcanization accelerator, in which a tetrahydrofuran (THT) insoluble matter content in a chloroprene-based polymer in the (A) is from 50 mass % to 85 mass %, and in which contents of the (B), the (C), the (D), and the (E) with respect to 100 parts by mass of a solid content of the (A) are from 1 part by mass to 10 parts by mass, from 0.1 part by mass to 5 parts by mass, from 0.1 part by mass to 10 parts by mass, and from 0.01 part by mass to 5 parts by mass, respectively.

Abstract: 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.

Abstract: Disclosed is a chloroprene polymer latex composition for water-based one-liquid 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 the 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 0° C., 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.

Abstract: 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.