To provide a statistical copolymer containing a chloroprene monomer unit and an unsaturated nitrile monomer unit which has a satisfactory oil resistance. A method for producing a statistical copolymer containing a chloroprene monomer unit and an unsaturated nitrile monomer unit includes a step for conducting continuous addition or 10 cycles or more of intermittent portionwise addition of the chloroprene monomer after initiation of a polymerization reaction is provided. A rubber composition using a statistical copolymer according to the invention or a vulcanized molded article containing the rubber composition is excellent in terms of oil resistance, mechanical strength, compression set at a low temperature and flex fatigue resistance.

To provide a statistical copolymer containing a chloroprene monomer unit and an unsaturated nitrile monomer unit which has a satisfactory oil resistance. A method for producing a statistical copolymer containing a chloroprene monomer unit and an unsaturated nitrile monomer unit includes a step for conducting continuous addition or 10 cycles or more of intermittent portionwise addition of the chloroprene monomer after initiation of a polymerization reaction is provided. A rubber composition using a statistical copolymer according to the invention or a vulcanized molded article containing the rubber composition is excellent in terms of oil resistance, mechanical strength, compression set at a low temperature and flex fatigue resistance.

The present invention relates to a polychloroprene latex composition, a dip-molded product, a pressure-sensitive adhesive, an adhesive, and an adhesive product. The polychloroprene latex composition contains a chloroprene (co)polymer (A) and an aromatic compound (B) having 7 to 10 carbon atoms, and the polychloroprene latex composition has a proportion of the aromatic compound (B) having 7 to 10 carbon atoms of 0.0012 to 0.15 parts by mass based on 100 parts by mass of solid content of the polychloroprene latex composition.

The present invention relates to a polychloroprene latex composition, a dip-molded product, a pressure-sensitive adhesive, an adhesive, and an adhesive product. The polychloroprene latex composition contains a chloroprene (co)polymer (A) and an aromatic compound (B) having 7 to 10 carbon atoms, and the polychloroprene latex composition has a proportion of the aromatic compound (B) having 7 to 10 carbon atoms of 0.0012 to 0.15 parts by mass based on 100 parts by mass of solid content of the polychloroprene latex composition.

A chloroprene-based polymer, wherein: a 1H-NMR spectrum of the chloroprene-based polymer measured in a deuterochloroform solvent has a peak at 5.80 to 6.00 ppm; when an area of the peak at 5.80 to 6.00 ppm is A and an area of a peak at 4.05 to 6.00 ppm is B, A/B is 1.20/100 or less; the 1H-NMR spectrum of the chloroprene-based polymer measured in a deuterochloroform solvent has a peak at 5.40 to 5.60 ppm; when an area of the peak at 5.40 to 5.60 ppm is D and the area of the peak at 4.05 to 6.00 ppm is B, D/B is 97.20/100 or less, is provided.

A chloroprene-based polymer, wherein: a 1H-NMR spectrum of the chloroprene-based polymer measured in a deuterochloroform solvent has a peak at 5.80 to 6.00 ppm; when an area of the peak at 5.80 to 6.00 ppm is A and an area of a peak at 4.05 to 6.00 ppm is B, A/B is 1.20/100 or less; the 1H-NMR spectrum of the chloroprene-based polymer measured in a deuterochloroform solvent has a peak at 5.40 to 5.60 ppm; when an area of the peak at 5.40 to 5.60 ppm is D and the area of the peak at 4.05 to 6.00 ppm is B, D/B is 97.20/100 or less, is provided.

A chloroprene-based polymer latex including a chloroprene-based polymer, wherein: an amount of substance of alkali metal cation per unit mass in the chloroprene-based polymer latex is 0.05 to 0.12 mmol/g, when the chloroprene-based polymer latex is freeze-dried to obtain a solid content containing the chloroprene-based polymer, and an ethanol-toluene azeotropic mixture soluble content specified in JIS K 6229 is extracted by refluxing from the solid content to obtain an extract, and the obtained extract is acid treated with hydrochloric acid, an amount of rosin acid of in the solid content measured by gas chromatography is 1.4 to 4.2% by mass with respect to 100% by mass of the chloroprene-based polymer in the solid content, is provided.

A chloroprene-based polymer latex including a chloroprene-based polymer, wherein: an amount of substance of alkali metal cation per unit mass in the chloroprene-based polymer latex is 0.05 to 0.12 mmol/g, when the chloroprene-based polymer latex is freeze-dried to obtain a solid content containing the chloroprene-based polymer, and an ethanol-toluene azeotropic mixture soluble content specified in JIS K 6229 is extracted by refluxing from the solid content to obtain an extract, and the obtained extract is acid treated with hydrochloric acid, an amount of rosin acid of in the solid content measured by gas chromatography is 1.4 to 4.2% by mass with respect to 100% by mass of the chloroprene-based polymer in the solid content, is provided.

Essentially ETU-free cross linkable compositions comprising chloroprene rubber, a cross-linker and a vulcanization accelerator, which have a defined content of ions from the second or third main group and resinate anions and thus possesses improved curing characteristics, a process for vulcanization of such compositions and vulcanizates obtained thereby.

Essentially ETU-free cross linkable compositions comprising chloroprene rubber, a cross-linker and a vulcanization accelerator, which have a defined content of ions from the second or third main group and resinate anions and thus possesses improved curing characteristics, a process for vulcanization of such compositions and vulcanizates obtained thereby.