9 results about "Chloroprene Polymers" patented technology

One embodiment of the present invention relates to a method for producing a chloroprene seed polymer composition, the method comprising a first polymerization step and a second polymerization step, the first polymerization step is a step for obtaining a chloroprene polymer by subjecting at least a chloroprene monomer to emulsion radical polymerization. The second polymerization step is a step in which at least a specific monomer (B-1) or (B-2) is subjected to emulsion seed polymerization with the chloroprene polymer in an amount of 3-20 parts by mass per 100 parts by mass of the total of the chloroprene polymer and the monomer (B-1) or (B-2).

Provided is a method for producing a chloroprene-based polymer composition that supports a high recovery ratio from the polymerization vessel and that makes it possible to obtain dip-molded articles having a low 100% elongation modulus and an excellent tensile strength at break. The present invention provides a method for producing a chloroprene-based polymer composition, wherein the chloroprene-based polymer composition comprises a diene-based polymer A and a chloroprene-based polymer B and the diene-based polymer A and the chloroprene-based polymer B have different weight-average molecular weights. The method for producing this chloroprene-based polymer composition comprises a polymerization step for polymerizing the chloroprene-based polymer B in the presence of the diene-based polymer A.

To provide chloroprene utilizable as a raw material for synthetic rubbers while reducing loads on the environment, to provide a method for producing the chloroprene, and to provide a chloroprene rubber.SOLUTION: According to one aspect of the present invention, there is provided chloroprene, wherein the chloroprene contains a carbon atom derived from biomass.SELECTED DRAWING: None

[Objective] To develop, as an automotive interior material, a chloroprene polymer latex adhesive composition being excellent in terms of both characteristics of adhesiveness to nonpolar materials such as olefins and thermal creep resistance and having favorable storage stability without performing a complicated step. [Solution] An adhesive composition containing a chloroprene polymer latex, containing a chloroprene polymer latex (A), a tackifier (B), and a chlorinated polyolefin resin (C), in which a content rate of a gel component of a chloroprene polymer in the chloroprene polymer latex (A) is more than 0 mass% and 50 mass% or less, the tackifier (B) has a softening point of 85°C or higher, and the chlorinated polyolefin resin (C) has a softening point of lower than 80°C, the tackifier (B) is more than 5 parts by mass and less than 30 parts by mass relative to 100 parts by mass of a solid content of the chloroprene polymer latex (A), the chlorinated polyolefin resin (C) is 6 parts by mass or more and less than 30 parts by mass relative to 100 parts by mass of a solid content of the chloroprene polymer latex (A), and no crosslinking agent is contained.

The present invention provides a chloroprene polymer latex which enables the achievement of a dip-molded article of a chloroprene polymer, the dip-molded article having a sufficient tensile strength at break and excellent texture. The present invention provides a chloroprene polymer latex which contains a chloroprene polymer, wherein: the apparent hardness of a dip-molded article film, which contains the chloroprene polymer latex and has a thickness of 0.60 ± 0.10 mm, is 25.0 IRHD to 40.0 IRHD as measured at 23°C using a Wallace automatic microhardness meter; the dip-molded article film that has a thickness of 0.60 ± 0.10 mm is obtained by stacking a plurality of dip-molded article films that have a thickness of 0.15 mm to 0.25 mm; the dip-molded article films that have a thickness of 0.15 mm to 0.25 mm are obtained by subjecting dip-molded films, which are obtained by dipping ceramic molds to which a calcium-based coagulating solution has been adhered into a chloroprene polymer latex composition that contains the chloroprene polymer latex by means of a dipping coagulation method, to a heat drying process at 150°C for 60 minutes.

The present invention relates to a composition including a chloroprene polymer, a molded body, and a method for producing a molded body, and the composition includes a chloroprene polymer (A), and a thiol compound (B) having 2 mercapto groups in a molecule. An amount of the thiol compound (B) is 1.5 to 20 parts by mass per 100 parts by mass of the chloroprene polymer (A).

This invention provides a chloroprene-based polymer latex composition that yields an adhesive composition with excellent initial adhesive strength, and an adhesive composition containing the chloroprene-based polymer latex composition. According to the invention, a chloroprene-based polymer latex composition is provided, comprising a chloroprene polymer and an aromatic compound having 7 to 10 carbon atoms, wherein the total content of the aromatic compound having 7 to 10 carbon atoms in the aforementioned chloroprene-based polymer latex composition is 0.0001 to 0.0100 parts by mass relative to 100 parts by mass of solid components in the aforementioned chloroprene-based polymer latex composition.

A method for manufacturing a chloroprene polymer composition, the method including: a polymerization step of polymerizing chloroprene in the presence of at least one rosin acid component selected from the group consisting of a rosin acid and a rosin acid salt to obtain a chloroprene polymer composition containing a chloroprene polymer, in which in the rosin acid component, a mass ratio B1 / A1 of a total amount B1 of abietic acid, neoabietic acid, palustric acid, levopimaric acid, and salts thereof with respect to a total amount A1 of dehydroabietic acid, pimaric acid, isopimaric acid, dihydroabietic acid, and salts thereof is 0.10 to 3.00, and a toluene insoluble content of the chloroprene polymer is 50% by mass or more.

Provided is a chloroprene polymer which has high tensile strength at break and a low modulus at 100% elongation, and which makes it possible to obtain a dip-molded product having excellent texture. The present invention provides a chloroprene polymer, wherein the loss tangent tanδ in the 10 Hz frequency region of a film containing the chloroprene polymer, as obtained when the tensile-type dynamic viscoelasticity is measured in accordance with the non-resonant forced vibration technique at a temperature of 25°C and under a strain of 0.75%, is 0.08 to 0.14, and the film is obtained by drying chloroprene polymer latex containing the chloroprene polymer for three days at 23°C or lower.