CHLOROPRENE POLYMER COMPOSITION, DIP-MOLDED ARTICLE, AND METHOD FOR PRODUCING SAID COMPOSITION AND ARTICLE

    公开(公告)号:US20240034862A1

    公开(公告)日:2024-02-01

    申请号:US18256692

    申请日:2021-10-01

    CPC classification number: C08L9/00 C08J5/02

    Abstract: A method for producing a chloroprene polymer composition containing a chloroprene polymer, the method including: a polymerization step of polymerizing a monomer containing chloroprene at a polymerization rate of 20% or more to obtain a polymer composition containing a chloroprene polymer; and a mixing step of mixing the polymer composition with a rosin containing at least one conjugate resin acid component selected from the group consisting of abietic acid, neoabietic acid, palustric acid, levopimaric acid, and salts thereof, in which a mixed amount of the rosin in the mixing step is more than 0 parts by mass and 23 parts by mass or less with respect to 100 parts by mass of solid content of the polymer composition.

    CROSS-COPOLYMER AND MEDICAL SINGLE-LAYER TUBE INCLUDING SAME

    公开(公告)号:US20190077893A1

    公开(公告)日:2019-03-14

    申请号:US16064703

    申请日:2016-10-25

    Abstract: [Problem] To provide a cross-polymer having excellent softness, tensile properties, transparency and anti-blocking properties, and a medical single-layer tube using the same. [Solution] A cross-copolymer containing, by 75-95 mass %, main chains comprising aromatic vinyl/olefin-based copolymers comprising 8.99-15.99 mol % of aromatic vinyl monomer units, 84-91 mol % of olefin monomer units and 0.01-0.5 mol % of aromatic polyene monomer units; and by 5-25 mass %, cross-chains comprising polymers comprising aromatic vinyl monomer units; wherein, based on differential scanning calorimetry (DSC) in which the cross-copolymer is cooled to −50° C. in a 30 mL/min nitrogen flow, then heated to 180° C. at a temperature increase rate of 10° C./min, re-cooled to −50° C., and heated to 180° C. at a temperature increase rate of 10° C./min, the cross-copolymer has a top temperature of melting peak of 60-80° C., and a heat of fusion of 45-75 J/g, as calculated from the area of the DSC curve between −20° C. and 130° C. by using a straight line drawn between points on the DSC curve at −20° C. and 130° C.

    CHLOROPRENE-BASED BLOCK COPOLYMER, LATEX, LATEX COMPOSITION, AND RUBBER COMPOSITION

    公开(公告)号:US20230074040A1

    公开(公告)日:2023-03-09

    申请号:US17788994

    申请日:2021-03-22

    Abstract: A chloroprene-based block copolymer, a latex, a latex composition, and a rubber composition that can produce a product with excellent tensile properties and flexibility without the use of a vulcanizing agent or a vulcanizing accelerator having a chloroprene-based block copolymer, contains 5 to 30% by mass of a polymer block (A) and 70 to 95% by mass of a chloroprene-based polymer block (B), wherein the polymer block (A) is derived from a monomer, when the monomer is polymerized alone, a polymer with a glass transition temperature of 80° C. or higher can be obtained and the chloroprene-based polymer block (B) includes a chloroprene monomer unit and a polyfunctional monomer unit.

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