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    COUNTER TAPERED THERMOPLASTIC ELASTOMERS
    5.
    发明公开
    COUNTER TAPERED THERMOPLASTIC ELASTOMERS 审中-公开

    公开(公告)号：EP3408325A1

    公开(公告)日：2018-12-05

    申请号：EP17743790.2

    申请日：2017-01-26

    申请人： Dynasol Elastómeros, S.A.de C.V.

    发明人： MOCTEZUMA ESPIRICUETO, Sergio, Alberto ,  MEXICANO GARCÍA, Jesús, Alberto ,  TIERRABLANCA, Maldonado, Elisa ,  HERNÁNDEZ ZAMORA, Gabriel ,  ESQUIVEL DE LA GARZA, Alejandro, Claudio

    IPC分类号： C08L9/06 ,  C08F297/04

    CPC分类号： C08F297/044 ,  C08L95/005 ,  C08L2207/04 ,  C08L2555/84 ,  C09J153/02

    摘要： A counter tapered thermoplastic elastomer composition comprising: (a) a counter tapered diblock A-[A/B] copolymer with a peak molecular weight from 20,000 to 250,000, which includes a monovinyl aromatic homopolymer block A with a peak molecular weight of at least 8,000 and a counter tapered copolymer block [A/B] with a vinyl content of at least 15 weight percent based on the amount of conjugated diene units in the diblock copolymer; and (b) a block copolymer selected from the group consisting of linear triblock copolymers having a peak molecular weight that is at least about 1.5 times the peak molecular weight of the counter tapered diblock A-[A/B] copolymer described In (a), multiarm coupled block copolymers having a peak molecular weight that is at least about 2.5 times the peak molecular weight of the counter tapered diblock A-[A/B] copolymer described in (a), and mixtures thereof; and (c) wherein the ratio of (a) to (b) in the counter tapered thermoplastic elastomer composition is from about 1:5 to about 5:1. The counter tapered thermoplastic elastomer compositions provide in the applications: i) easy processing such as short dispersion time, low mixing temperature, low viscosity, excellent storage stability; and ii) better reinforcement such as high elastic response, wide range of performance grade, high adherence, higher filler loading capacity, and better compromise between high and low temperature properties; which make them suitable for a broad range of applications such as road paving, roofing, shingles, waterproofing membranes, adhesive tapes and labels, contact and sprayable adhesives, and sealants.

    METHOD FOR PRODUCING BUTADIENE-STYRENE BLOCK COPOLYMERS
    7.
    发明公开
    METHOD FOR PRODUCING BUTADIENE-STYRENE BLOCK COPOLYMERS 审中-公开

    公开(公告)号：EP3241855A4

    公开(公告)日：2018-06-27

    申请号：EP14909603

    申请日：2014-12-30

    申请人： PUBLIC JOINT STOCK COMPANY SIBUR HOLDING

    发明人： SITNIKOVA VALENTINA VASILIEVNA ,  MALYGIN ALEXEI VIKTOROVICH ,  RACHINSKY ALEKSEI VLADISLAVOVICH ,  TKACHEV ALEKSEI VLADIMIROVICH ,  BYKHUN YURY YURIEVICH

    IPC分类号： C08F297/04 ,  C08F4/48

    CPC分类号： C08F4/48 ,  C08F212/08 ,  C08F236/06 ,  C08F297/04 ,  C08F297/044

    摘要： The present invention relates to a method for producing butadiene-styrene block copolymers by copolymerisation of styrene and butadiene in a hydrocarbon solvent medium in the presence of an organolithium initiator and a modifier, with subsequent treatment of "living" polymer chains using a coupling agent. The method includes stages wherein, at stage (i), polymerisation of styrene is carried out in the presence of n-butyllithium and a modifier selected from tetrahydrofuran and/or di-C 1 -C 6 -alkyl ethers of ethylene glycol, so as to produce a polystyrene block of "living" polystyryllithium; and at stage (ii), butadiene is added to the reaction mixture obtained at stage (i) and synthesis of a polybutadiene block is carried out, optionally in the presence of a modifier selected from di-C 1 -C 6 -alkyl ethers of diethylene glycol, wherein said modifier is introduced after the beginning of the butadiene polymerisation, so as to produce a "living" block copolymer of polystyrene-polybutadienyllithium. Furthermore, stage (iii) of the claimed method includes treatment of the obtained block copolymer of polystyrene-polybutadienyllithium using a coupling agent, where diphenyldichlorosilane and/or silicon tetrachloride are used as said coupling agent. The technical result of the invention is the production of butadiene-styrene block copolymers with an increased content of 1,2-vinyl units and with a narrow molecular-weight distribution, with a simultaneous reduction in both the consumption of polymerisation modifiers and the time taken to carry out the process.