STYRENIC BLOCK COPOLYMERS AND METHODS OF PREPARATION THEREOF

    公开(公告)号:EP4234593A1

    公开(公告)日:2023-08-30

    申请号:EP23157960.8

    申请日:2023-02-22

    摘要: A hydrogenated styrenic block copolymer (HSBC) is disclosed comprising, prior to hydrogenation, a polymer block A of at least one vinyl aromatic monomer, a polymer block B of at least one conjugated diene, and a copolymer block C of at least one vinyl aromatic monomer and 1,3-butadiene monomer. The HSBC has a total vinyl aromatic content of 15 to 60 wt.% and an aromatic blockiness index of 20 to 80%. The viscoelastic properties of HSBC show a value of a tan δ peak height of 0.7 to 2, a tan δ peak temperature of -40 to 25°C, and a temperature width value (in °C) at half the tan δ peak height of 17 to 40. The HSBC provides improved mechanical properties and can be used in preparation of adhesives and protective films applications.

    HOT MELT ADHESIVE COMPOSITION
    10.
    发明公开

    公开(公告)号:EP4186956A1

    公开(公告)日:2023-05-31

    申请号:EP21306662.4

    申请日:2021-11-30

    申请人: Bostik SA

    摘要: The invention concerns a hot melt adhesive composition comprising:
    i) a first metallocene-catalyzed propylene-based copolymer;
    ii) a second metallocene-catalyzed propylene-based copolymer;
    iii) a polyolefin copolymer selected from the group consisting of:
    iii-1) acid-grafted polyolefin copolymer;
    iii-2) a copolymer based on olefins and unsaturated monomers containing acid groups or anhydride groups; and
    iii-3) mixtures thereof;

    iv) a tackifier;
    v) optionally a third metallocene-catalyzed propylene-based copolymer; wherein each of the metallocene-catalyzed propylene-based copolymers i) and ii) comprises, independently of each other, from 1% to 20% by weight of ethylene units.