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    TAPERED BLOCK STYRENE/BUTADIENE COPOLYMERS
    31.
    发明专利
    TAPERED BLOCK STYRENE/BUTADIENE COPOLYMERS 未知

    公开(公告)号：CA2052387C

    公开(公告)日：1996-09-17

    申请号：CA2052387

    申请日：1991-09-27

    Applicant: PHILLIPS PETROLEUM CO

    Inventor： MOCZYGEMBA GEORGE A ,  TREPKA WILLIAM J

    IPC: C08F297/04

    Abstract: A method for preparing tapered block copolymers in a polymerization process by charging an initiator and monomers sequentially with one or more charges of first one of the monomers, then with a mixture of the two monomers, and then with one or more charges of the first monomer to produce a polymodal tapered block copolymer. Suitable monomers include conjugated dienes and monovinylaromatic compounds. The copolymers are particularly useful for applications requiring environmental stress crack resistance.

    33.
    发明专利
    未知

    公开(公告)号：NO944630L

    公开(公告)日：1995-06-06

    申请号：NO944630

    申请日：1994-12-01

    Applicant: PHILLIPS PETROLEUM CO

    Inventor： MOCZYGEMBA GEORGE A ,  KNIGHT NANCY R ,  TREPKA WILLIAM J ,  STACY NATHAN E

    IPC: C08F297/02 ,  C08F297/04

    Abstract: A copolymer is prepd. in a reaction zone by: (a) introducing a monovinylaromatic monomer and an initiator in the presence of a randomiser and polymerising until no free monomer is present; (b) adding an initiator and a monovinylaromatic monomer and polymerising until no free monomer is present; (c) adding a mixt. of monovinylaromatic monomer and conjugated diene and polymerising until no free monomer is present; (d) adding a mixt. of monovinylaromatic monomer and conjugated diene monomer and polymerising until no free monomer is present; (e) adding a conjugated diene monomer and allowing complete polymerisation to occur until no free monomer is present; and (f) adding a coupling agent. Only two initiator charges are present and are added in steps (a) and (b). Also claimed are (i) polymodal copolymers produced by the method; (ii)-articles made from the copolymers, and (ii) a polymodal coupled block copolymer having chains resulting from coupling; S-S-B/S-B/S-B-Li S-B/S-B/S-B-Li S = monovinyl aromatic block; B = conjugated diene block; B/S = tapered B and S block; and Li = living polymer or coupling site.

    Conjugated Diene/Monovinylarene Block Copolymers with Multiple Tapered Blocks
    35.
    发明专利
    Conjugated Diene/Monovinylarene Block Copolymers with Multiple Tapered Blocks 未知

    公开(公告)号：CA2105157A1

    公开(公告)日：1994-05-31

    申请号：CA2105157

    申请日：1993-08-30

    Applicant: PHILLIPS PETROLEUM CO

    Inventor： MOCZYGEMBA GEORGE A ,  STACY NATHAN E ,  KNIGHT NANCY R

    IPC: C08F297/04 ,  C08F297/00

    Abstract: A method for preparing polymodal tapered block copolymers in a polymerization process by sequentially charging: (a) an initiator and monovinylaromatic monomers in the presence of a randomizer; (b) an initiator and monovinylaromatic monomers; (c) a mixture of monovinylaromatic and conjugated diene monomers; (d) a mixture of monovinylaromatic and conjugated diene monomers; (e) an initiator and monovinylaromatic monomers; (f) a mixture of monovinylaromatic and conjugated diene monomers; (g) a mixture of monovinylaromatic and conjugated diene monomers; (h) conjugated diene monomers; and (i) a coupling agent. The copolymers are particularly useful for packaging applications which require good environmental stress crack resistance.

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