Removing residual monomers from nitrile copolymer aq. suspension

    公开(公告)号:IT1166904B

    公开(公告)日:1987-05-06

    申请号:IT2552779

    申请日:1979-09-06

    Abstract: Residual monomer is steam extracted from an aq. suspension of a resin at 100-135 degrees C and 0.35-2.1 kg/cm2 pressure, the resin having been prepd. by free radical polymerisation of an aq. suspension of a mixt. of (A) \-50 wt. % of a nitrile monomer of formula CH2=C(R)CN, where R is H, 1-4C alkyl or halogen and (B) \-1 of (1) styrene, (2) esters of formula CH2=C(R1)COOR2 where R1 is H, 1-4C alkyl or halogen, and R2 is 1-6C alkyl, (3) alpha-olefins of formula CH2=C(R')(R"), where R' and R" are 1-7C alkyl, (4) vinyl ethers comprising (m)ethyl, propyl and butyl vinyl ethers, (5) vinyl acetate and (6) indene. Pref. (A) is acrylonitrile and (B) is styrene or methyl acrylate.

    PROCESS FOR MAKING A POLYMER OF ACRYLONITRILE, METHACRYLONITRILE AND OLEFINICALLY UNSATURATED MONOMERS

    公开(公告)号:CA2134823A1

    公开(公告)日:1995-05-11

    申请号:CA2134823

    申请日:1994-11-01

    Abstract: Title: A PROCESS FOR MAKING A POLYMER OF ACRYLONI TRILE, METHACRYLONITRILE AND OLEFINICALLY UNSATURATED MONOMERS A process for making a thermally stable melt processable acrylonitrile/methacrylonitrile/olefinically unsaturated multipolymer, comprising polymerizing a mixture of acrylonitrile monomer, methacrylonitrile monomer, and olefinically unsaturated monomer in which the rate of addition of the multimonomer mixture isset by the rate of polymerization so that the concentration of unreacted acrylonitrile monomer, unreacted methacrylonitrile monomer and unreacted olefinically unsaturated monomer is low and the polymerization process is in a monomer starved condition.

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