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    • 6. 发明授权
    • Process for the preparation of binary
.alpha.-methylstyrene/acrylonitrile resins by multi-stage bulk
polymerization
    • 通过多阶段本体聚合制备二元α-甲基苯乙烯/丙烯腈树脂的方法
    • US4795780A
    • 1989-01-03
    • US75775
    • 1987-07-20
    • Frank WinglerKlaus SummermannGerd WassmuthAlfred PischtschanJoachim Doring
    • Frank WinglerKlaus SummermannGerd WassmuthAlfred PischtschanJoachim Doring
    • C08F2/00C08F2/02C08F20/42C08F212/10C08F220/44C08F291/00C08F291/02C08F297/04
    • C08F220/44
    • Process for the preparation of thermoplastic copolymers of .alpha.-methylstyrene and acrylonitrile by continuous bulk copolymerization ofA. 30 to 50 mol % of .alpha.-methylstyrene andB. 70 to 50 mol % of acrylonitrileat temperatures from 60.degree. to 120.degree. C. with average residence times of 4 to 12 hours in the presence of initiators which supply free radicals, carried out in at least two continuously operated mixed tank reactors, characterized in that 100 molar parts of a monomer mixture ofA.sub.0. 34 to 52 mol % of .alpha.-methylstyrene andB.sub.0. 66 to 48 mol % of acrylonitrileare fed continuously into the first tank reactor per unit time, and, with back-mixing, are copolymerized up to a conversion of 5 to 30 molar parts to give a copolymer of the compositionA.sub.1. 49 to 53 mol % of .alpha.-methylstyrene andB.sub.1. 51 to 47 mol % of acrylonitrile,and the mixture consisting of 70 to 95 molar parts of the monomers A and B and 5 to 30 molar parts of the copolymer of the composition A.sub.1 -B.sub.1 is transferred continuously to the second tank reactor and is polymerized there up at a further conversion of 5 to 55 molar parts to a total conversion of 20 to 60 molar parts to give further copolymer of the compositionA.sub.1. 49 to 53 mol % of .alpha.-methylstyrene andB.sub.1. 51 to 47 mol % of acrylonitrile,0,5 to 11.5 molar parts of acrylonitrile being removed from the vapor condenser of the second tank reactor and recycled to the first tank reactor per unit time.
    • α-甲基苯乙烯和丙烯腈的热塑性共聚物的制备方法,通过A.在30℃〜120℃的温度下,将A.30〜50摩尔%的α-甲基苯乙烯和B.70〜50摩尔%的丙烯腈与 在至少两台连续操作的混合罐式反应器中进行自由基引发剂的存在下,平均停留时间为4至12小时,其特征在于,将100摩尔份的A0的单体混合物。 34〜52摩尔%的α-甲基苯乙烯和B0。 将66〜48摩尔%的丙烯腈连续进料到第一罐式反应器中,并且通过反混合共聚至5-30摩尔份的转化率,得到组合物A1的共聚物。 49〜53摩尔%的α-甲基苯乙烯和B1。 丙烯腈为51〜47摩尔%,将由70〜95摩尔份的单体A,B和5〜30摩尔份的组合物A1-B1的共聚物组成的混合物连续地转移到第2槽式反应器中, 在其上进一步转化5至55摩尔份,总转化率为20至60摩尔份,得到组合物A1的其它共聚物。 49〜53摩尔%的α-甲基苯乙烯和B1。 丙烯腈为51〜47摩尔%,丙烷腈为0.5〜11.5摩尔份,从第二罐式反应器的蒸气冷凝器中除去,每单位时间再循环至第一罐式反应器。