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    Continuous production of expandable thermoplastics
    1.
    发明授权
    Continuous production of expandable thermoplastics 失效
    连续生产可膨胀热塑性弹性体

    公开(公告)号：US3676378A

    公开(公告)日：1972-07-11

    申请号：US3676378D

    申请日：1970-03-25

    Applicant: BASF AG

    Inventor： HEIL EDUARD ,  TRIESCHMANN HANS-GEORG ,  WILLERSINN HERBERT ,  BOLTE HERBERT ,  BRONSTERT KLAUS

    IPC: B29C44/34 ,  C08J9/16 ,  C08F47/10 ,  C08F33/02

    CPC classification number: B29C44/461 ,  B29C44/3442 ,  C08J9/16

    Abstract: Continuous production of styrene polymers which contain an expanding agent and which are in the form of granules by extrusion of a mixture of a melt of the polymer with the expanding agent and rapid cooling of the extruded mixture, wherein excess expanding agent is first mixed with the melt and then the excess of expanding agent is evaporated. In this way both the production of a homogeneous mixture and the cooling of the mixture prior to extrusion to temperatures just above the softening point of the mixture are facilitated.

    Abstract translation: 连续生产含有发泡剂的苯乙烯聚合物，并且通过将聚合物的熔体与发泡剂的混合物挤出并挤出混合物的快速冷却而形成颗粒形式，其中过量的膨胀剂首先与 熔化，然后蒸发过量的发泡剂。 以这种方式，促进均匀混合物的生产和在挤出之前将混合物冷却至刚好高于混合物的软化点的温度。

    Continuous production of expanded styrene polymers
    4.
    发明专利
    Continuous production of expanded styrene polymers 未知

    公开(公告)号：GB1092606A

    公开(公告)日：1967-11-29

    申请号：GB1125665

    申请日：1965-03-17

    Applicant: BASF AG

    Inventor： WILLERSINN HERBERT ,  BOLTE HERBERT ,  VOLLMERT BRUNO ,  RUDOLPH GUENTHER

    IPC: C08F6/02 ,  C08F12/08 ,  C08J9/14

    Abstract: Expanded styrene polymers are produced by mixing styrene, or a mixture of at least 80% by weight of styrene with at least one other anionically polymerizable unsaturated monomeric compound, with an organo-alkali metal catalyst and such an amount of dimethyl ether and/or tetrahydrofuran and/or dioxane, in the absence of water and oxygen, that the heat of polymerization liberated during the polymerization of the monomers is sufficient to heat the polymer to a temperature above its softening point and to evaporate the ether, and the polymer obtained is then homogeneously mixed with 2 to 15% by weight of an easily volatile organic halogen compound or a mixture of an easily volatile aliphatic hydrocarbon and a small amount of a compound which will deactivate the organo-alkali metal catalyst, at temperatures above the softening point of the polymer, and the pressure is released. Suitable catalysts are naphthalene sodium, phenyl sodium and butyl lithium, and suitable expanding agents are methyl chloride, propane and butane, the hydrocarbons being used in conjunction with, e.g. oxalic acid or ethylene glycol. Other monomers suitable for copolymerization with the styrene are vinyltoluenes, 1,3-butadiene and isoprene.

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