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    3.
    发明专利
    未知

    公开(公告)号：DE1494960A1

    公开(公告)日：1969-12-18

    申请号：DE1494960

    申请日：1964-04-01

    Applicant: BASF AG

    Inventor： ERHARD STAHNECKER DR ,  JOHANNES GROHMANN DR

    IPC: C08J9/224 ,  C08F47/08

    Abstract: An expandable synthetic resin composition has the form of fine particles containing a styrene polymer and an expanding agent, wherein the particles of the styrene polymer, containing the expanding agent are coated with 0.01 to 0.4% by weight (with reference to the styrene polymer) of an aqueous dispersion of another vinyl polymer or a vinylidene polymer and evaporating off the water. The styrene polymer, e.g. in bead form, may contain up to 50% of a copolymerizable monomer, e.g. a -methyl styrene, chlorostyrenes, acrylonitrile, esters of acrylic or methacrylic acid, vinylcarbazole, butadiene, divinylbenzene or butanediol diacrylate, and the coating may suitably be a polymer or copolymer of vinyl propionate or acetate, methyl or ethyl acrylate, maleic anhydride, vinyl chloride or vinylidene chloride and may contain dimethyl phthalate. The expanding agent may be pentane, hexane, butane, propane, dichlorodifluoromethane, trichlorotrifluoroethan or methyl chloride.ALSO:An expandable synthetic resin composition has the form of fine particles containing a styrene polymer and an expanding agent, wherein the particles of the styrene polymer containing the expanding agent are coated with 0.01 to 0.4% by weight (with reference to the styrene polymer) of another vinyl polymer or a vinylidene polymer and evaporating off the water. The styrene polymer may contain up to 50% of a copolymerisable monomer, e.g. a -methyl styrene, chlorostyrenes, acrylonitrile, esters of acrylic or methacrylic acid, vinylcarbazole, butadiene, divinylbenzene or butanediol diacrylate, and the coating may suitably be a polymer or copolymer of vinyl propionate or acetate, methyl or ethyl acrylate, maleic anhydride, vinyl chloride or vinylidene chloride. The particles are coated from aqueous dispersions.

    4.
    发明专利
    未知

    公开(公告)号：DE1494934A1

    公开(公告)日：1969-07-17

    申请号：DE1494934

    申请日：1963-02-19

    Applicant: BASF AG

    Inventor： ERHARD STAHNECKER DR

    IPC: C08J9/00 ,  C08J9/20 ,  C08K5/00

    Abstract: A self-extinguishing expandable plastics composition comprises (A) a thermoplastic styrene copolymer which contains 95 to 99.5% by weight of styrene and 0.5 to 5.0% by weight of acrylonitrile or at least 80% by weight of styrene, 0.5 to 5.0% by weight of acrylonitrile and not more than 15% by weight of one or more other monomeric polymerizable a ,b -unsaturated compounds, (B) an organic bromine compound having a bromine content of more than 50% by weight, the amount of the bromine compound being such that the bromine content of the mixture (with reference to the styrene copolymer) is from 0.5 to 6.0% by weight and (c) 2 to 20% by weight (with reference to the styrene copolymer) of an expanding agent which is liquid or gaseous at room temperature, which does not dissolve the copolymer and which has a boiling point of less than 100 DEG C. Compositions which contain a copolymer of 99-97% by weight of styrene and 1-3% by weight of acrylonitrile have particularly advantageous properties in respect of little shrinkage. Polymerizable monomeric a ,b -unsaturated compounds which may be used in addition to styrene and acrylonitrile include esters of acrylic and methacrylic acids with alcohols having one to eight carbon atoms, nuclear halogenated styrenes, nuclear alkylated styrenes and divinylbenzene. Organic bromine compounds used are brominated polymers of butadiene or isoprene having a degree of polymerization of 2 to 20, such as octabromohexadecane, tetrabromocyclooctane, hexabromocyclododecane, tetrabromocyclododecane; esters and acetals of 2,3-dibromopropanol such as tris-(2,3-dibromopropyl) phosphate are also suitable. 1,2,5,6,9,10-Hexabromocyclododecane 1,2,5,6 - tetrabromocyclooctane and 1-chloro-2,3,4,5,6-pentabromocyclohexane are also used. Substances, such as ferrocene, which improve the flame-proofing effect, may also be added. The compositions are advantageously prepared by polymerizing the mixture of monomers in aqueous suspension in the presence of the expanding agent and the organic halogen compound. The product of this reaction can be expanded by heating with steam or hot air.

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