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    64.
    发明专利
    未知

    公开(公告)号：DE19754039A1

    公开(公告)日：1999-06-24

    申请号：DE19754039

    申请日：1997-12-05

    Applicant: BASF AG

    Inventor： DECKERS ANDREAS DR ,  WENDEROTH BERND DR ,  WEDEL PETER ,  WEBER WILHELM DR

    IPC: C10L1/18 ,  C08F2/00 ,  C08F210/02 ,  C08F218/08 ,  C10L1/197 ,  C10L1/00

    Abstract: The invention relates to a method for producing ethylene/vinyl acetate copolymers in which a mixture comprised of ethylene and vinyl acetate is continuously polymerized in the presence of radical polymerization initiators and optional molecular weight modifiers in a cooled tubular reactor at a pressure ranging from 1000 to 3500 bar. The polymerization initiator is charged at the beginning and at a number of positions along the tubular reactor, and the temperature changes in the reaction mixture range no more than 20 C between the first maximum temperature and the last charging of the polymerization initiator along the tubular reactor.

    65.
    发明专利
    未知

    公开(公告)号：ES2128639T3

    公开(公告)日：1999-05-16

    申请号：ES95118128

    申请日：1995-11-17

    Applicant: BASF AG

    Inventor： DECKERS ANDREAS DR ,  LITTMANN DIETER DR ,  KLIMESCH ROGER DR

    IPC: C08F210/02

    Abstract: In the prepn. of copolymers (I) of 94-99.5 mole-% C2H4 and 0.5-6 mole-% 3-6C alkenoic acid (II) by free radical high pressure polymerisation in a tubular reactor, the monomer mixt. is heated to a temp. not above 100 degrees C before adding the initiator and the max. polymerisation temp. does not exceed 260 degrees C. Also claimed are (I) per se; and adhesion promoters, fibres, films and mouldings contg. (I).

    69.
    发明专利
    未知

    公开(公告)号：DE59500626D1

    公开(公告)日：1997-10-16

    申请号：DE59500626

    申请日：1995-05-05

    Applicant: BASF AG

    Inventor： HENN ROLF DR ,  HAHN KLAUS DR ,  DECKERS ANDREAS DR ,  MCKEE GRAHAM EDMUND DR ,  TATZEL HERMANN ,  DRUMM RUDOLF DR ,  FISCHER JUERGEN DR

    IPC: C08J9/18 ,  C08J9/16 ,  C08J9/232 ,  C08L25/02 ,  C08L25/04 ,  C08L51/00 ,  C08L51/04 ,  C08L51/06

    Abstract: Expandable styrene polymers (I) for elastic polystyrene (PS) foam contain: (a) 75-99 wt.% PS and/or styrene copolymer contg. at least 50 wt.% styrene; (b) 0-24 wt.% styrene-soluble elastomer(s); (c) 1-25 wt.% core-shell type graft copolymer(s); (d) 1-15 wt.% (w.r.t. a+b+c) low-boiling blowing agent(s), and opt. (e) conventional additives. Also claimed are processes for the prodn. of (I) (see below). Also claimed is elastic PS foam contg. (a), (b), (c) and (e) in amts. as above. Also claimed is a process for the prodn. of PS foam by heating (I) at a temp. above the softening pt. so as to expand the particles and weld them together in a non-gastight mould. Pref. component (b) is polybutadiene, polyisobutylene or ethylene-propylene rubber, pref. polybutadiene. (c) is a core-shell graft copolymer, pref. with a core of a polymer with a Tg of 20 to -60 degrees C and a shell of harder material, in amts. of 40-80 wt.% and 20-60 wt.% respectively. Pref., the core consists of a copolymer of 40-90 wt.% alkyl (meth)acrylate and 10-60 wt.% styrene, and the shell of a copolymer of 80-99 wt.% styrene and 1-20 wt.% alkyl (meth)acrylate.

    70.
    发明专利
    未知

    公开(公告)号：ES2100600T3

    公开(公告)日：1997-06-16

    申请号：ES94109817

    申请日：1994-06-24

    Applicant: BASF AG

    Inventor： DECKERS ANDREAS DR ,  BESECKE SIEGMUND DR ,  ENDLICH KARL-LUDWIG

    IPC: C08F2/20 ,  C08F2/42 ,  C08F4/32 ,  C08F4/36 ,  C08F220/12

    Abstract: Bead polymers comprising 80 to 99 % by weight of at least one C1-C18-alkyl ester of methacrylic acid and 1 to 20 % by weight of at least one C1-C18-alkyl ester of acrylic acid, obtainable by polymerisation, at a temperature between 100 and 140 DEG C which is approximately constant over the majority of the polymerisation time, by means of an initiator system comprising at least two peroxidic initiators I having different decomposition temperatures T, at which in each case half of the initiator has decomposed after 1 hour, wherein - the initiator Imin having the lowest decomposition temperature has a decomposition temperature Tmin in the range from 60 to 100 DEG C, - the initiator Imax having the highest decomposition temperature has a decomposition temperature Tmax in the range from 100 to 140 DEG C, the difference between Tmax and Tmin is greater than 10 DEG C, and Imax is a perketal of the formula (I) in which the radicals R and R are identical or different alkyl radicals having 1 to 5 carbon atoms, where R and R can be connected to form a 5- or 6-membered ring, and R is a tert-butyl or tert-amyl radical, and - further initiators In, which can be used if desired and have decomposition temperatures Tn between Tmin and Tmax, in the presence of a protective colloid, with the proviso that from 20 to 80 % by weight of the C1-C18-alkyl ester of acrylic acid is only added after a conversion in the range from 20 to 80 %, based on the amount of monomer employed at the beginning.

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