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    2.
    发明专利
    未知

    公开(公告)号：DK134821C

    公开(公告)日：1977-06-20

    申请号：DK162273

    申请日：1973-03-23

    Applicant: HOECHST AG

    Inventor： MATSCHKE K ,  RAUTERKUS K J ,  SEIP D ,  ZIMMERMANN W

    IPC: C08L23/08 ,  C08F261/04 ,  C08J3/12 ,  C08L23/00 ,  C08L31/04

    Abstract: Vinyl acetate/ethylene copolymer powders are obtained by spray-drying of the corresponding aqueous polymer dispersions while simultaneously adding finely divided inorganic materials as anti-caking agents. The polymer powders thus obtained have an excellent storage stability, are easily dispersible in water and yield plastics mortars of high water resistance and plasterings made therefrom which are free from cracks.

    3.
    发明专利
    未知

    公开(公告)号：SE392473B

    公开(公告)日：1977-03-28

    申请号：SE7306298

    申请日：1973-05-04

    Applicant: HOECHST AG

    Inventor： RAUTERKUS K J ,  BLAZEK J ,  ZIMMERMANN W

    IPC: C08F6/00 ,  C08F6/06 ,  C08F20/00 ,  C08F20/52 ,  C08F218/00 ,  C08F218/02 ,  C08F218/04 ,  C08J3/02 ,  C08J3/12 ,  C08J3/16 ,  C08L31/00 ,  C08L31/02 ,  C09D133/02 ,  C09D133/04 ,  C09J131/04

    Abstract: 1408361 Vinyl ester copolymer powders HOECHST AG 4 May 1973 [5 May 1972] 21355/73 Heading C3P A water dispersible powdered copolymer is prepared by copolymerizing a vinyl ester and an acrylamide of the formula in which X is H or -CH 3 , Y is H or -CH 2 OZ, and Z is H, alkyl or acyl, each having up to 4 carbon atoms, in an emulsifier-free aqueous dispersion, and subsequently drying the dispersion to form a powder. Ethylene may be additionally copolymerized. Drying may be effected by freeze-drying, drum drying or fluidized bed spray granulation. The latter method may utilize air or nitrogen as the drying gas, which may be passed into the drying tower at a temperature of 90-110‹ C. A filler may be added before, during, or after drying. Specified monomers are: vinyl acetate, -laurate, -stearate, -butyrate and -propionate; and acrylamide, methacrylamide, N-methylol (meth) acrylamide, and (meth)acrylamide-N-methylolmethyl ether. In the example, vinyl acetate, acrylamide and ethylene are copolymerized in the absence of emulsifier, and spray dried.

    5.
    发明专利
    未知

    公开(公告)号：SE422806B

    公开(公告)日：1982-03-29

    申请号：SE7800120

    申请日：1978-01-04

    Applicant: HOECHST AG

    Inventor： ZIMMERMANN W ,  SCHINDLER H

    IPC: C02F9/00 ,  C08J11/06 ,  C08J11/04

    Abstract: In order to protect the environment from pollution, it is desirable to keep the polyvinyl alcohol content in waste waters as low as possible. Polyvinyl alcohol may be removed from waste waters by means of microorganisms on the the one hand, and on the other according to chemical/mechanical methods by salting-out and precipitation and subsequent separation of the solids. Advantageous is the precipitation in the form of a polyvinyl alcohol/boric acid/didiol complex, especially by means of alkaline earth metal hydroxides in an alkaline medium. Calcium hydroxide is a particularly suitable alkaline earth metal hydroxide.

    7.
    发明专利
    未知

    公开(公告)号：SE399073B

    公开(公告)日：1978-01-30

    申请号：SE7502462

    申请日：1975-03-05

    Applicant: HOECHST AG

    Inventor： SCHINDLER H ,  ZIMMERMANN W

    IPC: C08J9/28 ,  C08J9/00

    Abstract: Starch products which were hitherto used as pore-forming substances in the manufacture of polyvinyl alcohol acetal sponges are replaced by polyethylene glycol or polyacrylamide. This results in a more uniform distribution of pore size, lower shrinkage of the sponge material during the acetalization, and easier washing of the sponge after the acetalization.

    9.
    发明专利
    未知

    公开(公告)号：NO136673B

    公开(公告)日：1977-07-11

    申请号：NO120673

    申请日：1973-03-23

    Applicant: HOECHST AG

    Inventor： MATSCHKE K ,  RAUTERKUS K J ,  SEIP D ,  ZIMMERMANN W

    IPC: C08L23/08 ,  C08F261/04 ,  C08J3/12 ,  C08L23/00 ,  C08L31/04

    Abstract: Vinyl acetate/ethylene copolymer powders are obtained by spray-drying of the corresponding aqueous polymer dispersions while simultaneously adding finely divided inorganic materials as anti-caking agents. The polymer powders thus obtained have an excellent storage stability, are easily dispersible in water and yield plastics mortars of high water resistance and plasterings made therefrom which are free from cracks.

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