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    23.
    发明专利
    未知

    公开(公告)号：NO762332L

    公开(公告)日：1977-01-05

    申请号：NO762332

    申请日：1976-07-02

    Applicant: HOECHST AG

    Inventor： ZIMMERMANN W ,  SCHINDLER H

    IPC: C08F8/00 ,  C08F8/42 ,  C08F

    Abstract: 1533906 Polyvinyl alcohol/boric acid complexes HOECHST AG 2 July 1976 [4 July 1975] 27671/76 Heading C3P The water sensitivity of polyvinyl alcohol is reduced by heating a mixture containing polyvinyl alcohol and boric acid in aqueous solution, with a compound or buffer system which maintains the mixture, at a temperature of 18‹ to 28‹ C., at a pH not exceeding 7 and which, on heating only, is altered irreversibly in a manner such that the pH of the mixture is increased to the alkaline range. Suitable compounds are alkali metal, alkalene earth metal or ammonium salts of trichloro- or tribromo-acetic acid, or amine salts of these acids, e.g. sodium trichloroacetate. The buffer system may comprise an alkali metal salt of a volatile weak acid and the free acid.

    24.
    发明专利
    未知

    公开(公告)号：BR7302096D0

    公开(公告)日：1974-07-18

    申请号：BR209673

    申请日：1973-03-23

    Applicant: HOECHST AG

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

    IPC: C08L23/08 ,  C08F261/04 ,  C08J3/12 ,  C08L23/00 ,  C08L31/04 ,  C08F15/40 ,  C08F15/02 ,  C08F1/13

    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.

    DISPERSIBLE COPOLYMER POWER
    25.
    发明专利
    DISPERSIBLE COPOLYMER POWER 未知

    公开(公告)号：ZA732865B

    公开(公告)日：1974-04-24

    申请号：ZA732865

    申请日：1973-04-27

    Applicant: HOECHST AG

    Inventor： RAUTERKUS K ,  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 ,  C08F

    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.

    WATER-SOLUBLE LABEL
    27.
    发明专利
    WATER-SOLUBLE LABEL 未知

    公开(公告)号：NZ198547A

    公开(公告)日：1984-02-03

    申请号：NZ19854781

    申请日：1981-10-02

    Applicant: DUDZIK J ,  DUDZIK W ,  HOECHST AG

    Inventor： DUDZIK J ,  DUDZIK W ,  ZIMMERMANN W ,  POSPICH G

    IPC: C09J7/02 ,  C09J5/00 ,  G09F3/02 ,  G09F3/10

    Abstract: A label essentially comprises a top layer which can be printed and/or inscribed and a water-soluble adhesive layer. The adhesive layer can also be protected by a covering layer. The top layer is formed from polyvinyl alcohol which is preferably insoluble in cold water but soluble in hot water. The adhesive layer comprises a synthetic adhesive which is soluble in water and represents, in particular, a contact adhesive or permanent adhesive. The label is resistant to the action of cold water but is soluble in hot water, and is suitable for labeling containers with a smooth surface.

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