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    Production of flexible coatings
    12.
    发明专利
    Production of flexible coatings 未知

    公开(公告)号：GB1125718A

    公开(公告)日：1968-08-28

    申请号：GB280866

    申请日：1966-01-21

    Applicant: BASF AG

    Inventor： REINHARD HANS ,  HOELSCHER FRIEDRICH ,  DOTZAUER BERNHARD

    IPC: C09D127/08 ,  D21H19/20 ,  D21H19/82

    Abstract: 1,125,718. Coated sheet material. BADISCHE ANILIN-& SODA FABRIK, A.G. 21 Jan., 1966 [22 Jan., 1965], No. 2808/66. Heading B2E. [Also in Division C3] Sheet materials containing cellulose are coated with a sub-coat by applying aqueous dispersions of mixtures of (1) copolymers A of 80-98% by weight of vinylidene chloride and 2-20% by weight of copolymerisable monoethylenically unsaturated compounds and (2) polymers B of ethylenically unsaturated compounds having a glass transition temperature of +10‹ to -55‹C, the amount of polymers B being 10-65% of the weight of the sum of the polymers A and B in the mixture, drying the sub-coat and thereafter applying as top-coat aqueous dispersions of a copolymer of 80-98% by weight of vinylidene chloride and 2-20% by weight of a copolymerisable monoethylenically unsaturated compound and drying the top-coat. Compounds copolymerisable with the vinylidene chloride in copolymers A may be esters of acrylic and/or methacrylic acid and monohydric aliphatic alcohols containing 1-8 carbon atoms in the alcohol radical, and vinyl chloride, acrylonitrile, methacrylonitrile, styrene, vinyl esters of aliphatic monocarboxylic acids having 2-12 carbon atoms, such as vinyl acetate and propionate, acrylamide, methacrylamide, acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid, the monoamides and N-substituted monoamides of said acids, esters and monoesters of these acids, and aliphatic monohydric and aliphatic monohydric alcohols containing 1-8 carbon atoms, maleic anhydride and itaconic anhydride. Polymers B may be copolymers containing 40-90% by weight of esters of acrylic acid and/or methacrylic acid with monohydric alcohols containing 2-8 carbon atoms and 10-60% of other conventional monoethylenically unsaturated compounds polymerisable by free radical mechanisms, such as methyl methacrylate, methyl acrylate, styrene, acrylonitrile, vinyl chloride or vinylidene chloride Copolymers of n-butyl acrylate and of butadiene with styrene, acrylonitrile or esters of ethylenically unsaturated carboxylic acids may be used. The proportions of monomers must be such as to provide the specified glass transition temperature. Various suitable copolymers are identified in the Examples. Emulsifiers may be added to the dispersions such as surface active salts of sulphonated ethenoxylated alkylphenols or fatty alcohols. Heat and light stabilizers, anti-foams,. thickeners and plasticizers may be added. Coating may be by means of doctor knives, rollers or shreading means, flooding means, houring or dipping. Drying may be with infrared rays or preheated air. The substrate may be paper or laminates of paper with metal foils such as aluminium foils.

    Improvements in the production of film-forming aqueous polymer dispersions
    14.
    发明专利
    Improvements in the production of film-forming aqueous polymer dispersions 未知

    公开(公告)号：GB919685A

    公开(公告)日：1963-02-27

    申请号：GB3067561

    申请日：1961-08-25

    Applicant: BASF AG

    Inventor： DAUMILLER GUENTHER ,  HOELSCHER FRIEDRICH ,  SCHMOETZER GUENTER

    IPC: C08F261/06 ,  C09D4/06

    Abstract: Film-forming aqueous polymer dispersions are prepared by polymerizing an ethylenically unsaturated compound in aqueous emulsion in the presence of an emulsifier and of 0,1 to 10% by weight of the monomers of one or more polyvinyl alkyl ethers, which may contain hydrophilic substituents. Ether polymers specified are those of C1-C4 alkyl vinyl ethers, ethylene glycol monovinyl ether, monoethyl diethylene glycol vinyl ether, methyl vinyloxyacetate, vinyloxyethylamine and ureidoethylvinyl ether, and the products containing hydroxyl groups obtained by the partial ether-cleavage of polyvinyl alkyl ethers. Polymerizable monomers specified are styrene, vinyl and vinylidene chlorides, acrylic acid, methyl methacrylate, butyl acrylate, allyl acrylate, butanediol diacrylate, acrylamide, methacrylamide, acrylonitrile, vinyl acetate and propionate and butadiene. Emulsifiers specified are the sodium salts of alkyl benzene and paraffin sulphonates and addition products of ethylene oxide and fatty alcohols or octyl phenol. The reaction medium may also contain catalysts, e.g. persulphates, azodiisobutyronitrile and persulphates + sodium hydrogen sulphite, and dodecyl mercaptan. The examples describe the polymerization of: (1) styrene followed by the polymerization of butadiene in the polystyrene latex thus formed; (2) a mixture of acrylic acid, methyl methacrylate, butyl acrylate and acrylonitrile; (3) vinyl propionate; and (4) a mixture of methyl methacrylate and butyl acrylate.

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