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    3.
    发明专利
    未知

    公开(公告)号：DE1244334B

    公开(公告)日：1967-07-13

    申请号：DEB0070091

    申请日：1962-12-21

    Applicant: BASF AG

    Inventor： BRUENING DR DIETHELM ,  LINGE DR HERMANN

    IPC: C08J3/14 ,  D01D5/06 ,  D01D5/11 ,  D01D5/40 ,  D01F6/00 ,  D01F6/60

    Abstract: Fine fibres suitable for use in making papers, or cardboards are made by dissolving a polymer in an acid and reprecipitating it by diluting the acid solution with water with the use of a high shearing stress. In the example, polyhexamethylene adipamide is dissolved in sulphuric acid and the solution is dripped into water in a vessel provided with stirring means and baffles. After separation of the fibres, the diluted acid may be concentrated for reuse. Other acids referred to are hydrochloric, phosphoric and formic. Suitable polymers are polyhexamethylene - adipamide, polycaprolactam, polyacrylonitrile and polyethylene terephthalate. The fibres obtained may be processed alone or mixed with other natural or synthetic fibres on a paper-making machine to form non-woven fabrics, papers or cardboards. The fibres can be made to cohere by heating in the presence of water at temperatures below the softening points of the polymers.

    8.
    发明专利
    未知

    公开(公告)号：DE1209868B

    公开(公告)日：1966-01-27

    申请号：DEB0069380

    申请日：1962-10-25

    Applicant: BASF AG

    Inventor： POHLEMANN DR HEINZ ,  HASSE DR KARL ,  REINBOLD DR IMMO ,  BRUENING DR DIETHELM

    IPC: C08F2/18 ,  D21H19/58

    Abstract: Compositions for coating paper comprise an aqueous polymer dispersion, one or more pigments starch and/or casein, and optionally other additives, said dispersion containing: (i) a copolymer of 40 to 70 parts by weight of styrene, 3 to 60 parts by weight of at least one ester of acrylic acid with an alcohol having 2 to 12 carbon atoms and 0.5 to 5 parts by weight of methacrylamide; and (ii) an emulsifier mixture comprising (a) a sulphated reaction product of 1 mole of at least one (C6- 20-alkyl)-pheno with at least 9 moles of ethylene oxide and/or propylene oxide; and (b) at least one emulsifier which is a reaction product of 1 mole of a compound containing a hydroxyl, carboxyl or amide group with at least 10 moles of ethylene oxide. Suitable as emulsifiers (b) are ethoxylated fatty acids or amides or ethoxylated alcohols having at least 10 carbon atoms in the acid, amide or alcohol moiety, and also ethoxylated alkylphenols. As pigments there are specified kaolin, china clay, barium sulphate, calcium carbonate and titanium dioxide. Pigment dispersing agents may also be present e.g. polyacrylic acid salts, maleic acid copolymer salts (e.g. copolymers with styrene, vinyl ethers and isobutylene), salts of partly esterified maleic acid copolymers and high molecular weight polyphosphates including sodium hexameta phosphate. Other optional ingredients include optical brighteners, dyes antifroth agents, waxes and plasticizers (al unspecified). In examples, the copolymers used are copolymers of styrene and methacrylamide with ethyl, n-butyl, isobutyl, 2-ethylhexyl, dodecyl or isobutyl/2-ethyl hexyl acrylate. In one example, a sturene-isobutyl acrylate-methacrylamide copolymer dispersion is prepared by emulsion polymerization of the appropriate monomers using potassium persulphate catalyst, part of the monomer emulsion being added during polymerization.ALSO:Paper is coated with a composition which comprises an aqueous polymer dispersion, one or more pigments, starch and/or casein, and optionally other additives, said dispersion containing:- (i) a copolymer of 40 to 70 parts by weight of styrene, 30 to 60 parts by weight of at least one ester of acrylic acid with an alcohol having 2 to 12 carbon atoms and 0.5 to 5 parts by weight of methacrylamide and (ii) an emulsifier mixture comprising (a) a sulphated reaction product of 1 mole of at least one (C6 - 20 alkyl)-phenol with at least 9 moles of ethylene oxide and/or propylene oxide and (b) at least one emulsifier which is a reaction product of 1 mole of a compound containing a hydroxyl, carboxyl or amide group with at least 10 moles of ethylene oxide. Suitable as emulsifiers (b) are ethoxylated fatty acids or amides or ethoxylated alcohols having at least 10 carbon atoms in the acid, amide or alcohol moiety, and also ethoxylated alkylphenols. As pigments there are specified kaolin, china, clay, barium sulphate, calcium carbonate and titanium dioxide. Pigment dispersing agents may also be present e.g. polyacrylic acid salts, malcic acid copolmer salts, salts of partly esterified malcic acid copolymers and high molecular weight polyphosphates including sodium hexametaphosphate. Other optional ingredients include optical brighteners, dyes, antifroth agents, waxes and plasticisers (all unspecified). The compositions are suitable for coating paper with conventional applicator equipment, e.g. roll coaters and doctor blades.

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