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    13.
    发明专利
    未知

    公开(公告)号：FI66764B

    公开(公告)日：1984-08-31

    申请号：FI803190

    申请日：1980-10-08

    Applicant: BASF AG

    Inventor： SLIWKA WOLFGANG

    IPC: B01J13/02 ,  B01J13/18 ,  B41M5/165 ,  B41M5/00

    Abstract: In a process for the preparation of microcapsules based on a melamine-formaldehyde resin, in which the microcapsules are obtained by condensing a melamine-formaldehyde precondensate, its C1-C4-alkyl ethers, or mixtures thereof, in water in which the material forming the capsule core is dispersed, at a pH of from 3 to 6.5 and at from 20 DEG to 100 DEG C., the improvement that the water contains a homopolymer or copolymer which possesses sulfonic acid groups but is devoid of phenyl or sulfophenyl groups and has a K value of from 100 to 170 or a viscosity of from 200 to 5,000 mPa.s (shearing gradient 489 s-1; 20% strength solution at 25 DEG C.), and that the melamine-formaldehyde precondensate is added continuously, or in portions, in step with the rate of condensation. The process gives individual capsules which are highly impermeable. The capsules are exceptionally useful for the production of pressure-sensitive recording materials.

    15.
    发明专利
    未知

    公开(公告)号：DE2217696A1

    公开(公告)日：1973-10-18

    申请号：DE2217696

    申请日：1972-04-13

    Applicant: BASF AG

    Inventor： SLIWKA WOLFGANG ,  BACHMANN RUDOLF ,  BAUM GUENTHER ,  LUDSTTECK DIETER

    IPC: C09J7/02 ,  B01J13/02 ,  B01J13/20 ,  B41M5/165 ,  C09K23/52 ,  C11B9/00 ,  B01F17/34

    Abstract: 1418151 Colloidal dispersions BADISCHE ANILIN- & SODA-FABRIK AG 12 April 1973 [13 April 1972] 17556/73 Heading B1V Stable aqueous dispersions of microcapsules contain dissolved in the aqueous phase 0.01 to 3% by weight based on the weight of the dispersion of a partly cross-linked polymer containing carboxyl groups which are at least partly neutralised. The partially cross-linked polymer may be an alpha-beta unsaturated homopolymer or copolymer of a mono- or dicarboxylic acid cross-linked by irradiation or by incorporation of 0.01 to 5% by weight of a polyfunctional monomer, and may contain from 0 to 90% by weight of other copolymerizable olefinically unsaturated compounds. The polymer is preferably added in unneutralized form and neutralized in the dispersion. The dispersion may contain from 19 to 50% by weight of microcapsules of particle sizes from 2 to 5 microns. The microcapsules may comprise encapsulated reactive dye in organic liquid.

    Production of Polymer Dispersions.
    16.
    发明专利
    Production of Polymer Dispersions. 未知

    公开(公告)号：GB1155275A

    公开(公告)日：1969-06-18

    申请号：GB4841966

    申请日：1966-10-28

    Applicant: BASF AG

    Inventor： POHLEMANN HEINZ ,  FLORUS GERHARD ,  SLIWKA WOLFGANG ,  GELLRICH MANFRED

    IPC: C08F2/18 ,  C08F2/20 ,  C08F2/22 ,  C08F212/08 ,  C08F220/12

    Abstract: 1,155,275. Styrene/acrylate and/or methacrylate copolymers. BADISCHE ANILIN- & SODA FABRIK A.G. 28 Oct., 1966 [29 Oct., 1965], No. 48419/66. Heading C3P. Polymer dispersions are produced by copolymerizing styrene with 5-95% of esters of acrylic and/or methacrylic acid with C 1-8 alcohols in an aqueous medium in the presence of catalysts and emulsifiers, 0À01-2% of a protective colloid being gradually added after 20-80/) of the monomers have been copolymerized, and then completing the copolymerization. The esters may be ethyl, n- or tert-butyl, 2-ethylhexyl or cyclohexyl acrylate and/or methyl or butyl methacrylate. The copolymer may also include acrylic acid, acrylamide, methacrylamide, methyl vinyl carbinol, or vinyl sulphonic acid. Polyvinyl methyl ether may be present during the polymerization. The protective colloid may be a polyvinyl alcohol, which may be acetalized with n-butyraldehyde and completely hydrolysed, a hydroxyethyl cellulose, an ammoniacal solution of polyacrylic acid or a copolymer of acrylic acid/acrylamide/ acrylonitrile/methyl acrylate. The emulsifier may be the sodium salt of the sulphonated nonyl-phenol/ethylene oxide, ethylene oxide/noctylphenol, sodium vinyl sulphonate or propylene oxide/ethylene oxide. The catalyst may be potassium persulphate.

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