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    Process for producing hollow emulsion polymer particles
    1.
    发明专利
    Process for producing hollow emulsion polymer particles 未知

    公开(公告)号：NZ565343A

    公开(公告)日：2010-10-29

    申请号：NZ56534306

    申请日：2006-07-10

    Applicant: BASF AG

    Inventor： ROSCHMANN KONRAD ,  TUCHBREITER ARNO ,  JAHNS EKKEHARD ,  LEUNINGER JORG ,  SCHULER BERNHARD ,  WAGNER OLIVER ,  REINSCH MICHAELA ,  WRAZIDLO ROBERT

    IPC: C08F285/00 ,  C08F2/22 ,  C08F265/04

    Abstract: The disclosure relates to a method for producing emulsion polymer particles with a core-shell structure, and to the use thereof in paints, paper coatings, foams and cosmetic agents. Particularly disclosed is a process for preparing emulsion polymer particles by preparing an aqueous emulsion comprising a multistage emulsion polymer created by sequentially polymerising (i) a seed; (ii) a swell seed comprising 0 to 100% by weight of at least one nonionically ethylenically unsaturated monomer and 0 to 40% by weight of at least one monoethylenically unsaturated hydrophilic monomer, based in each case on the total weight of the core stage polymer comprising the seed (i) and the swell seed (ii); (iii) a first shell comprising 85% to 99.9% by weight of at least one nonionically ethylenically unsaturated monomer and 0.1% to 15% by weight of at least one hydrophilic monoethylenically unsaturated monomer; (iv) a second shell comprising 85% to 99.9% by weight of at least one nonionically ethylenically unsaturated monomer and 0.1% to 15% by weight of at least one hydrophilic monoethylenically unsaturated monomer; (v) at least one plasticizer monomer having a ceiling temperature of less than 181 Deg C, preferably less than 95 Deg C; (vi) neutralizing to a pH of at least 7.5, the resultant particles with a base a third shell comprising 90% to 99.9% by weight of at least one nonionically ethylenically unsaturated monomer and 0.1% to 10% by weight of at least one hydrophilic monoethylenically unsaturated monomer; and, (vii) if appropriate, further shells comprising at least one nonionically ethylenically unsaturated monomer and at least one hydrophilic monoethylenically unsaturated monomer. The term "seed" relates to an aqueous polymer dispersion which is used at the beginning of the multistage polymerization and is the product of an emulsion polymerization, or may relate to an aqueous polymer dispersion present at the end of one of the polymerization stages for preparing the hollow particle dispersion, with the exception of the last stage. The seed which is used at the beginning of the polymerization of the first stage can also be prepared in situ and is composed preferably of acrylic acid, methacrylic acid, esters of acrylic acid and methacrylic acid, or mixtures thereof. Particularly preferred mixtures are those of n-butyl acrylate, methyl methacrylate, and methacrylic acid.

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