PROCESS FOR THE PREPARATION OF AQUEOUS DISPERSIONS OF LATEX PARTICLES HAVING A HETEROGENEOUS MORPHOLOGY, THE LATEX PARTICLES OBTAINABLE WITH THE PROCESS, THE DISPERSIONS AND REDISPERSIBLE POWDERS, AS WELL AS THE USE THEREOF

   
   

The invention relates to a process for the preparation of aqueous dispersions of latex particles having a heterogeneous morphology by a semicontinuous emulsion polymerization, comprising the emulsion polymerizing of ethylenically unsaturated (co)monomers, accompanied by, the addition of cationic and/or anionic and/or nonionic emulsifiers and/or protective colloids as stabilizers, which are directly used as such or synthesized in situ, the semicontinuous emulsion polymerization being performed in the presence of the stabilizer or stabilizers with a monomer mixture, which a) contains at least one nonionic, ethylenically unsaturated monomer with a glass transition temperature Tg above about 30.degree. C. in a quantity of about 10 to 70 wt. %, based on the total weight of ethylenically unsaturated (co)monomers and b) at least one hydrophilic, ethylenically unsaturated monomer in a quantity of about 5 to 30 wt. %, based on the total weight of ethylenically unsaturated (co)monomers.

A invenção relaciona-se a um processo para a preparação das dispersões aqueous das partículas do latex que têm uma morfologia heterogênea por uma polimerização semicontinuous do emulsion, compreendendo polimerizar do emulsion de ethylenically unsaturated (os co)monomers, acompanhados perto, a adição de emulsifiers cationic e/ou anionic e/ou nonionic e/ou de colóides protetores como os estabilizadores, que são usados diretamente como esta'n ou synthesized no situ, a polimerização semicontinuous do emulsion que estão sendo executados na presença do estabilizador ou estabilizadores com uma mistura do monomer, que a) contenha ao menos um nonionic, monomer ethylenically unsaturated com uma temperatura de transição de vidro Tg acima aproximadamente de 30.degree. C. em uma quantidade de aproximadamente 10 a 70 wt. %, baseada no peso total de ethylenically unsaturated (co)monomers e b) ao menos um hydrophilic, monomer ethylenically unsaturated em uma quantidade de aproximadamente 5 a 30 wt. %, baseada no peso total de ethylenically unsaturated (co)monomers.

 
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