| 摘要 |
Water redispersible powder of film-forming polymers that are water insoluble and prepared by polymerization in an aqueous emulsion of ethylenically unsaturated monomers with a core/shell structure including a hydrophobic core structure of a polymer having a Tg (glass transition temperature) of - 30 to + 25 DEG C, and preferably - 10 to + 20 DEG C and a hydrophilic shell of a polymer having a Tg above + 55 DEG C, and preferably above + 90 DEG C. The invention is characterized in that the shell is linked to the core by covalent bonds resulting from the reaction of a shell grafting agent on the ethylenic unsaturations remaining in the core, and is substantially insoluble in an alkaline medium.
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