公开(公告)号：EP0830400B1

公开(公告)日：1999-08-11

申请号：EP96920872.7

申请日：1996-05-31

申请人： RHODIA CHIMIE

发明人： RICHARD, Joel ,  BETT, William

IPC分类号： C08F257/02 ,  C08F265/04

CPC分类号： C08F291/00 ,  Y10T428/2998 ,  C08F2/22

摘要： A water-redispersible powder based on substantially water-insoluble film-forming polymers prepared by the aqueous emulsion polymerisation of ethylenically unsaturated monomers with a core/shell structure comprising a hydrophobic polymeric core with a glass transition temperature (Tg) of -30-25 °C, preferably -10-20 °C; and a shell attached to the core by covalent bonds resulting from the reaction of a grafting agent for grafting the shell onto the remaining ethylenically unsaturated linkages in the core. Said shell is prepared by emulsion polymerisation on the core particles of a monomer mixture comprising at least one monomer selected from styrene or a C1-12 alkyl acrylate or methacrylate; at least one monomer having a saccharide grouping and at least one ethylenically unsaturated linkage; and at least one grafting agent.

公开(公告)号：EP0801659B1

公开(公告)日：1999-03-10

申请号：EP95943247.7

申请日：1995-12-20

申请人： RHODIA CHIMIE

发明人： BETT, Bill ,  RICHARD, Joel

IPC分类号： C08F279/02 ,  C09D151/04 ,  C09J151/04 ,  D21H19/58

CPC分类号： D21H19/58 ,  C08F279/02 ,  C09D151/04 ,  C09J151/04 ,  Y10S977/70

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.