CELLULOSE ETHERS IN EMULSION POLYMERIZATION DISPERSIONS

A process is provided for preparing an acrylic copolymer latex having improved mechanical and shear stability comprising emulsion polymerizing at least one ethylenically unsaturated monomer having up to 23 carbons in the presence of, by weight based on the total monomer content, a) from about 0.05 %...

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Bibliographische Detailangaben
Hauptverfasser:	JANSSEN, BERNARDUS, J., W, KRUYTHOFF, DIRK, KROON, GIJSBERT, SALOMONS, WILLEMINA, G
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS CORRECTING FLUIDS DYES FILLING PASTES FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR IMPREGNATING OR COATING OF PAPER INKS LAUNDERING MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PASTES OR SOLIDS FOR COLOURING OR PRINTING POLISHES PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PULP COMPOSITIONS TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G TREATMENT OF TEXTILES OR THE LIKE TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS,FABRICS, FEATHERS, OR FIBROUS GOODS MADE FROM SUCH MATERIALS USE OF MATERIALS AS ADHESIVES USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	A process is provided for preparing an acrylic copolymer latex having improved mechanical and shear stability comprising emulsion polymerizing at least one ethylenically unsaturated monomer having up to 23 carbons in the presence of, by weight based on the total monomer content, a) from about 0.05 % to about 5.0 % of a protective colloid with a molecular weight of less than 75,000, and b) from about 0.01 % to about 1.5 % of a least one water soluble free radical polymerization initiator. This latex provides coating manufacturers the flexibility of either eliminating surfactants altogether from coating or to use small amounts thereof. L'invention concerne un procédé pour préparer un latex d'un copolymère acrylique ayant des propriétés mécaniques améliorées et une résistance améliorée au cisaillement. On procède à la polymérisation en émulsion d'au moins un monomère à insaturation éthylénique ayant jusqu'à 23 atomes de carbone en présence des constituants suivants, exprimés en pourcentage en poids par rapport à la teneur totale en monomère(s), a) environ 0,05 % à environ 5,0 % d'un colloïde protecteur avec un poids moléculaire inférieur à 75000, et b) environ 0,01 % à environ 1,5 % d'au moins un initiateur de polymérisation radicalaire hydrosoluble. Ce latex donne la possibilité aux fabricants de préparations de revêtement soit de se passer complètement des tensioactifs, soit de les utiliser en petites quantités.