Cellulose ethers in emulsion polymerization dispersions

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 2/22 (2006.01) C08F 2/24 (2006.01) C09D 5/02 (2006.01) C09D 11/10 (2006.01) C09D 157/00 (2006.01) D21H 19/50 (2006.01) D21H 19/52 (2006.01) D21H 19/54 (2006.01) D21H 19/58 (2006.01)

Patent

CA 2204242

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.

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