Aggregated-particle composition

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 51/00 (2006.01)

Patent

CA 2593051

A novel aggregated-particle composition which can be recovered so as to be extremely reduced in the content of fine particles and coarse particles and satisfactory in powder characteristics including blocking resistance and powder flowability, without deteriorating the original quality possessed by the polymer itself, such as the effect of improving impact resistance. The aggregated-particle composition comprises: a graft polymer (A) comprising one or more flexible polymer phases and one or more rigid polymer phases, the outermost part thereof being the rigid polymer phase; a water-soluble polymer (B) having the property of forming a physical gel; and a gellant (C) therefor. The composition is characterized in that the amount of the water-soluble polymer (B) having the property of forming a physical gel is 0.01-3.0 parts by weight per 100 parts by weight of the graft polymer (A) and the proportion of the outermost rigid polymer phase in the graft polymer (A) is 0.5-10 wt.%.

L~invention concerne une nouvelle composition de particules agglomérées qu~il est possible d~obtenir de manière à ce qu~elle ait une teneur extrêmement réduite en particules fines et particules grossières et qu~elle présente des caractéristiques de poudre satisfaisantes (notamment résistance au blocage et fluidité de la poudre), sans que s~en trouvent altérées les qualités du polymère initial, par exemple sa résistance améliorée à l~impact. La composition de particules agglomérées comprend : un polymère greffé (A) comprenant une ou plusieurs phases polymères souples et une ou plusieurs phases polymères rigides, ces dernières représentant la partie la plus extérieure dudit copolymère ; un polymère hydrosoluble (B) ayant la propriété de former un gel physique ; et un gélifiant (C) pour cela. La composition est caractérisée en ce que la quantité dudit polymère hydrosoluble (B) est de 0,01 à 3,0 parties en poids pour 100 parties en poids du polymère greffé (A), et que la proportion de la phase polymère rigide la plus extérieure dans ce même polymère greffé va de 0,5 à 10 % en poids.

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