C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
C08K 9/06 (2006.01) C08F 2/44 (2006.01) C08F 292/00 (2006.01) C08L 101/00 (2006.01)
Patent
CA 2506590
Fine core/shell type composite particles which comprise fine inorganic nanometer-size particles as cores and a fluoropolymer comprising units derived from a fluoromonomer as shells; a process for producing the particles; and a use of the particles. The particles comprise fine inorganic nanometer-size particles whose surface has been coated with a fluoropolymer comprising units derived from a fluoromonomer, wherein the proportion of the fine inorganic particles is 1 to 90 wt.% and the fluoropolymer comprises units derived from a fluoromonomer having a polymerizable unsaturated group in which a carbon atom has a fluorine atom bonded thereto. The process, which is for producing the fine composite particles, comprises polymerizing the fluoromonomer by seed polymerization in a polymerization system comprising an aqueous medium and fine inorganic nanometer-size particles dispersed therein in the presence of a surfactant. A powder comprising the fine composite particles is useful as a filler for incorporation into thermoplastic polymers or thermosetting resins, and a thermoplastic polymer or thermosetting resin containing the fine composite particles is used as a molding material. A powder of the fine composite particles in which the content of fine inorganic particles is low can be used by itself as a molding material.
L'invention porte sur des particules composites fines de type coeur/coquille comportant une particule fine minérale de la taille du nanomètre comme coeur, et un fluoropolymère comportant des unités dérivées d'un fluoromonomère comme coquille, et sur l'utilisation desdites particules composites. Le coeur minéral représente de 1 à 90 % du poids d'une particule composite. L'enrobage de fluropolymère formant la coquille dérive d'un fluoromonomère présentant un groupe polymérisable insaturé auquel est lié un atome de fluor. Le procédé de production des particules composites consiste à polymériser le fluoromonomère par polymérisation/granulation dans un système de polymérisation comportant un milieu aqueux où sont dispersées les particules minérales en présence d'un tensio-actif. On peut utiliser une poudre de ces particules composites comme charge pour polymères thermoplastiques ou résines thermodurcissables qui ainsi chargés peuvent servir de matériau de moulage. On peut également utiliser seule une poudre de particules composites à faible teneur en particules minérales comme matériau de moulage.
Asahi Glass Company Limited
Smart & Biggar
LandOfFree
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