Precrosslinked silicone elastomer particles with an...

C - Chemistry – Metallurgy – 09 – D

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C09D 151/08 (2006.01) C08F 283/12 (2006.01) C09D 5/03 (2006.01)

Patent

CA 2232067

The invention relates to the use of precross-linked silicone elastomer particles with an organopolymer shell as the formulation constituent in powder coating material compositions based on thermoplastic or thermosetting binding agents said silicone elastomer particles contain (a) 5 to 95 % by weight, in relation the total weight of the copolymerisate, of a nucleus polymer of the general formula (R2SiO2/2)x.(RSiO3/2)y.(SiO4/2)z with x = 5 to 99.5 mol %, y = 0.5 to 95 mol %, z = 0 to 30 mol %, and (b) 5 to 95 % by weight, in relation to the total weight of the copolymer, a shell made of organopolymer of ethylenically mono or multi-unsaturated monomers, R standing for identical or different monovalent C1-C6 alkyl or alkenyl residues, aryl residues or substituted hydrocarbon residues.

L'invention concerne l'utilisation de particules en élastomère de silicone préréticulées, pourvues d'une enveloppe de polymère organique, utilisées comme composants dans des compositions de peintures en poudre à base d'agents de liaison thermoplastique ou thermodurcissables. Lesdites particules en élastomère de silicone contiennent (a) 5 à 95 % en poids, par rapport au poids total du copolymérisat, d'un polymère noyau de la formule générale (R¿2?SiO¿2/2?)¿x?.(RSiO¿3/2?)¿y?.(SiO¿4/2?)¿z?, où x = 5 à 99,5 % en mol, y = 0,5 à 95 % en mol, z = 0 à 30 % en mol, et (b) 5 à 95 % en poids, par rapport au poids total du copolymérisat, d'une enveloppe constituée d'un polymère organique de monomères éthyléniquement mono-insaturés ou multi-insaturés, R représentant des restes alkyle ou alcényle monovalents, identiques ou différents, possédant 1 à 6 atomes de carbone, des restes aryle ou des restes hydrocarbures substitués.

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