Silanised, structurally modified, pyrogenically produced silica

C - Chemistry – Metallurgy – 09 – C

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C09C 1/30 (2006.01) C09D 7/12 (2006.01)

Patent

CA 2496922

Silanised, structurally modified, pyrogenically produced silicas, characterised by groups fixed to the surface, wherein the groups are dimethylsilyl and/or monomethylsilyl, are produced in that pyrogenically produced silica is treated by a known method with dimethyldichlorosilane and/or monomethyltrichlorosilane, the groups dimethylsilyl and/or monomethylsilyl being fixed on the surface of the pyrogenic silica, and is then structurally modified and optionally post-ground. They are used to improve scratch resistance in lacquers.

La présente invention concerne des silices silanisées, structurellement modifiées et produites par pyrogénation. Ces silices se caractérisent en ce qu'elles comprennent des groupes fixés à la surface, lesquels sont des groupes diméthylsilyl et/ou monométhylsilyl. La silice, produite par pyrogénation, est traitée au moyen d'un procédé connu avec un diméthyldichlorosilane et/ou un monométhyltrichlorosilane, les groupes diméthylsilyl et/ou monométhylsilyl étant fixés sur la surface de la silice pyrogène, puis elle est structurellement modifiée et éventuellement broyée. Les silices de la présente invention servent à améliorer la résistance à la rayure de laques.

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