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US 6,146,762 AGranted
Modified porous silica, process for its manufacture and its use in paints and as a carrier pigments and dyes
AssigneeElf Atochem S.A.
InventorsBruno D'Herbecourt, Yves Lermat, Michael Werth, Olivier Julien
Life of this patent
Estimating the term…
Abstract
The invention relates to porous silicas in which the pores are at least partially filled with polyamide resins. They can be employed as additives to liquid paints, as carriers for pigments and/or dyes, as antiblocking agents for folded or wound films made of olefinic material and in cosmetic, pharmaceutical and/or dermatological compositions.
Claims9
Silica comprising a pore volume of between 0.4 and 2 ml/g, an absorptivity, measured according to DIN ISO standard 787/V of between 100 and 350 g of oil/100 g of silica, mean particle diameter of between 0.5 and 150 .mu.m;
- modified with polyamide resins whose monomers are solid at ambient temperature, and obtained by dry mixing of the polyamide monomers reduced to powder and of the silica at ambient temperature, followed by the polymerization of the said monomers whereby a porous silica is obtained in which the pores are at least partially filled with polyamide resins.
Dependencies are inferred from the claim text.