Patent ID: 6323260
Filing Date: 2001-11-27
Classification: C01P,C08J,C08K,C09C

Abstract:
A process for treating particles to render them hydrophobic, the process comprising the step of:contacting the particles with a compound of Formula I: ##STR30##or an acid addition or quaternary ammonium salt thereof, in which:at least one of R.sup.1, R.sup.2 and R.sup.3 are hydroxyl or hydrolysable groups;R.sup.4 is a divalent group that is resistant to hydrolysis at the Si--R.sup.4 bond;R.sup.5 is selected from: hydrogen; a C.sub.1-40 alkyl; a C.sub.2-40 mono-, di or tri-unsaturated alkenyl group; a C.sub.6 -C.sub.40 aryl group; a group of the formula: ##STR31##in which x is an integer from 2 to 10, R.sup.8 and R.sup.9, which may be the same or different, are each selected from: hydrogen; C.sub.1-18 alkyl; C.sub.2-18 mono-, di- or tri-unsaturated alkenyl; phenyl; a group of formula: ##STR32##wherein b is an integer from 1 to 10; a group of formula: ##STR33##wherein c is an integer from 1 to 10, and R.sup.10 and R.sup.11 may be the same or different and are each selected from: hydrogen, C.sub.1-10 alkyl group or C.sub.2-10 alkenyl group, provided that there is no double bond in the position alpha to the nitrogen atom; and a group of formula: ##STR34##wherein r is an integer from 1 to 6 and d is an integer from 1 to 4;R.sup.6 may be any of the groups defined for R.sup.5 with the provisos that: (i) R.sup.5 and R.sup.6 do not have a tertiary carbon atom adjacent to the nitrogen atom, and (ii) at least one of R.sup.5 and R.sup.6 has a carbon chain at least 12 carbon atoms in length uninterrupted by any heteroatoms;or R.sup.5 and R.sup.6 may together form a divalent group of formula: ##STR35##in which A is selected from: a --CHR group or a --NR group in which R is hydrogen or a C.sub.6-40 alkyl or C.sub.6-40 alkenyl group, a C.sub.6 -C.sub.40 aryl group, an oxygen atom and a sulfur atom, and t and v are each independently 1, 2, 3 or 4; provided that the sum of t and v does not exceed 6.