CPC C08K 3/36 (2013.01) [C08K 5/548 (2013.01); C08L 21/00 (2013.01)] | 15 Claims |
1. A method for preparing a modified filler, the method comprising in sequence:
(a) providing an acidified aqueous slurry comprising:
(1) an untreated inorganic filler which has not been previously dried;
(2) an emulsifier material selected from the group consisting of fatty acids, salts of fatty acids, alkyl sarcosinates, salts of alkyl sarcosinates, and mixtures thereof; and
(3) a hydrophobating agent having the following structural formula (I):
Ra-M-X(4−a) (I)
wherein:
R is C6 to C22 alkyl,
M is silicon, titanium or zirconium,
X is OR′ or halogen,
R′ is C1 to C4 alkyl, and
a is 1;
(b) washing and/or filtering the acidified aqueous slurry of (a) to obtain a modified filler; and
(c) optionally, drying the modified filler.
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