US 11,708,475 B2
Method for preparing modified filler, compositions and articles containing same
Lucas Dos Santos Freire, Pittsburgh, PA (US); Sik Boen, Moseley, VA (US); and Nathan J. Silvernail, Mars, PA (US)
Assigned to PPG Industries Ohio, Inc., Cleveland, OH (US)
Filed by PPG Industries Ohio, Inc., Cleveland, OH (US)
Filed on Dec. 15, 2020, as Appl. No. 17/121,912.
Claims priority of provisional application 62/950,494, filed on Dec. 19, 2019.
Prior Publication US 2021/0189096 A1, Jun. 24, 2021
Int. Cl. C08K 3/36 (2006.01); C08K 5/548 (2006.01); C08L 21/00 (2006.01)
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.