Precipitated silica for thickening and creating thixotropic...

Details Precipitated silica for thickening and creating thixotropic... Precipitated silica for thickening and creating thixotropic...

2011-07-26

2011-07-26

Green, Anthony J (Department: 1731)

Compositions: coating or plastic

Coating or plastic compositions

Silicon dioxide containing

C427S397700, C524S493000, C241S005000, C241S023000, C428S331000, C428S446000

Reexamination Certificate

active

07985292

ABSTRACT:
A precipitated silica having a d50-value of from 150 to 2000 nm, a d90-value of from 500 to 7000 nm, a silanol group density of from 2.5 to 8 OH
m2, and a modified tapped density of less than or equal to 70 g/l is useful for thickening and providing thixotropy in liquid systems and shows superior efficiency at thickening and creating thixotropy compared to existing grades of precipitated silica. The precipitated silica functions best as a thixotrope in non-polar or intermediate polar liquid systems such as unsaturated polyester (UPE) resin systems.

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