Surface treated silicas
AssigneeJ.M. Huber Corporation
InventorsAleksey Isarov, Thomas J. Lynch
Life of this patent
Estimating the term…
Abstract
Disclosed is a silica substrate treated with a polysiloxane, and an organosilane, wherein the organosilane is described by the formula: RSi(R′)x(OR″)3-x; wherein R is a long-chain hydrocarbon group having between about 8 to about 30 carbon atoms, which may also contain organofunctional groups such as vinyl, methacryl, amino, sulfur, and epoxy groups; R′ and R″ are independently selected from a methyl and ethyl group; and X is either 0 or 1. The optimal use for the treated silica substrate is as a rheology modifier in epoxy polymer materials, however, the silica substrate could also be used in other chemical compositions such as polyurethanes, polyesters, silicones, and hydrocarbon oils.
Claims7
A method of preparing a treated silica substrate comprising the sequential steps of:
- a) providing silica particles;
- b) contacting the silica particles with at least one polysiloxane conforming to formula (I)
- wherein n is an integer greater than 1, preferably between about 30 to about 100;
- X is selected from a hydrogen atom or an R′ group, preferably methyl;
- R, R′ are independently selected organic groups, with from about 1 to about 20 carbon atoms;
- and
- Y and Z are silicon-containing terminating end groups, preferably Y is —OSi(CH3)3 and Z is —Si(CH3)3;
- and
- c) contacting the silica particles with an organosilane described by the formula:
- RSi(R′)x(OR″)3-x (II)
- wherein R is a lone-chain hydrocarbon group having between about 8 to about 30 carbon atoms, and optionally contains organofunctional groups selected from the group consisting of vinyl, methacryl, amino, sulfur, and epoxy groups;
- R′ and R″ are independently selected from the group consisting of a methyl and an ethyl;
- and X is either 0 or 1.
Dependencies are inferred from the claim text.