The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 15, 1991
Filed:
Aug. 30, 1989
Warde T Collins, Midland, MI (US);
Kenneth R Cottrell, Midland, MI (US);
John C Saam, Midland, MI (US);
Dow Corning Corporation, Midland, MI (US);
Abstract
An improved method of producing treated silica filler for use with silicone rubber operates at ambient temperature in a short period of time. The method consists essentially of mixing reinforcing silica with a volatile treating agent of the formula R.sub.x Si(OR').sub.4 -.sub.x, wherein R is a substituted or unsubstituted, saturated or unsaturated, alkyl or aryl radical having from 1 to 6 carbon atoms, R' is an alkyl radical having from 1 to 3 carbon atoms, x is 1 or 2, and R and R' are chosed so that the vapor pressure of the alkoxysilane exceeds 10 Pa (0.0001) atmosphere) at treatment temperature, in combination with a volatile catalyst selected from the group consisting of acid A, base B, and mixtures thereof; wherein acid A is a volatile acid or acid progenitor, and base B is a silylamine or silazane, acid A and base B being chosen so that the vapor pressure of either acid A or base B exceeds 500 Pa (0.005 atmosphere) at treatment temperature, for a period of time sufficient to allow the desired amount of treating agent to be absorbed onto the surface of the particulate filler.