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:
Mar. 02, 1993
Filed:
Nov. 14, 1990
Sidney A Hansen, Beaverton, MI (US);
Charles E Neal, Jr, Midland, MI (US);
Dow Corning Corporation, Midland, MI (US);
Abstract
The described process uses aqueous hydrogen chloride as a catalyst to effect the condensation of chloride and hydroxy end-substituted polyorganosiloxanes, in the presence of triorganosilyl endblocker to control chain length. The inventors have discovered that within a range of about 10 to 30 percent aqueous solution of hydrogen chloride, it is possible to produce polyorganosiloxanes with low levels of chloride and hydroxy substitution. Furthermore, it has been found that within this hydrogen chloride range, temperature and hydrogen chloride concentration can be controlled to produce polyorganosiloxane polymers with a reproducible and predictable level of hydroxy substitution.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile