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:
Nov. 02, 1976
Filed:
Dec. 28, 1973
Applicant:
Inventors:
Haruo Okamoto, Annnaka, JA;
Isao Yanagisawa, Annnaka, JA;
Assignee:
Shinetsu Chemical Company, Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07F / ;
U.S. Cl.
CPC ...
2604 / ;
Abstract
Cyclic polydiorganosiloxanes, in particular, cyclic trisiloxanes are continuously prepared from mixed polydiorganosiloxane, the starting material, by subjecting them to thermal cracking and rectification in a reactor composed of a column, vertically held, comprising a catalyst zone at the lower part in which the thermal cracking takes place to produce cyclic polydiorganosiloxanes and a rectification zone at the upper part in which the cyclic polydiorganosiloxanes are rectified into several fractions and a still positioned below the column. The cyclic polydiorganosiloxanes have structures different from the starting polydiorganosiloxanes.