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:
Aug. 10, 1976
Filed:
May. 05, 1975
John S Razzano, Watervliet, NY (US);
Verne G Simpson, Mechanicville, NY (US);
General Electric Company, Waterford, NY (US);
Abstract
Diorganopolysiloxane copolymers having a viscosity from 100,000 to 200,000,000 centipoise at 25.degree.C., are produced by (a) forming an admixture of (i) a cyclic alkyl trifluoropropyl trisiloxane, (ii) a second cyclic diorgano trisiloxane, (i) being present in an amount of 40 to 85 mol % of the total of (i) and (ii), (iii) from 5 to 300 parts per million of an alkyl lithium catalyst, the alkyl component containing from 1 to 12 carbon atoms, and (iv) an aprotic solvent, said aprotic solvent being capable of dissolving both the trimers (i) and (ii) and the copolymer product, (b) reacting said admixture at a temperature between 0.degree.C. and 150.degree.C. to form the copolymer, and (c) recovering the copolymer from the reaction mixture.