Title:
α,ω-ジハイドロジェンオルガノペンタシロキサンの製造方法
Document Type and Number:
Japanese Patent JP4278725
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain the subject compound useful as a raw material for a silicone rubber, a surface treating agent, etc., industrially advantageously by reacting a specific cyclotrisiloxane with a disiloxane in the presence of an acid catalyst in a non-equilibrium manner for suppressing side reactions. SOLUTION: This α,ω-dihydrogenorganopentasiloxane expressed by formula III, widely used as a raw material for a silicone rubber, modified silicone rubber, surface treating agent, etc., and having >=3 times content of the α,ω- dihydrogenorganopentasiloxane as compared with that of α,ω- dihydrogenorganooctasiloxane as a byproduct and expressed by formula IV, is obtained in a high selectivity and a high yield by reacting a cyclotrisiloxane expressed by formula I (R is a monovalent hydrocarbon group, a halogenated hydrocarbon group or H, provided that not all the R are simultaneously H) with a disiloxane expressed by formula II in the presence of an acid catalyst.
Inventors:
Nao Okawa
Application Number:
JP34429897A
Publication Date:
June 17, 2009
Filing Date:
November 28, 1997
Export Citation:
Assignee:
DOW CORNING CORPORATION
International Classes:
B01J31/02; C07B61/00; C07F7/08
Other References:
Catalytic polymerization of octamethylcyclotetrasiloxane in presence of 1,1,3,3-tetramethyldisiloxane,J. GENERAL CHEM. USSR,1973年,Vol.43,P.1265-1269