Method for preparation of organohydrogen polysiloxanes

Details Method for preparation of organohydrogen polysiloxanes Method for preparation of organohydrogen polysiloxanes

1998-12-21

2000-03-28

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

C07F 708

Patent

active

060433884

ABSTRACT:
A method comprising the solventless reaction of a 1,1,3,3-tetraalkyldisiloxane (HR.sub.2 Si--O--Si R.sub.2 H) with a hexaalkycyclotrisiloxane (R'.sub.2 SiO).sub.3 in the presence of linear phosphonitrilic chloride to produce

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patent: 5866707 (1999-02-01), Herzig
Yoshino, K. Kawamata, A., JP 02306980A2 to Kao Corp, Dec. 20, 1990--reaction of cyclic trimer with water chlorodimethylsilane, SliO.sub.2 and hexane.
Andrianov, K.A., et al. J. Gen. Chem. USSR (Engl. Transl.), 1971, 41;603-605, reaction of the dipotassium salt of hexamethyltrisiloxane diol and chlorodimethylsilane.
Zhandov, A.A., et al. .J. Gen. Chem. USSR (Engl. Transl.) 1973, 43, 1265-1269, the ring opening reaction of octamethylcyclotetrasiloxane and tetramethyldisiloxane with sulfuric acid with an ion exchange resin (Schindler, S.; Ruehlmann, K., Plaste Kautsch.) 1978,25,384-3850).
Gustavson, W.A.; Epstein; P.S.; Curtis, M.D., J.Organometal. Chem., 1982, 238,87-97, the redistribution reaction of tetramethyldisiloxane with cyclometallodisiloxane complexes.
Sakiyama, M.; Okawara, R., J. Organometal, Chem., 1964, 2, 473-477.

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