Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1993-09-20
1994-10-18
Marquis,, Melvyn
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 15, 528 23, 528 37, C08G 7708
Patent
active
053570162
ABSTRACT:
The instant invention pertains to a method for producing polydiorganosiloxanes wherein the method comprises contacting (A) at least one organosilicon compound having in the molecule at least one silanol group and/or (C) triorganosilyl endblocker and (D) a diorganocyclicsiloxane with (B) a cation exchanged acid treated montmorillonite clay. The polydiorganosiloxanes produced by the method of this invention have less branching along the siloxane chain than those polydiorganosiloxanes produced by other methods.
REFERENCES:
patent: 4005023 (1977-01-01), Brown, Jr. et al.
patent: 4599437 (1986-07-01), Riederer
patent: 4888405 (1989-12-01), Gamon et al.
The Chemical Society of Japan, 1986: "Solid Acid-Catalyzed Allylation of Acetals and Carbonyl Compounds with Allylic Silanes" pp. 381-384, by Kawai, Onaka, and Izumi.
Applied Clay Science, 1987; "Synthetic Organic Chemistry Using Pillared, Cation-Exchanged and Acid-Treated Montmorillonite Catalysts-A Review"; pp. 309-342. by J. M. Adams.
Dow Corning Corporation
Marquis Melvyn
Severance Sharon K.
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