Method for preparing polydiorganosiloxanes partially end-blocked

Details Method for preparing polydiorganosiloxanes partially end-blocked Method for preparing polydiorganosiloxanes partially end-blocked

1998-10-14

2000-03-14

Moore, Margaret G.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 35, 528 23, 528 15, 528 31, 528 32, C08G 7706

Patent

active

060374349

ABSTRACT:
This specification describes and claims a method for producing polydiorganosiloxanes partially end-blocked with substituted silethylene groups. The method comprises the steps of: A) mixing a hydroxyl end-blocked polydiorganosiloxane with a silicon-containing compound having at least two silicon-bonded hydrogen atoms and a --Si(R').sub.3 end-blocked siloxane in the presence of an acidic polymerisation catalyst to form a mixture wherein each R' independently denotes a monovalent hydrocarbon or halohydrocarbon having 1 to 6 carbon atoms, B) conducting a reaction with the mixture of step A so as to produce a polydiorganosiloxane having at least one silicon-bonded hydrogen atom and at least one --Si (R').sub.3 group and C) adding a substituted alkenylsilane in the presence of a hydrosilylation catalyst to the reaction product obtained from step B to form a polydiorganosiloxane partially end-blocked with substituted silethylene groups. A chain extender may also be included with the reaction mixture of step A and/or the reaction product of step B. The polydiorganosiloxanes are suitable for use in sealant compositions.

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patent: 5840794 (1998-11-01), Palmer

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