Process for the preparation of organopolysiloxane resin

Details Process for the preparation of organopolysiloxane resin Process for the preparation of organopolysiloxane resin

2006-04-11

2006-04-11

Moore, Margaret G. (Department: 1712)

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

Synthetic resins

From silicon reactant having at least one...

C528S021000, C528S012000, C528S023000

Reexamination Certificate

active

07026427

ABSTRACT:
A process for the preparation of organopolysiloxane resins, wherein a silanein-line-formulae description="In-line Formulae" end="lead"?R3SiOR1  (I)in-line-formulae description="In-line Formulae" end="tail"?or a hydrolyzate thereof, and a silanein-line-formulae description="In-line Formulae" end="lead"?Si(OR2)4  (II)in-line-formulae description="In-line Formulae" end="tail"?or a partial hydrolyzate thereof,are reacted with acidified water and a portion of alcohol distilled off;the mixture is then reacted in the presence of base and a water-insoluble organic solvent and water, alcohol and optionally a portion of water-insoluble organic solvent are removed;the mixture is then neutralized with acid, and any water, alcohol, and a portion of organic solvent are distilled off;the mixture obtained is then treated with organopolysiloxanes and precipitated salts formed are then removed, and optionally,the mixture is separated from water-insoluble organic solvent.

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