Process for producing a silicone polymer

Details Process for producing a silicone polymer Process for producing a silicone polymer

1999-08-26

2000-04-25

Foelak, Morton

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

Synthetic resins

From silicon reactant having at least one...

528 12, 528 33, 528 34, 528 37, C08G 7706, C08G 7708

Patent

active

060545488

ABSTRACT:
A process for producing a silicone polymer having a volatile material content of less than 1% by weight, preferably less than 0.1% by weight, comprises the sequential steps of (i) producing an unstripped silicone polymer by polymerisation of a linear silanol group containing siloxane by condensation polymerisation, or of a cyclosiloxane by ring-opening polymerisation, or of a mixture of said linear and cyclosiloxanes, with a phosphazene base in the presence of water and the presence or absence of a filler, (ii) neutralising the catalyst, and (iii) stripping the unstripped silicone polymer, preferably at temperatures of 200.degree. C. and above.

REFERENCES:
patent: 5384383 (1995-01-01), Legrow et al.
patent: 5426168 (1995-06-01), Witucki

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