Silyl ester initiators for cyclosiloxane ring opening polymeriza

Details Silyl ester initiators for cyclosiloxane ring opening polymeriza Silyl ester initiators for cyclosiloxane ring opening polymeriza

1997-01-21

1997-12-09

Glass, Margaret W.

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

Synthetic resins

From silicon reactant having at least one...

528 23, 528 42, C08G 7708

Patent

active

056962193

ABSTRACT:
Method of making polysiloxanes by ring opening polymerization of 1,3,5-trimethyl-1,3,5-tris(3',3',3'-trifluoropropyl) cyclotrisiloxane (F.sub.3) or 1,3,5,7-tetramethyl-1,3,5,7-tetrakis(3',3',3'-trifluoropropyl) cyclotetras iloxane (F.sub.4) in an acid-free system using electrophillic initiators. The reaction mixture is formed under anhydrous conditions and contains (i) either F.sub.3 or F.sub.4, (ii) a Lewis base such as 2,6-di-tert-butylpyridine which serves as an acid scavenger, and optionally (iii) a salt of a strong acid such as tetrabutylammonium trifluoromethane sulfonate. The anhydrous mixture is contacted with a silyl ester of a strong acid such as triflic acid. The anhydrous reaction mixture is agitated at room temperature until a polysiloxane is formed.

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Journal of Polymer Science: Part A: Polymer Chemistry, vol. 33, 285-298, (1995).
Macromol. Chem. Phys., 196, 2715-2735, (1995).

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