Process for preparing low molecular weight organosiloxane termin

Details Process for preparing low molecular weight organosiloxane termin Process for preparing low molecular weight organosiloxane termin

1995-08-24

1996-11-19

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 23, 528 33, 556459, 556469, C08G 7708

Patent

active

055764088

ABSTRACT:
Hydrolysis of an alkoxysiloxane of the formula: R.sup.1.sub.a (R.sup.2 O).sub.b SiO.sub.(4-a-b)/2 wherein R.sup.1 is a monovalent hydrocarbon group, R.sup.2 is an alkyl group having 1 to 4 carbon atoms, letter a=0 to 2.2, b=0.2 to 3, 2.ltoreq.a+b.ltoreq.3, and the number of silicon atoms in a molecule is 2 to 5, is effected in the presence of a cation exchange resin by adding water therereto in an amount of 1 to 10 mol per mol of the alkoxy group in the alkoxysiloxane and agitating the mixture. Low molecular weight, linear organosiloxanes having a silanol terminal group including dimer diol and trimer diol are produced in high yields.

REFERENCES:
patent: 3304318 (1967-02-01), Brady
patent: 4066680 (1978-01-01), Lewis et al.
patent: 4929703 (1990-05-01), Narula et al.
patent: 4977290 (1990-12-01), Evans et al.
patent: 5378788 (1995-01-01), Omura et al.

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