Method of making organisiloxane resins

Details Method of making organisiloxane resins Method of making organisiloxane resins

1990-02-22

1992-05-05

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 20, 528 34, 528 30, 528 39, 556450, C08G 7706

Patent

active

051108909

ABSTRACT:
Liquid organosiloxane MTQ resins of the general formula [M.sub.x T.sub.y Q.sub.z ].sub.n wherein M denotes a monofunctional, T a trifunctional and Q a tetrafunctional siloxane unit, n has an average value of from 4 to 14, x+y is not less than z and not more than 2 z and x/y has a value of from 2 to 9 are prepared by a method comprising (I) adding together (A) a silane of the general formula SiZ.sub.4, (B) a silane of the general formula RSiY.sub.3 and (C) a silane of the formula R.sub.3 SiX or (C') a disiloxane of the formula (R.sub.3 Si).sub.2 O in an acidic aqueous medium and (II) allowing Components (A), (B) and (C) or (C') to react together. X denotes a halogen or alkoxy group, Y denotes X or --OSiR'.sub.3, Z denotes an alkoxy group and Component (A) is not added to the aqueous medium prior to Components (B) and (C) or (C').

REFERENCES:
patent: 3036985 (1962-06-01), Daudt
patent: 3772247 (1973-03-01), Flannigan
patent: 4374933 (1983-02-01), Scholze et al.
patent: 4485130 (1984-11-01), Lampin et al.

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