Method for making siloxane resins

Details Method for making siloxane resins Method for making siloxane resins

1987-06-15

1988-09-27

Bleutge, John C.

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

Synthetic resins

From silicon reactant having at least one...

528 12, 528 31, 528 43, C08G 7706, C08G 7712

Patent

active

047743107

ABSTRACT:
A method for making siloxane resins consisting essentially of tetravalent SiO.sub.2 units and monovalent R.sub.3 SiO.sub.0.5 and H.sub.a R.sub.3-a SiO.sub.0.5 units wherein each R denotes an alkyl group or an aryl group having less than 9 carbon atoms and a denotes 1 or 2, comprises reacting in the presence of an acidic catalyst a siloxane resin consisting essentially of R.sub.3 SiO.sub.0.5 units and SiO.sub.2 units with (H.sub.a R.sub.3-a Si).sub.2 O, where R and a are as defined above. Novel resins wherein only 0.1 to 30 percent of the monovalent units have SiH groups are also disclosed.

REFERENCES:
patent: 2676182 (1954-04-01), Daudt
patent: 2857356 (1958-10-01), Goodwin
patent: 3627851 (1971-12-01), Brady
patent: 3772247 (1973-11-01), Flannigan
patent: 4310678 (1982-01-01), Blizzard et al.

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