Liquid copolymeric organopolysiloxanes comprising SiO.sub.2 and

Details Liquid copolymeric organopolysiloxanes comprising SiO.sub.2 and Liquid copolymeric organopolysiloxanes comprising SiO.sub.2 and

1980-12-02

1982-01-12

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

C07F 708

Patent

active

043106781

ABSTRACT:
Copolymeric organopolysiloxanes comprising SiO.sub.2 are prepared by forming an acidic, homogeneous mixture of a silanol-containing resinous copolymeric siloxane comprising R.sub.3 SiO.sub.1/2 siloxane units and SiO.sub.2 siloxane units, an organohydrogenpolysiloxane and an organic solvent and heating the resulting mixture to remove substantially all of the organic solvent. The copolymeric organosiloxanes contain silicon-bonded hydroxyl radicals and/or silicon-bonded hydrogen radicals in varying amounts which depends upon the acidity of the homogeneous mixture that is formed and the ratio of silicon-bonded hydrogen radicals to silicon-bonded hydroxyl radicals therein. The copolymeric organopolysiloxanes are useful as a reactive component in various types of curable silicone compositions.

REFERENCES:
patent: 2676182 (1954-04-01), Daudt et al.
patent: 2814601 (1957-11-01), Currie et al.
patent: 3205283 (1965-09-01), Modic
patent: 3627851 (1971-12-01), Brady
patent: 3772247 (1973-11-01), Flannigan
patent: 3992426 (1976-11-01), Johnson et al.

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