Organosiloxane block copolymers

Details Organosiloxane block copolymers Organosiloxane block copolymers

1980-11-28

1982-10-26

Briggs, Sr., Wilbert J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528 14, C08G 7744, C08G 7708

Patent

active

043562930

ABSTRACT:
A process for preparing organosiloxane block copolymers which comprises reacting (a) an organopolysiloxane containing Si-bonded hydroxyl groups and having an average molecular weight of at least 800 g/mole, in which at least 80 mole percent of the units are siloxane units, and one valence of each silicon atom is satisfied by an SiC-bonded organic radical, while the remaining silicon valences are satisfied by siloxane oxygen atoms or hydroxyl groups, with (b) a diorganopolysiloxane having one Si-bonded hydroxyl group in each terminal unit and an average of at least 10 silicon atoms per molecule in the presence of (c) an organic solvent and (d) an alkali metal carbonate and/or an alkali metal carboxylate to form an organosiloxane block copolymer.

REFERENCES:
patent: 2588366 (1952-03-01), Dennett
patent: 3308203 (1967-03-01), Metevia et al.
patent: 3504051 (1970-03-01), McVannel

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