Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1981-02-25
1982-09-07
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 22, 528 32, 528 33, 528 37, C08G 6700, C08G 7708, C08G 7732
Patent
active
043485049
ABSTRACT:
A method for synthesizing block polysiloxane copolymers. Diorganoscyclosiloxanes and an end-blocking compound are interacted in the presence of a ring opening polymerization catalyst, producing a blocked prepolymer. The prepolymer is then interacted with a silanediol, resulting in condensation polymerization of the prepolymers. A second end-blocking compound is subsequently introduced to end-cap the polymers and copolymers formed from the condensation polymerization.
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Butler Nora
Jessop Edward S.
Kolb John R.
Besha Richard G.
Briggs Sr. Wilbert J.
Gaither Roger S.
King Patrick T.
The United States of America as represented by the Department of
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