Method for making block siloxane copolymers

Patent · Fri Jan 01 04:00:00 EST 1982

OSTI ID:864330

Butler, Nora ^[1]; Jessop, Edward S ^[1]; Kolb, John R ^[1]

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1. Livermore, CA

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.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• DOE Contract Number: W-7405-ENG-48
• Assignee: United States of America as represented by Department of Energy (Washington, DC)
• Patent Number(s): US 4348504
• OSTI ID: 864330
• Country of Publication: United States
• Language: English

Related Subjects

/525/528/
block
blocked
catalyst
compound
condensation
condensation polymerization
copolymers
diorganoscyclosiloxanes
end-blocking
end-cap
formed
interacted
introduced
method
polymerization
polymerization catalyst
polymers
polysiloxane
prepolymer
prepolymers
presence
producing
resulting
silanediol
siloxane
siloxane copolymers
subsequently
synthesizing