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US 4,287,353 AGranted
Process for synthesizing silanol chain-stopped fluorosiloxane fluids
AssigneeGeneral Electric Company
InventorBen A. Bluestein
Life of this patent
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Abstract
A method for producing silanol chain-stopped fluoroalkyl polysiloxane fluids is disclosed. Fluoroalkyl substituted cyclic trisiloxanes are reacted with water, a catalyst and a polyethyleneglycol ether promoter to produce a fluorosilicone polymer of the desired molecular weight and viscosity.
Claims11
A process for producing a silanol chain-stopped fluorosilicone fluid, comprising:
- reacting at 25.degree. C. to 100.degree. C., 100 parts by weight of a cyclic fluorosiloxane trimer with a mixture of, approximately, 0.02 to 5.0 parts water and, approximately, 0.0050 to 0.10 parts polymerization catalyst and, approximately, 0.010 to 2.0 parts of polyethyleneglycol dimethyl ether promoter and adding an amount of neutralizer effective for stopping the polymerization at the desired viscosity.
A process for producing a silanol chain-stopped fluorosilicone fluid, comprising:
- reacting at 25.degree. C. to 100.degree. C., 100 parts by weight of a mixture of at least one type of fluoro-substituted cyclotrisiloxane and one or more types of trisiloxanes selected from the group consisting of dimethylsilicone cyclic trimer, methylvinylsilicone cyclic trimer, methylphenylsilicone cyclic trimer, and diphenylsilicone cyclic trimer;
- with a mixture of, approximately, 0.02 to 5.0 parts water and, approximately, 0.0050 to 0.10 parts polymerization catalyst and, approximately, 0.010 to 2.0 parts of polyethyleneglycol dimethyl ether promoter and adding an amount of neutralizer effective for stopping the polymerization at the desired viscosity.
Dependencies are inferred from the claim text.