Process for preparation of fluorinated sulfinates
Assignee3M Innovative Properties Company
InventorRudolf J. Dams
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Abstract
A process for preparation of a fluorinated sulfinate product by reacting a mixture comprising: (1) water; (2) dehalogenating and sulfinating reagent: and (3) fluoroaliphatic sulfonyl fluoride represented by the formula: Rf—[SO2F]n; and (4) at least one of the material selected from the group consisting of: (i) fluorinated surfactant, or (ii) organic cosolvent comprising, as the major component by weight of the organic solvent, alcohol having a boiling point of less than 110° C. at 760 torr; by heating the reaction mixture to a temperature between about 50° C. and 100° C. until the desired product yield is achieved. Also provided is a process of using the fluorinated sulfinate product as an initiation system for a free radical polymerization process, such as that used to prepare fluoropolymers.
Claims21
A process for preparing a fluorinated sulfinate product comprising the steps of:
- a) providing a reaction mixture comprising:
- (1) water;
- (2) dehalogenating and sulfinating reagent;
- (3) fluoroaliphatic sulfonyl fluoride represented by the formula:
- Rf—[SO2F]n
- wherein:
- Rf is a fluoroaliphatic group, and
- n is a number from about 1 to 4;
- and
- (4) at least one material selected from the group consisting of:
- (i) fluorinated surfactant, and
- (ii) organic cosolvent comprising, as the major component by weight, alcohol having a boiling point of less than 110° C. at 760 torr;
- and
- b) heating the reaction mixture to a temperature between 50° C. and 100° C. until the desired product yield is achieved.
A process for preparing a fluorinated sulfinate product comprising, reacting in water a fluoroaliphatic sulfonyl fluoride represented by the following formula:
- Rf—[SO2F]n
- wherein:
- Rf represents a fluoroaliphatic group, and n is a number from about 1 to 4;
- with a dehalogenating and sulfinating reagent at a temperature between 50° C. and 100° C. in the presence of fluorinated surfactant, and without organic cosolvent other than an alcohol, until the desired yield of product has been achieved.
Dependencies are inferred from the claim text.