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US 5,202,480 AGranted
Fluorination of acetals, ketals and orthoesters
AssigneeExfluor Research Corporation
InventorsThomas R. Bierschenk, Timothy Juhlke, Hajimu Kawa, Richard J. Lagow
Life of this patent
Estimating the term…
Abstract
This invention pertains to perfluoropolyethers and perhalogenated chlorofluoroether polymers that can be prepared by fluorinating polymers made by the polymerization of acetals, ketals, polyacetals, polyketals and orthoesters with elemental fluorine.
Claims4
A perhalogenated polyether having an average formula:
- ##STR25## wherein X i selected from the group consisting of --(CF.sub.2).sub.r COOH, --(CF.sub.2).sub.r OCF.sub.3, --(CF.sub.2).sub.r COF and -C.sub.r F.sub.2r+1 -q where r is an integer from 1 to 12 and q is an integer from 0 to 25;
- wherein n is an integer from 1 to 50;
- and wherein R is selected from the group consisting of --F, --CF.sub.2 Cl, --CFCl.sub.2, CCl.sub.3 and perfluoroalkyl on one to ten carbons.
A perhalogenated polyether having an average formula:
- ##STR26## wherein X is selected from the group consisting of --(CF.sub.2).sub.r COOH, --(CF.sub.2).sub.r OCF.sub.3, --(CF.sub.2).sub.r COF and -C.sub.r F.sub.2r+1-q Cl.sub.q where r is an integer from 1 to 12 and q is an integer from 0 to 25;
- wherein n is an integer from 1 to 50;and wherein R is selected from the group consisting --F, --CF.sub.2 Cl, --CFCl.sub.2, CCl.sub.3 and perfluoroalkyl of one to ten carbons.
A perhalogenated polyether having an average formula:
- ##STR27## wherein X and Z are the same or different and are selected from the group consisting of --(CF.sub.2).sub.r COF, --((CF.sub.2).sub.r OCF.sub.3, --(CF.sub.2 O.sub.r COOH and --C.sub.r F.sub.2r+1-q Cl.sub.q, wherein r is an integer from 1 to 12 and q is an integer from 0 to 25, wherein R.sub.1 and R.sub.2 are the same or different and are selected from the group consisting of --F, --Cl, --CF.sub.2 Cl, --CFCl.sub.2, --CCl.sub.3, perfluoroalkyl of one to ten carbon atoms and perfluoroalkoxyalkyl of one to ten carbon atoms, wherein one or more of the fluorine atoms may be substituted by a halogen atom or other than fluorine, provided that R.sub.1 and R.sub.2 together are not F, wherein n is an integer from 2 to 1000.
A perhalogenated polyether having an average formula:
- ##STR28## wherein X and Z are the same or different and are selected from the group consisting of --(CF.sub.2 O.sub.r COF, --(CF.sub.2).sub.r OCF.sub.3, --(CF.sub.2).sub.r COOH and --C.sub.r F.sub.2r+1-q Cl.sub.q, wherein r is an integer from 1 to 12 and q is an integer rom 0 to 25, and wherein n is an integer greater than 20.
Dependencies are inferred from the claim text.