Minnesota Mining and Manufacturing Company

3m Innovative Properties Company

Douglas S Parker

William D Coggio

Dirk H Arren

Tatsuo Fukushi

Timothy M Dietz

Allan T Worm

Daniel R Fronek

Trang D Pham

Keizo Yamanaka

Constance J Nelson

A multi-layer article comprising a substrate and a dehydrofluorinated fluoropolymer, wherein the dehydrofluorinated polymer contains substantially no grafted adhesion-promoting groups, and the dehydrofluorinated fluoropolymer contains sufficient carbon-carbon unsaturation to increase the adhesion between the dehydrofluorinated fluoropolymer and the substrate.

Method of improving adhesion between a fluoropolymer and a substrate

A curable composition that includes (a) at least one curable polymer comprising interpolymerized units derived from vinylidene fluoride; and (b) at least one cure accelerator comprising a silyl-functional onium salt, and a method for curing such compositions.

Curable compositions containing silyl-functional onium cure accelerators

A compound having the formula: ##STR1## where Q is an onium ion; A.sup.- is a counterion; R.sup.1, R.sup.2, R.sup.3, and R.sup.4, independently, comprise (a) a non-fluorinated alkyl, cycloalkyl, aryl, or aralkyl group; (b) an onium-containing group; or (c) a group having the formula --(CH.sub.2).sub.n --Y--R.sup.5 in which n is at least two; Y is a spacer arm comprising a --CH.sub.2 --, --O--, --OCH.sub.2 --, --S--, --SO.sub.2 --, or --Z--SO.sub.2-- group; Z is an --R.sup.6 --O--, --N(R.sup.7)--, or --N(H)-- group; R.sup.6 is a substituted or unsubstituted phenylene group; R.sup.7 is a non-fluorinated alkyl, cycloalkyl, aryl, or alkaryl group; and R.sup.5 is a fluorinated group, perfluorinated group, or combination thereof, with the proviso that (i) at least one of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 comprises a group having the formula --(CH.sub.2).sub.n --Y--R.sup.5 ; (ii) the total number of fluorine atoms in said compound is at least 5; and (iii) when Q is a sulfonium ion, there is no R.sup.4 group. The invention further includes curable compositions comprising vinylidene fluoride-containing polymers and the above-described compounds, as well as a method for curing such compositions.

Fluorinated onium salts, curable compositions containing same, and

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Afton, MN, United States of America

Douglas S Parker