Barrier property enhancement of films and molded articles
AssigneeCiba-Geigy Corporation
InventorsGregory R. Coughlin, Robert A. Falk
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Abstract
An improvement in barrier properties of films and molded articles containing an organic polymer is achieved by incorporation therein of fluorochemicals, fluoropolymers or mixtures thereof, wherein said fluorochemicals or fluoropolymers contain greater than 40% fluorine by weight and exhibit less than 20% weight loss at 165.degree. C., as measured by thermogravimetric analysis at 20.degree. C. per minute in air. The films and molded articles in accordance with the present invention exhibit improved vapor and chemical barrier properties.
Claims15
A film or a molded article, having enhanced barrier properties, which film or molded article comprises
- (a) an organic polymer, and
- (b) an effective amount, sufficient to provide enhanced barrier properties to said organic polymer, of a fluorochemical selected from the group consisting of (R.sub.f CH.sub.2 CH.sub.2 S).sub.2, (R.sub.f CH.sub.2 CH.sub.2 SCH.sub.2).sub.2 C(CH.sub.2 OH).sub.2, tris(1,1,2,2-tetrahydro-C.sub.6 -C.sub.18 -perfluoroalkylethyl) citrate, 2,2-bis-[[(C.sub.6 -C.sub.18 -perfluoroalkyl-2-propenyl)oxy]methyl]-1-butanol or 3-[C.sub.6 -C.sub.18 -perfluoroalkyl-2-propenyl)oxy]-2,2-bis-[[C.sub.6 .varies.C.sub.18 -perfluoroalkyl-2-propenyl)oxy]methyl]-1-propanol, wherein said fluorochemical contains greater than 40% fluorine by weight and exhibits less than 20% weight loss at 165.degree. C., as measured by thermogravimetric analysis (TGA) at 20.degree. C./minute in air.
A process for improving the barrier properties of a film or a molded article containing an organic polymer, which process comprises the steps of
- (a) incorporating into the organic polymer an effective amount, sufficient to provide enhanced barrier properties to said organic polymer, of a fluorochemical selected from the group consisting of (R.sub.f CH.sub.2 CH.sub.2 S).sub.2, (R.sub.f CH.sub.2 CH.sub.2 SCH.sub.2).sub.2 C(CH.sub.2 OH).sub.2, tris(1,1,2,2-tetrahydro-C.sub.6 -C.sub.18 -perfluoroalkylethyl) citrate, 2,2-bis[[(C.sub.6 -C.sub.18 -perfluoroalkyl-2-propenyl)oxy]methyl]-1-butanol or 3-[C.sub.6 -C.sub.18 -perfluoroalkyl-2-propenyl)oxy]-2,2-bis-[[C.sub.6 -C.sub.18 -perfluoroalkyl-2-oxy]methyl]-1-propanol, wherein said fluorochemical contains greater than 40% fluorine by weight and exhibits less than 20% weight loss at 165.degree. C., as measured by thermogravimetric analysis (TGA) at 20.degree. C./minute in air;
- and
- (b) subsequently producing a film or a molded article therefrom.
Dependencies are inferred from the claim text.