Open-cell/microporous molded article
First Claim
1. A microporous molded article having an open-cell structure and comprising a thermoplastic material which possesses an inherent latent structural convertibility and includes effective pores of a diameter in the range from about 0.002 to 10 μ
- m, said thermoplastic material comprising at least about 70 percent by weight of a terpolymer which is composed of from about 20 to 80 percent by weight, relative to the total weight of the terpolymer, of copolymerized fluorinated olefin selected from the group consisting of ethylene and propylene, up to about 40 percent by weight, relative to the total weight of the terpolymer, of copolymerized olefin selected from the group consisting of ethylene and propylene, and from about 80 to 20 percent by weight, relative to the total weight of the copolymer, of copolymerized vinyl acetate, with at least 5 percent of the total proportion of acetate groups contained in the copolymer being converted by saponification into OH groups after copolymerization of the specified comonomers to form the terpolymer.
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Accused Products
Abstract
The present invention relates to molded articles of an open-cell structure, containing a copolymer which is comprised of copolymerized, fluorinated olefin, copolymerized vinyl acetate and optionally copolymerized olefin, the acetate groups of the copolymer being optionally saponified into OH groups. The molded articles possess an inherent latent structural convertibility and have effective pores of a diameter in the range from 0.002 to 10 μm. The invention further includes processes for the preparation of the specified molded articles and processes for converting their structure. The invention also relates to several uses of molded articles according to the invention.
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Citations
5 Claims
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1. A microporous molded article having an open-cell structure and comprising a thermoplastic material which possesses an inherent latent structural convertibility and includes effective pores of a diameter in the range from about 0.002 to 10 μ
- m, said thermoplastic material comprising at least about 70 percent by weight of a terpolymer which is composed of from about 20 to 80 percent by weight, relative to the total weight of the terpolymer, of copolymerized fluorinated olefin selected from the group consisting of ethylene and propylene, up to about 40 percent by weight, relative to the total weight of the terpolymer, of copolymerized olefin selected from the group consisting of ethylene and propylene, and from about 80 to 20 percent by weight, relative to the total weight of the copolymer, of copolymerized vinyl acetate, with at least 5 percent of the total proportion of acetate groups contained in the copolymer being converted by saponification into OH groups after copolymerization of the specified comonomers to form the terpolymer.
- View Dependent Claims (2, 3, 4)
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5. A molded article having an open-cell structure and comprising a thermoplastic material which possesses an inherent latent structural convertibility and includes effective pores of a diameter in the range from about 0.002 to 10 μ
- m, said thermoplastic material comprising at least about 70 percent by weight of a copolymer which is composed of from about 20 to 80 percent by weight, relative to the total weight of the copolymer, of copolymerized perfluorinated olefin from the group consisting of ethylene and propylene, from about 0 to 40 percent by weight, relative to the total weight of the copolymer, of copolymerized olefin from the group consisting of ethylene and propylene and from about 80 and 20 percent by weight, relative to the total weight of the copolymer, of copolymerized vinyl acetate, with at least 5 percent of the total proportion of acetate groups contained in the copolymer being converted by saponification into OH groups after copolymerization of the specified comonomers to form the copolymer.
Specification