Coextrusion of thermoplastic fluoropolymers with thermoplastic polymers
AssigneeAusimont, U.S.A., Inc.
InventorsFerdinand A. DeAntonis, William H. Murrell
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Abstract
The present invention is a multilayered coextruded film and process of coextruding. The coextruded film comprises at least one thermoplastic fluoropolymer layer and at least one thermoplastic polymeric layer adjacent to the thermoplastic fluoropolymer layer. There is preferably a coextruded adhesive layer between each thermoplastic fluoropolymer layer and each thermoplastic polymeric layer. The coextruded film can be oriented in at least one direction and/or embossed without delamination, fibrillating, or splitting.
Claims28
A multilayered coextruded film comprising at least one thermoplastic fluoropolymer layer wherein the thermoplastic fluoropolymer is selected from the class consisting of ethylene/chlorotrifluoroethylene copolymer ethylene/tetrafluoroethylene copolymer and fluorinated ethylene-propylene copolymer, and at least one thermoplastic polymer layer made from a coextrusion compatible thermoplastic selected from the class consisting of polyamide, and ethylene vinyl alcohol copolymer layer, and an adhesive selected from the group consisting of ethylene vinyl acetate copolymer, olefin and ester copolymers, copolymers of polyolefins and carboxylic acid containing groups, and mixtures thereof, between the thermoplastic polymeric layer and the thermoplastic fluoropolymer layer wherein each layer is from 0.05 to 250 mils thick and wherein the fluoropolymer was coextruded at a temperature from 500.degree. F. to 530.degree. F. and the thermoplastic polymer was coextruded at a temperature from 450.degree. F. to 520.degree. F.
A multilayered coextruded film comprising at least one thermoplastic fluoropolymer layer wherein the thermoplastic fluoropolymer is selected from the class consisting of ethylene chlorotrifluoroethylene copolymer, ethylene tetrafluoroethylene copolymer and fluorinated ethylene-propylene copolymer, and at least one coextrusion compatible thermoplastic polymer, and an adhesive selected from the group consisting of ethylene vinyl acetate copolymer, olefin and ester copolymers, copolymers of polyolefins and carboxylic acid containing groups, and mixtures thereof, between the thermoplastic fluoropolymer layer and the thermoplastic polymeric layer, wherein each layer is from 0.05 to 250 mils thick and wherein the fluoropolymer is coextruded at a temperature from 500.degree. F. to 530.degree. F. and the thermosplastic polymer is coextruded at a temperature from 450.degree. F. to 520.degree. F.
A process of coextruding a multilayer film comprising the steps of coextruding at least one thermoplastic fluoropolymer layer wherein the thermoplastic fluoropolymer is selected from the class consisting of ethylene/chlorotrifluoroethylene copolymer, ethylene/tetrafluoroethylene copolymer, and fluorinated ethylene-propylene copolymer, and at least one coextrusion compatible thermoplastic polymeric layer, wherein the thermoplastic polymeric layer is made from a thermoplastic selected from the class consisting of polyamide and ethylene vinyl alcohol copolymer layer, and an adhesive selected from the group consisting of ethylene vinyl acetate copolymer, olefin and ester copolymers, copolymers of polyolefins and carboxylic acid containing groups, and mixtures thereof between the thermoplastic fluoropolymer layer and the thermoplastic polymeric layer, wherein each layer is from 0.05 to 250 mils thick, and wherein the fluoropolymer is coextruded at a temperature from 500.degree. F. to 530.degree. F. and the thermoplastic polymer is coextruded at a temperature from 450.degree. F. to 520.degree. F.
A process of coextruding a multilayered film comprising the steps of coextruding at least one fluoropolymer layer wherein the fluoropolymer is selected from the class consisting of polychlorotrifluoroethylene, ethylene chlorotrifluoroethylene copolymer, ethylene tetrafluoroethylene copolymer, and fluorinated ethylene-propylene copolymer and at least one coextrusion compatible thermoplastic polymeric layer, and an adhesive selected from the group consisting of ethylene vinyl acetate copolymer, olefin and ester copolymers, copolymers of polyolefins and carboxylic acid containing groups, and mixtures thereof, between the thermoplastic fluoropolymer layer and the thermoplastic polymeric layer, and wherein each layer is from 0.05 to 250 mils thick, and wherein the fluoropolymer is coextruded at a temperature from 500.degree. F. to 530.degree. F. and the thermoplastic polymer is coextruded at a temperature from 450.degree. F. to 520.degree. F.
Dependencies are inferred from the claim text.