Coextrusion of thermoplastic fluoropolymers with thermoplastic polymers

Claim 2

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° F. to 530° F. and the thermoplastic polymer was coextruded at a temperature from 450° F. to 520° F.

Claim 3

The film as recited in claim 1 wherein the film is embossed.

Claim 4

The film as recited in claim 1 wherein the film is embossed.

Claim 5

The film as recited in claim 1 wherein the thermoplastic polymeric layer is made from a polyamide.

Claim 6

The film as recited in claim 1 wherein the thermoplastic polymeric layer is made from ethylene vinyl alcohol copolymer.

Claim 7

The film as recited in claim 1 wherein the adhesive layer comprises a mixture of at least one modified polyolefin.

Claim 8

The film as recited in claim 6 wherein there are at least two modified polyolefins which are modified ethylene vinyl acetate copolymers.

Claim 9

The film as recited in claim 1 wherein the film is oriented in at least one direction.

Claim 10

The film as recited in claim 8 wherein the film is monoaxially oriented.

Claim 11

The film as recited in claim 8 wherein the film is biaxially oriented.

Claim 12

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° F. to 530° F. and the thermosplastic polymer is coextruded at a temperature from 450° F. to 520° F.

Claim 13

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° F. to 530° F. and the thermosplastic polymer is coextruded at a temperature from 450° F. to 520° F.

Claim 14

The film as recited in claim 11 wherein the thermoplastic polymeric layer is made from a thermoplastic selected from the class consisting of polyamide, polyethylene, polypropylene, polyolefin copolymers, ionomers, polystyrenes, polycarbonates, acrylic polymers and copolymers, and fluoropolymers.

Claim 15

The film as recited in claim 12 wherein there is a first modified ethylene vinyl acetate copolymer having a melt index of from about 0.1 to 10 g/10 minutes and the second modified ethylene vinyl acetate copolymer having a melt index from 5 to 1200 g/10 minutes, the second modified ethylene vinyl acetate.

Claim 16

The multilayer coextruded film of claim 11 wherein the thermoplastic fluoropolymer layer is selected from the class consisting of ethylene tetrafluoroethylene copolymer and ethylene chlorotrifluoroethylene copolymer and the thermoplastic polymer is selected from the class of polyamides and polyolefins.

Claim 17

The multilayered coextruded film as recited in claim 14 wherein the polyamide is polyepsiloncaprolactam and the polyolefin is ethylene vinyl alcohol copolymer.

Claim 18

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° F. to 530° F. and the thermoplastic polymer is coextruded at a temperature from 450° F. to 520° F.

Claim 19

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° F. to 530° F. and the thermoplastic polymer is coextruded at a temperature from 450° F. to 520° F.

Claim 20

The process as recited in claim 16 further comprising the step of embossing the film.

Claim 21

The process as recited in claim 16 wherein the thermoplastic polymeric layer is made from a polyamide.

Claim 22

The process as recited in claim 16 wherein the thermoplastic polymeric layer is made from ethylene vinyl alcohol copolymers.

Claim 23

The process as recited in claim 16 further comprising the step of orienting the film in at least one direction.

Claim 24

The process as recited in claim 10 further comprising the step of embossing the oriented film laminate.

Claim 25

The process as recited in claim 20 wherein the film is monoaxially oriented.

Claim 26

The process as recited in claim 21 wherein the film laminate is biaxially oriented.

Claim 27

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° F. to 530° F. and the thermoplastic polymer is coextruded at a temperature from 450° F. to 520° F.

Claim 28

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° F. to 530° F. and the thermoplastic polymer is coextruded at a temperature from 450° F. to 520° F.

Claim 29

The process of claim 24 wherein the thermoplastic polymer is polyepsiloncaprolactam, the fluoropolymer is ethylene chlorotrifluoroethylene and the adhesive is a modified ethylene vinyl acetate copolymer, and the process further comprises coextruding the ethylene chlorotrifluoroethylene copolymer at a temperature range of 500° F. to 530° F. coextruding the polyepsiloncaprolactam at a temperature range of 470° F. to 520° F., and coextruding the adhesive layer at from 450° F. to 470° F.

Claim 30

The process of claim 24 wherein the thermoplastic polymer is ethylene vinyl alcohol the fluoropolymer is ethylene chlorotrifluoroethylene and the adhesive is a modified ethylene vinyl acetate copolymer, and the process further comprises coextruding the ethylene chlorotrifluoroethylene copolymer at a temperature range of 500° F. to 530° F. coextruding the ethylene vinyl alcohol at a temperature range of 450° F. to 470° F., and coextruding the adhesive layer at from 450° F. to 470° F.

Claim 31

The process recited in claim 24 wherein the fluoropolymer is ethylene chlorotrifluoroethylene copolymer.

Claim 32

The process of claim 27 further comprising coextruding an adhesive layer at a temperature less than 470° F. between the thermoplastic fluoropolymer and the thermoplastic polymer.