Process for the processing of a perfluoropolymer material
The present disclosure relates to a process for the processing of perfluoropolymer materials, and to the use of the resultant products in different potential applications, such as in the medical device field. The process can include, for example, the steps of: (i) dissolving one or more uncured perfluoropolymer materials in a solvent containing one or more liquid perfluorinated solvent(s) to form a solution; (ii) optionally adding one or more porogens and/or one or more functional additives to the solution formed in (i) to form a mixture; (iii) applying the resultant solution or mixture formed in steps (i) and (ii) to a substrate to form one or more partial or continuous deposited layers on the substrate; (iv) curing the perfluoropolymer within the deposited layer to form a perfluoroelastomeric product; and (v) optionally removing the porogen from the perfluoroelastomeric product.
1. A process for the processing of a perfluoropolymer material, the process comprising the steps of:
i) Dissolving one or more uncured perfluoropolymer materials in a solvent containing one or more liquid perfluorinated solvent(s) to form a solution;
ii) Applying the resultant solution formed in step (i) to a substrate to apply multiple depositions on the substrate, wherein an amount of energy is applied directly only to the substrate to raise the temperature of the multiple depositions to a temperature sufficient to at least partially remove the solvent from the multiple depositions while the resultant solution formed in step (i) is applied in multiple depositions, wherein the substrate comprises a metallic mandrel, a non-metallic mandrel, a metallic implant, or a non-metallic implant; and
(iii) Curing the perfluoropolymer materials within the multiple depositions to form a perfluoroelastomeric product.
2. A process according to claim 1 , wherein the one or more perfluoropolymer materials comprise one or more selected from tetrafluoroethylene (TFE), hexafluoropropylene (HFP), and perfluoroalkylvinyl ethers (PAVEs), or a perfluoroalkoxyvinyl ether.
3. A process according to claim 2 , wherein the perfluoroalkylvinyl ethers contain alkyl groups that are either straight or branched, and which include one or more ether linkages selected from perfluoro (methyl vinyl ether), perfluoro (ethyl vinyl ether), perfluoro (propyl vinyl ether).
4. A process according to claim 1 , wherein the perfluoroelastomeric product comprises a crosslinked terpolymer of tetrafluoroethylene, a perfluoroalkylvinyl ether, and at least one perfluorinated curesite monomer which incorporates a functional group to permit crosslinking of the terpolymer.
5. A process according to claim 4 , wherein the curesite monomer comprises a cyano, a bromo, iodo or pentafluorophenoxy functional group.
6. A process according to claim 1 , wherein the resultant solution from step (i) is applied to the substrate in step (ii) using a method selected from:
Pneumatic spraying
Electrostatically focused pneumatic spraying
Electrospraying
Ultrasonic spraying
Syringing
Electrostatic spinning
Inkjet printing
Brushing/painting.
7. A process according to claim 1 , wherein in step (i) only one solvent is used.
8. A process according to claim 1 , wherein the solvent is completely removed.
9. A process according to claim 1 , wherein the step (iii) of curing the perfluoropolymer materials is carried out when the perfluoropolymer materials are on the substrate.
10. A process according to claim 1 , wherein the step (iii) of curing the perfluoropolymer materials is carried out when the perfluoropolymer materials are not on the substrate.
11. A process according to claim 1 , further comprising adding one or more porogens and/or one or more functional additives to the solution formed in step (i).
12. A process according to claim 11 , further comprising a step of removing the porogen from the perfluoroelastomeric product after step (iii).
13. A process according to claim 11 , wherein the one or more porogens comprise one or more materials selected from sodium chloride, salicylic acid, lactose, valine, sodium bicarbonate, sodium hydrogen carbonate, calcium carbonate, glycine, polyethylene oxide, polyethylene glycol (PEG), polyvinylpyrrolidone, polyvinyl chloride, and/or titanium dioxide.
14. A process according to claim 1 , further comprising a step (iv) of forming a product consisting of the perfluoroelastomeric product.
15. A process according to claim 1 , further comprising a step of adding one or more porogens to the solution formed in step (i) to form a mixture.
16. A process according to claim 1 , further comprising a step of adding one or more functional additives to the solution formed in step (i) to form a mixture.
17. A process according to claim 16 , wherein the functional additive comprises one or more selected from co-agents, processing aids, fillers, acid acceptors, cure accelerators, glass fibers, polyaramid fibers, curatives and/or plasticizers.