Fluoropolymer compositions
AssigneeRhodia Operations
InventorsShujing Cheng, Arnaud Bourdette
Life of this patent
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Abstract
The present invention relates to a composition for solubilizing a fluoropolymer, comprising a solvent blend of a) Compound of formula (I) R1 C(=0)NR2R3 wherein R1 and R2 and R3 are defined as in the specification and b) DiMethylSulfoxide (DMSO). The invention also relates to the process for the preparation of the composition and its uses. The invention is also of use the fluoropolymer composition for coating applications.
Claims21
1- A composition, notably for solubilizing a fluoropolymer comprising a solvent blend of:
- a) Compound of formula (I):
- R1C(═O)NR2R3 (I)
- wherein:
- R1 is hydrogen or an aliphatic saturated group, that can be linear or branched, having 1 to 6 carbon atoms, eventually substituted by one or more functional groups selected from a group consisting of —OH, —OR, —C(═O)OR and —C(═O)NR4R5, R being an alkyl group having 1 to 6 carbon atoms, and R4 and R5, identical or different, being methyl or ethyl groups;
- R2 and R3, identical or different, being methyl or ethyl groups;
- R1 and R2 and R3 being able to form a cycle comprising 4 to 6 carbon atoms eventually substituted by one or more functional groups selected from a group consisting of —OH, —OR, —C(═O)OR and —C(═O)NR4R5, R being an alkyl group having 1 to 6 carbon atoms, and R4 and R5, identical or different, being methyl or ethyl groups;
- and
- b) DiMethylSulfoxide (DMSO).
2- The composition according to claim 1, wherein R1 is a group of formula —Z—C(═O)OR′, with Z is a linear or branched divalent alkylene group comprising 2 to 5 carbon atoms and R′ is an alkyl group comprising 1 to 4 carbon atoms.
3- The composition according to claim 1, the compound of formula (I) is MeO(O═)C—Z—C(═O)NR2R3, wherein Z, R2 and R3 are previously defined.
4- The composition according to claim 1, the compound of formula (I) is a blend comprising:
- a compound of formula (I) wherein R1 is —CH(CH2—CH3)—CH2—C(=O)OMe,
- a compound of formula (I) wherein R1 is —CH2—CH(CH2—CH3)—C(═O)OMe,
- a compound of formula (I) wherein R1 is —CH(CH3)—CH2—CH2—C(═O)OMe, and
- a compound of formula (I) wherein R1 is —CH2—CH2—CH(CH3)—C(═O)OMe.
5- The composition according to claim 4, wherein said blend also comprises a compound of formula (I) wherein R1 is —(CH2)4—C(═O)OMe.
6- The composition according to claim 1, wherein said compound of formula (I) is R4R5NC(═O)—Z—C(═O)NR2R3, wherein R2, R3, R4 and R5 are previously defined.
7- The composition according to claim 1, wherein said compound of formula (I) is a blend of:
- RO(O═)C—Z—C(═O)NR2R3;
- and
- R4R5NC(═O)—Z—C(═O)NR2R3,
- wherein R, R2, R3, R4, R5 and Z are previously defined.
8- The composition according to claim 1, herein the weight ratio between the compound of formula (I) and DMSO is of from 1/99 to 99/1.
9- The composition according to claim 1, comprising a solubilized fluoropolymer.
10- The composition according to claim 1, wherein the fluoropolymer is polyvinylidenefluoride (PDVF) and copolymer of vinylidene fluoride with comonomers hexafluoropropylene (HFP) and/or chlorotrifluoroethylene (CTFE).
11- The composition according to claim 10, wherein the amount of fluoropolymer is of from 0.1 to 15% by weight.
12- A process of preparing a composition according to claim 1, comprising the steps of:
- preparing the solvent blend by mixing a compound of formula (I) and dimethylsulfoxyde,
- introducing the solvent blend into the fluoropolymer, under stirring,
- heating the mixture at a temperature from room temperature to a temperature equal to or below 100° C.
13- A process of preparing a composition according to claim 1, comprising the steps of:
- preparing the solvent blend by mixing a compound of formula (I) and dimethylsulfoxyde,
- heating the solvent blend at a temperature from room temperature to a temperature equal to or below 100° C.
- introducing the fluoropolymer into the solvent blend.
14- The process according to claim 12, further comprising the steps of:
- cooling down the mixture.
15- A method of preparing a membrane, a foam, a binder of a substrate coating comprising the step of preparing a membrane, a foam, a binder or a coating using the composition as claimed in claim 9, as a raw material for said membrane, said foam, said binder or said coating.
16- A process for coating a substrate comprising the steps of applying the composition of the invention as claimed in claim 1, onto one or two sides of the substrate or parts thereof and removing the solvent.
17- The process according to claim 16 wherein the substrate is a battery separator material.
18- A method of recycling fluoropolymer comprising the step of using the composition as claimed in claim 1 in the recovery of fluoropolymers from a backing of a photovoltaic panel or wire coatings.
19- A method of cathode and anode electrode slurry making process for lithium-ion batteries comprising the step of using the composition as claimed in claim 1 as a binder material.
20- A method for making cathode and anode electrode slurry for lithium-ion batteries comprising a step of mixing active material powder, binder material, solvent and additives into a slurry or paste and pumping said slurry to a coating machine, wherein said binder material is a composition according to claim 1.
21- The process according to claim 13, further comprising the step of:
- cooling down the mixture.