Biosourced vinylidene difluoride monomer and polymers containing it
The invention relates to biosourced vinylidene difluoride. The invention also relates to methods for preparation of biosourced vinylidene difluoride from various renewable raw materials. The invention also relates to homopolymers of vinylidene difluoride obtained from polymerization of said monomer, and also copolymers obtained by copolymerization of said monomer with one or several compatible comonomers. Finally, the invention relates to the use of said homopolymers or copolymers in applications, such as chemical engineering or electronics, in particular mass-market electronic devices.
1. A biosourced vinylidene difluoride characterized in that the renewable carbon concentration is at least 1% by atom, as determined by the 14 C concentration according to the NF EN 16640 standard.
2. The biosourced vinylidene difluoride according to claim 1 , wherein the renewable carbon concentration is greater than 5.
3. A method for the preparation of biosourced vinylidene difluoride according to claim 1 comprising a step of providing biosourced ethylene or acetylene having a renewable carbon concentration of at least 1%, and the transformation into biosourced vinylidene difluoride by multistep synthesis wherein the first step of synthesis consists of the production of biosourced vinyl chloride monomer (VCM) from said biosourced ethylene or acetylene.
4. A method for the preparation of biosourced vinylidene difluoride according to claim 1 comprising a step of providing biosourced acetylene having a renewable carbon concentration of at least 1%, and the transformation into biosourced vinylidene difluoride by multistep synthesis wherein the first step of synthesis consists of the production of vinyl chloride monomer (VCM) biosourced from this biosourced acetylene.
5. The method according to claim 3 comprising the following sequence of steps:
Production of biosourced T112 (1,1,2-trichloroethane) by cold chlorination with Cl 2 from the biosourced VCM:
CH 2 ═CHCl+Cl 2 →CH 2 Cl—CHCl 2
Production of biosourced T111 (1,1,1-trichloroethane) from biosourced T112:
CH 2 Cl—CHCl 2 →CCl 3 —CH 3
Production of biosourced 142 b (1,1,1-chlorodifluoroethane) from biosourced T111 and reaction with HF:
CCl 3 —CH 3 +2HF→CH 3 —CF 2 Cl+2HCl
Production of biosourced vinylidene difluoride (VDF or CF 2 ═CH 2 ) from biosourced 142 b by thermal dehydrochlorination:
CH 3 —CF 2 Cl→CF 2 ═CH 2 +HCl.
6. The method according to claim 3 comprising the following sequence of steps:
Production of biosourced T112 (1,1,2-trichloroethane) by cold chlorination with Cl 2 from the biosourced VCM:
CH 2 ═CHCl+Cl 2 →CH 2 Cl—CHCl 2
Production of biosourced CV2 (1,1-dichloroethene or CH 2 ═CCl 2 ) from biosourced T112 by dehydrochlorination by NaOH with production of brine:
CH 2 Cl—CH 2 Cl 2 +NaOH→CH 2 ═CCl 2 +NaCl+H 2 O
Production of biosourced 142 b (1,1,1-chlorodifluoroethane) from biosourced CV2 by fluoridation:
CH 2 ═CCl 2 +2HF→CH 3 —CF 2 Cl+HCl
Production of biosourced vinylidene difluoride (VDF or CF 2 ═CH 2 ) from biosourced 142 b by thermal dehydrochlorination:
CH 3 —CF 2 Cl→CF 2 ═CH 2 +HCl.
7. The method according to claim 3 comprising the following sequence of steps:
Production of biosourced D11 (1,1-dichloroethane) from the biosourced VCM by hydrochloridation:
CH 2 ═CHCl+HCl→CHCl 2 —CH 3
Production of biosourced T111 (1,1,1-trichloroethane) from biosourced D11 by chlorination:
CHCl 2 —CH 3 +Cl 2 →CCl 3 —CH 3 +HCl
Production of biosourced 142 b (1,1,1-chlorodifluoroethane) from biosourced T111 and reaction with HF:
CCl 3 —CH 3 +2HF→CH 3 —CF 2 Cl+2HCl
Production of biosourced vinylidene difluoride (VDF or CF 2 ═CH 2 ) from biosourced 142 b by thermal dehydrochlorination:
CH 3 —CF 2 Cl→CF 2 ═CH 2 +HCl.
8. A vinylidene difluoride homopolymer or copolymer comprising the biosourced vinylidene difluoride units according to claim 1 .
9. The vinylidene difluoride homopolymer according to claim 8 consisting of the biosourced vinylidene difluoride units.
10. The fluoridated copolymers of claim 8 comprising the biosourced vinylidene difluoride units and one or more comonomer units compatible with vinylidene difluoride.
11. The fluoridated copolymers according to claim 10 , wherein the comonomers of the vinylidene difluoride are selected from the group consisting of vinyl fluoride, tetrafluoroethylene, hexafluoropropylene, trifluoropropenes, hexafluoroisobutylene, perfluorobutylethylene, pentafluoropropenes perfluoroalkylvinylethers with general formula Rf—O—CF—CF 2 , where Rf is an alkyl group.
12. An article of manufacture comprising the homopolymer or copolymer of claim 8 , wherein the article is an electronic article.
13. The article of claim 12 wherein the vinylidene difluoride homopolymer or copolymer comprises from 5 to 100% by mass of total polymer in the article.
14. The article of claim 13 wherein the vinylidene difluoride homopolymer or copolymer comprises from 5 to 70% by mass of total polymer in the article.