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1. (WO2018224881) COPOLYMÈRE SÉQUENCÉ STYRÉNIQUE RÉTICULÉ
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

1. An elastomeric styrenic block copolymer (SBC) composition comprising one or more SBCs and one or more polymers miscible with styrenic end blocks of the one or more SBCs;

wherein said block copolymer composition is both physically and chemically crosslinked;

wherein said chemical crosslinking comprises covalent bonds between chains of SBC and;

wherein said physical crosslinking comprises non-covalent interaction between styrenic end blocks of the one or more SBCs and the one or more polymers miscible with the styrenic end blocks.

2. An elastomeric styrenic block copolymer composition comprising:

one or more SBCs;

one or more polymers miscible with one or more polystyrene end blocks of the one or more SBCs; and

one or more cross-linking agents capable of inducing covalent bonding between chains of the one or more SBCs.

3. A miscible polymer blend comprising one or more SBCs and one or more polymers miscible with styrenic end blocks of the one or more SBCs;

wherein said miscible polymer blend is both physically and chemically crosslinked;

wherein said chemical crosslinking comprises covalent bonds between chains of SBC and;

wherein said physical crosslinking comprises non-covalent interaction between styrenic end blocks of the one or more SBCs and the one or more polymers miscible with the styrenic end blocks.

4. A method of preparing a SBC composition comprising the step of:

combining one or more SBCs, one or more polymers miscible with one or more polystyrene end blocks of the one or more SBCs; and one or more cross-linking agents capable of inducing covalent bonding between chains of the one or more SBCs.

5. The composition according to claim 1 or claim 2, the blend according to claim 3, or the method according to claim 4, further comprising one or more plasticizers and/or flexibilizers compatible with an elastomeric mid-block of the one or more SBCs.

6. The composition according to any one of claims 1 , 2 or 5, the blend according to any one of claims 3 or 5, or the method according to any one of claims 4 or 5, wherein, independently, the one or more SBCs comprise a fully unsaturated, partially unsaturated or fully saturated elastomeric mid-block.

7. The composition according to any one of claims 1 , 2, 5 or 6, the blend according to any one of claims 3, 5 or 6, or the method according to any one of claims 4 to 6, wherein the one or more SBCs comprise a fully saturated elastomeric mid-block, said fully saturated elastomeric mid-block being cleavable when exposed to radiation, for example electron beam radiation.

8. The composition according to any one of claims 1 , 2 or 5 to 7, the blend according to any one of claims 3 or 5 to 7, or the method according to any one of claims 4 to 7, wherein the one or more SBCs is selected from the group consisting of SIS, SBS, SIBS, S-isobutylene-S, SEBS, SEPS, SEEPS or a SBC functionalized with reactive groups grafted in the middle rubber block such as, for example, carboxylic acid, amine, alcohol, maleic anhydride, epoxy, isocyanate and aziridine groups and mixtures thereof.

9. The composition according to any one of claims 1 , 2 or 5 to 8, the blend according to any one of claims 3 to 8, or the method according to any one of claims 4 to 8, wherein the one or more SBCs has a molecular weight (Mn) above 100,000 g/mol.

10. The composition according to any one of claims 1 , 2 or 5 to 9, the blend according to any one of claims 3 to 9, or the method according to any one of claims 4 to 9, wherein at least one SBC has an elastomeric mid-block containing reactive functionalities, such as carbon-carbon double bonds.

11. The composition according to any one of claims 1 , 2 or 5 to 10, the blend according to any one of claims 3 to 10, or the method according to any one of claims 4 to 10, wherein the number average molecular weight of the miscible polymer (Mn) is below 10,000 g/mol and more preferably below 3,000 g/mol.

12. The composition according to any one of claims 1 , 2 or 5 to 1 1 , the blend according to any one of claims 3 to 1 1 , or the method according to any one of claims 4 to 1 1 , wherein the miscible polymer has a broad molecular weight polydispersity index, for example greater than 2.0, or greater than 3.0, or greater than 4.0, or greater than 5.0.

13. The composition according to any one of claims 1 , 2 or 5 to 12, the blend according to any one of claims 3 to 12, or the method according to any one of claims 4 to 12, wherein the miscible polymer is selected from the group consisting of polystyrene resin, coumarone-indene resin, polyindene resin,

poly(methylindene) resin, vinyltoluene-alphamethylstyrene resin,

alphamethylstyrene resin, polyphenylene ether, copolymers of alkyl arene monomers such as alpha methyl styrene and para methyl styrene, rosin ester, styrenated terpenes, polyterpenes, terpene phenolics and mixtures thereof.

14. The composition according to any one of claims 1 , 2 or 5 to 13, the blend according to any one of claims 3 to 13, or the method according to any one of claims 4 to 13, wherein at least one SBC comprises, in its elastomeric mid-block, double bonds, to enable chemical crosslinking; and wherein the one or more miscible polymers is selected from the group consisting of polystyrene resin, coumarone-indene resin, polyindene resin, poly(methylindene) resin, vinyltoluene-alphamethylstyrene resin, alphamethylstyrene resin, polyphenylene ether, copolymers of alkyl arene monomers such as alpha methyl styrene and para methyl styrene, rosin ester, styrenated terpenes, polyterpenes, terpene phenolics and mixtures thereof, said SBCs having a molecular weight (Mn) above 100,000 g/mol and said miscible polymers having a molecular weight (Mn) less than 10,000 g/mol.

15. The composition according to any one of claims 2 and 5 to 14 or the method according to any one of claims 4 to 14, wherein the crosslinking agent is selected from the group consisting of multifunctional acrylates, such as trimethylolpropane triacrylate (TMPTA), trimethylolpropane trimethacrylate (TMPTMA), epoxy acrylates, urethane acrylates, triallyl-cyanurate, triallyl-isocyanurate, functional thiols, such as 1 ,8-dimercapto-3,6-dioxaoctane, trimethylolpropane-tris-3 mercaptopropionate, pentaerythritol tetrakis-3-mercaptopropionate, ethoxylated trimethylolpropane tri(3-mercaptopropionate), as well as other multifunctional compounds with vinyl or allyl groups, and mixtures thereof.

16. The composition according to any one of claims 2 and 5 to 14 or the method according to any one of claims 4 to 14, wherein the crosslinking agent is a metal salt, an amine cross-linker selected from the group consisting of organic amine, organic diamine and organic polyamine or a polyol.

17. The composition according to any one of claims 2 and 5 to 14 or the method according to any one of claims 4 to 14, wherein the crosslinking agent is selected from conventional sulphur, metallic oxides and accelerators commonly utilized for vulcanization of rubber.

18. The composition or according to any one of claims 2 or 5 to 14 or the method according to any one of claims 4 to 14 wherein the cross-linker is selected from, di-thiol, tri-thiol and tetra-thiol molecules containing ether or ester groups in their backbone.

19. The method according to any one of claims 5 to 18, wherein the composition is cross-linked by the application of radiation, for example UV, electron beam, gamma or X-Ray radiation.

20. The method according to any one of claims 5 to 19, wherein the crosslinking reaction is initiated or enhanced by one or a mixture of radical-type photo-initiators.

21. The method according claim 20, wherein the crosslinking photo-initiators are selected from the group consisting of acylphosphine oxides, for example monoacylphosphine oxides, bisacylphosphine oxides, 2,4,6-trimethylbezoyldiphenylphosphine oxide or others such as 2-hydroxy-methyl-1-phenylpropanone, methylbenzoylformate, and phenylglyoxylic acid methyl ester.

22. The composition according to any one of claims 5 to 18, the blend according to any one of claims 3 to 14, or the method according to any one of claims 5 to 21 , wherein the plasticizer comprises a liquid or a mixture of liquid saturated polyolefins compatible with the midblock (elastomeric block) of the SBC.

23. The composition according to any one of claims 5 to 18 or 22, the blend according to any one of claims 3 to 14 or 22, or the method according to any one of claims 5 to 22, wherein the plasticizer comprises plasticizing oils, preferably mineral plasticizing oils and especially mineral oils formed from a purified mixture of liquid saturated hydrocarbons formed from compounds of paraffinic or naphthenic nature or mixtures thereof.

24. The composition according to any one of claims 5 to 18, 22 or 23, the blend according to any one of claims 3 to 14, 22 or 23, or the method according to any one of claims 5 to 23, wherein the flexibilizer is selected from polybutadiene, polyisoprene, polyisobutene, amorphous polyolefin copolymers of

propylene and ethylene, butyl rubber and other elastomers known to have a sufficient compatibility with the elastomeric block.

25. The composition according to any one of claims 1 , 2, 5 to 18 or 22 to 24, the blend according to any one of claims 3 to 14 or 22 to 24, or the method according to any one of claims 4 to 24, further comprising other adjuvants conventionally used in the polymer industry and specifically in the glove industry, such as, for example, lubricants, anti-static agents, primary and secondary antioxidants, colorants, or processing agents.

26. A method for producing an immersion article from at least one SBC composition according to any one of claims 1 , 2, 5 to 18, or 22 to 25, or the blend according to any one of claims 3 to 14 or 22 to 25, in which a mold with an external contour which corresponds to that of the immersion article to be produced is immersed for a pre-specifiable period of time in an immersion solution comprising the one or more SBC compositions or miscible polymer blends, and where subsequently the immersion article is removed from the solution and dried.

27. The method according to claim 26 further comprising exposing the dried article to radiation, preferably electron beam radiation.

28. A thin film comprising one or more SBC compositions or miscible polymer blends wherein said thin film has a tensile strength of greater than 17 MPa when evaluated according to ASTM 3577 and wherein said thin film is substantially insoluble in an organic solvent.

29. The thin film according to claim 28, wherein the film has a thickness between about 10 microns and about 500 microns.

30. The thin film according to claim 28 or 29, wherein at least 80% of the thin film is insoluble, or at least 95% of the film is insoluble in an organic solvent.

31. A thin film comprising one or more SBC compositions according to any one of claims 1 , 2, 5 to 18 or 22 to 24, or miscible polymer blends according to any one of claims 3 to 14 or 22 to 24.

32. The thin film according to claim 31 , wherein the film has a thickness between about 10 microns and about 500 microns.

33. The thin film according to claim 31 , wherein the film has a thickness between about 150 microns and about 250 microns.

34. The thin film according to any one of claims 30 to 33, wherein the thin film has a tensile strength of greater than 17 MPa when evaluated according to ASTM 3577 and wherein the thin film is substantially insoluble in an organic solvent.

35. A multilayer film, said multilayer film comprising one or more layers, said one or more layers comprising SBC compositions according to any one of claims 1 , 2, 5 to 18 or 22 to 25, or miscible polymer blends according to any one of claims 3 to 14 or 22 to 25.

36. A multilayer film, said multilayer film comprising one or more layers, said one or more layers comprising SBC compositions or miscible polymer blends wherein said composition or miscible polymer blend has a tensile strength of at least 17 MPa and wherein said composition or miscible polymer blend is substantially insoluble in an organic solvent.

37. A multilayer film, said multilayer film comprising several thin films according to any one of claims 28 to 34.

38. The multilayer film according to any one of claims 35 to 37, wherein at least one layer is selected from the group consisting of natural rubber, polybutadiene, polyisoprene, polychloroprene, butyl rubber, polyurethane, acrylic polymers and copolymers, silicone elastomers, other SBCs, cyclic block copolymers (CBC) and blends therefrom.

39. An article of manufacture comprising one or more of the SBC compositions according to any one of claims 1 , 2, 5 to 18 or 22 to 25, or miscible polymer blends according to any one of claims 3 to 14 or 22 to 25.

40. The article of manufacture according to claim 39, wherein the article is a medical device, such as medical glove, a condom, or personal protective equipment, such as laboratory gloves or clean industry gloves.