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1. WO2020200857 - PROCÉDÉ DE MODIFICATION DE LA POLARITÉ DE SURFACE DE SUBSTRATS EN CAOUTCHOUC

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims

1. Process for modifying the surface of an elastomeric rubber substrate, wherein the process comprises

(a) applying a first and a second composition to the elastomeric rubber substrate surface, wherein the first composition is an aqueous composition comprising chloride (Cl ), preferably sodium chloride, and the second composition is an aqueous composition comprising peroxymonosulfate (HSO5 /SO52 ), preferably an alkali metal

peroxymonosulfate, more preferably potassium peroxymonosulfate (KHSO5);

(b) optionally applying a third composition comprising activated carbon; and

(c) incubating the first, second and optionally third composition with the rubber substrate for a time period and under conditions that allow chlorination of the elastomeric rubber surface.

2. The process according to claim 1 , wherein the first composition is an aqueous solution of sodium chloride, preferably with a concentration of 1 M to 6M sodium chloride, more preferably 4M to 6M.

3. The process according to claim 1 or 2, wherein the second composition is an aqueous

solution of a persulfate, preferably of potassium monopersulfate, preferably with a concentration of 10M to 30M persulfate, more preferably 18to 22M.

4. The process according to any one of claims 1 to 3, wherein the first and second composition are used in a weight ratio of about 3:1 to 1 :3, preferably about 2:1 to 1 :2, more preferably about 1 ,5:1 to 1 :1 ,5.

5. The process according to any one of claims 1 to 4, wherein the amount of the first and/or second and/or third composition applied to the elastomeric rubber substrate surface ranges from 500 to 900 g/m2, preferably 600 to 700 g/m2.

6. The process according to any one of claims 1 to 5, wherein step (c) is carried out for 5 to 60 minutes, preferably 15 to 30 minutes.

7. The process according to any one of claims 1 to 6, wherein the process further comprises the step of cleaning the substrate surface after step (c).

8. The process according to any one of claims 1 to 7, wherein the first composition contains additionally a hydroxide, preferably sodium and/or potassium hydroxide.

9. The process according to claim 8, wherein the first composition contains the hydroxide in a concentration of 0.5 M (mol/L) to 3 M (based on OH- ions).

10. Elastomeric rubber substrate having a chlorinated surface area obtainable according to the process of any one of claims 1 to 9.

11. Process for forming a bond between a first and a second substrate, wherein the first

substrate is an elastomeric rubber substrate according to claim 8 or obtained according to the process of any one of claims 1 to 9 and the second substrate is a rubber or metal substrate, wherein the process comprises:

(a) applying an adhesive composition to the to-be-bonded surface of the rubber or metal substrate, wherein the adhesive composition preferably is a 2K epoxy, polyurea, silicone or polyurethane adhesive comprising a resin formulation and a hardener formulation;

(b) contacting the chlorinated surface of the rubber substrate and the surface of the metal substrate with the applied adhesive under pressure to form the bond.

12. Process according to claim 11 , wherein the process further comprises a step of cleaning the rubber and/or metal substrate surfaces prior to steps (a) and/or (b).

13. Process according to any one of claims 11 to 12, wherein step (b) is carried out at a

temperature of 15 to 30°C and a relative humidity of 85% or less.

14. Process according to any one of claims 11 to 13, wherein step (b) is carried out by rolling.

15. Bonded product obtainable according to the process of any one of claims 9-13.