Cross linkage of pressure-sensitive adhesive substances by means of electron beams
View Patent ↗A process for crosslinking a coating of pressure-sensitive adhesive systems on a backing material, characterized in that the pressure-sensitive adhesive system present on the backing material is irradiated with accelerated electrons by means of an irradiation means, the backing material coated with the pressure-sensitive adhesive system to be irradiated runs via a roller, there is a contact medium between the roller and the backing material during irradiation.
1. A process for producing an adhesive tape, said process comprising the following steps:
a) providing an adhesive tape comprising a backing coated on a first face thereof with a pressure-sensitive adhesive;
b) crosslinking the pressure-sensitive adhesive by irradiating the adhesive tape while the adhesive tape runs over a roller;
wherein a second face of the backing is between the first face and the roller, and a contact medium is between the roller and the second face.
2. The process of claim 1 , wherein the roller is thermally contained.
3. The process according to claim 2 , wherein the roller is thermally contained at a temperature in a range from about −10° C. to about 200° C.
4. The process according to claim 3 , wherein the roller is thermally contained at a temperature in a range from about 5° C. to about 150° C.
5. The process of claim 1 , wherein the contact medium does not remain permanently on the roller but instead is applied to the roller before the irradiating and removed from the roller again after the irradiating.
6. The process of claim 1 , wherein the contact medium is introduced into the process with the backing.
7. The process of claim 1 , wherein the contact medium is a liquid.
8. The process according to claim 7 , wherein the liquid is water.
9. The process according to claim 7 , wherein the liquid is water admixed with one or more soluble or partly soluble additives.
10. The process of claim 1 , wherein the contact medium comprises one or more additives selected from the group consisting of alkyl alcohols, glycols, ketones, amines, carboxylates, water-soluble cellulose derivatives, sulfonates and surfactants.
11. The process of claim 1 , wherein the backing coated with the pressure-sensitive adhesive runs over the roller under applied pressure.
12. The process of claim 1 , wherein a surface of the roller is electrically conductive or semiconducting.
13. The process of claim 1 , wherein the contact medium and/or the roller and/or a surface of the roller are grounded.
14. The process of claim 1 , wherein the roller possesses a surface texture.
15. The process according to claim 14 , wherein the surface is roughened.
16. The process of claim 1 , wherein the roller is a steel roller.
17. The process according to claim 16 , wherein the roller carries a corrosion resistance and/or wettability improving agent.
18. The process of claim 1 , wherein the contact medium is applied to the roller by means of a fluid applicator.
19. The process of claim 18 , wherein the fluid applicator is thermally conditionable.