Aqueous compositions based on polychloroprene

1. A composition comprising:

a) polychloroprene particles,

b) zinc oxide particles whose average particle size is less than 150 nm (weight average determined by ultracentrifuge) and

c) water.

2. The composition according to claim 1 , wherein the polychloroprene particles have an average primary particle diameter of less than 220 nm (weight average determined by ultracentrifuge).

3. The composition according to claim 1 further comprising

d1) silicon dioxide particles and/or

d2) at least one anti-ageing agent which is different from component b).

4. The composition according to claim 3 containing silicon dioxide particles having an average particle diameter in the range from 1 to 400 nm (weight average determined by ultracentrifuge).

5. The composition according to claim 3 which has been obtained using a water-containing silica sol.

6. The composition according to claim 1 , wherein zinc oxide particles are present in the form of zinc oxide particle agglomerates.

7. The composition according to claim 1 , wherein the average primary particle size of the zinc oxide particles is less than 100 nm (weight average determined by ultracentrifuge).

8. The composition according to claim 1 which has been obtained using a water-containing zinc oxide sol.

9. The composition according to claim 1 which contains zinc oxide particles having an average primary particle size of less than 30 nm (weight average determined by ultracentrifuge).

10. The composition according to claim 1 which also contains at least one surface-active agent.

11. The composition according to claim 1 which contains:

20 to 99.99% by weight of polychloroprene particles,

0.01 to 10% by weight of zinc oxide particles,

0 to 40% by weight of silicon dioxide particles,

0 to 10% by weight of at least one anti-ageing agent which is different from zinc oxide,

0 to 79.99% by weight of other conventional adhesive auxiliaries and additives and

water,

wherein the percentages by weight relate to the solids content of the composition, which adds up to 100%.

12. The composition according to claim 11 which contains more than 50% by weight of polychloroprene particles.

13. An adhesive composition including zinc oxide particles having an average particle size of less than 100 nm (weight average determined by ultracentrifuge), as an anti-ageing agent.

14. A method of producing an adhesive composition comprising combining zinc oxide particles having an average particle size is less than 100 nm (weight average determined by ultracentrifuge) with a polychloroprene-containing adhesive composition.

15. A process for producing the composition according to claim 1 comprising mixing a water-containing polychloroprene dispersion with a water-containing zinc oxide dispersion and optionally a water-containing silicon dioxide dispersion and optionally conventional adhesive auxiliaries selected from the group consisting of polyacrylates, polyvinylidene chloride, polybutadiene, polyvinyl acetate, styrene/butadiene rubbers, fillers, wetting agents, thickeners, fungicides, tackifying resins, plasticizers, solvents, and combinations thereof.

16. A method of bonding substrates comprising applying the composition according to claim 1 to a surface of at least one substrate and contacting that surface with a surface of another substrate.

17. A process for producing bonded substrates which comprises applying at least one composition according to claim 1 to at least one surface of at least one substrate and subsequently bonding the coated substrate with at least one additional, optionally coated substrate.

18. Bonded substrates obtained according to claim 17 .

19. The composition according to claim 2 further comprising

d1) silicon dioxide particles and/or

d2) at least one anti-ageing agent which is different from component b).

20. The composition according to claim 4 which has been obtained using a water-containing silica sol.