Fine-particle, stable suspensions of functionalized, completely or partially hydrogenated nitrile rubbers
View Patent ↗Novel stable aqueous suspensions of a functionalized, completely or partially hydrogenated nitrile rubber are provided with very low emulsifier content and small particle diameter, furtheron a process for production thereof and the use thereof for producing composite materials via coating of substrate materials with the suspension.
1. An aqueous suspension of a carboxylated, completely or partially hydrogenated nitrite rubber with an emulsifier content of less than 1 part by weight, based on 100 parts by weight of the carboxylated, completely or partially hydrogenated nitrile rubber, wherein the average particle diameter of the carboxylated, completely or partially hydrogenated nitrite rubber in the suspension is in the range from 0.01 to 0.9 micrometer, measured by means of dynamic light scattering.
2. The aqueous suspension according to claim 1 , wherein the average particle diameter of the carboxylated, completely or partially hydrogenated nitrile rubber in the suspension is in the range from 0.05 to 0.8 micrometer; measured by means of dynamic light scattering.
3. The aqueous suspension according to claim 1 , wherein the particle diameter d 50 , determined via laser diffraction (intensity-weighted) is in the range from 0.01 micrometer to 0.9 micrometer.
4. The aqueous suspension according to claim 1 , in which the solids concentration of the carboxylated, completely or partially hydrogenated nitrile rubber is from 5% to 65% by weight.
5. The aqueous suspension according to claim 1 , comprising less than 0.5 parts by weight, of emulsifier, based on 100 parts by weight of the carboxylated, completely or partially hydrogenated nitrile rubber.
6. The aqueous suspension according to claim 1 , comprising less than 0.09 parts by weight, of emulsifier, based on 100 parts by weight of the carboxylated, completely or partially hydrogenated nitrile rubber.
7. The aqueous suspension according to claim 1 comprising a carboxylated, completely or partially hydrogenated nitrile rubber which has repeating units derived from at least one conjugated diene, from at least one α,β-unsaturated nitrile and from at least one further carboxylated, copolymerizable monomer, where this monomer either has at least one carboxy group in the monomer molecule or reacts in situ with release of at least one carboxy group, wherein at least 50% of the C═C double bonds of the diene monomer incorporated into the polymer have been hydrogenated.
8. A process for the coating of a substrate material comprising bringing the aqueous suspension according to claim 1 into contact with the substrate material.
9. The process according to claim 8 , wherein the substrate material is selected from the group consisting of plastics, metals and fibres.
10. The process according to claim 8 , wherein the substrate material is selected from the group consisting of glass fibres, metal fibres, and synthetic organic fibres.
11. The process according to claim 8 , wherein the suspension is used in the form of a binder composition which also comprises a mixture comprising resin and/or hardener and optionally one or more other rubber additives.
12. A binder composition comprising
a) a suspension according to claims 1 , and
b) a mixture comprising resin and/or hardener,
c) optionally one or more other rubber additives, preferably crosslinking agents, crosslinking accelerators and fillers, in particular carbon black or mineral filler.
13. The binder composition according to claim 12 . comprising a mixture b) containing a resin selected from the group consisting of resorcinol/formaldehyde, resorcinol/chlorophenol/formaldehyde, isocyanates, capped isocyanates, urea derivatives and mixtures thereof.
14. A coated substrate material obtainable by the process according to claim 8 .
15. A process for producing composite materials, wherein the coated substrate material according to claim 14 is embedded and vulcanized into a mixture of one or more other rubbers and auxiliaries.
16. The process according to claim 15 , wherein the rubbers have been selected from the group consisting of one or more NR, BR, SBR, EPM, EPDM, ECO, EVM, CSM, ACM, VMC, FKM, NBR, HNBR and any mixtures thereof and the auxiliaries are selected from the mixture consisting of one or more fillers, crosslinking agents, crosslinking accelerators and mixtures thereof.
17. A composite material obtainable by the process according to claim 15 .