Aqueous resin dispersion, process of making thereof, and product thereof
View Patent ↗The invention relates to watery resin dispersions, a process for their manufacture, and a product. To make available resin dispersions that do not pollute the environment during their processing, while simultaneously generating products that have a high glass transition temperature, it is suggested that the watery resin dispersion contain at least components (I), (II) and (III), whereby R 1 : unsubstituted single or polynuclear aromatic rest or with amino groups and/or cyano groups and/or nitrile groups and/or with saturated and/or unsaturated aliphatic C 2 to C 12 carbon chains substituted single or polynuclear aromatic rests R 2 , R 3 and R 4 : hydrogen, alkyl residue group with up to 15 C atoms or aromatic rest whereby R 2 , R 3 and R 4 can be equal to or different from each other, (II) is a co-dispersion agent based on epoxide resins and/or novolak resins and (II) one surfactant.
1. An aqueous resin dispersion comprising constituents (I) to (IV):
where
R 1 is a mono- or polynuclear aromatic radical unsubstituted or substituted with amino groups and/or cyano groups and/or nitrile groups and/or with saturated and/or unsaturated aliphatic C 2 to C 12 carbon chains; and
R 2 , R 3 and R 4 : hydrogen, alkyl radicals having up to 15 carbon atoms or an aromatic radical, wherein R 2 , R 3 and R 4 may be the same or different from one another,
(II) a codispersant based on epoxy resins, novolak resins, or their combinations,
(III) a nonionic surfactant selected from castor oil ethoxylate, a hydrogenated castor oil ethoxylate, alkylphenol ethoxylate, fatty alcohol ethoxylate, oleic acid ethoxylate, oxo process alcohol ethoxylate or fatty alcohol alkoxylate, and
(IV) a stabilizer based on cellulose derivatives, starch, dextrin, polyacrylic acid or copolymeric salts thereof, poly-N-vinylmethyl acetamide, polyvinyl alcohol, vinyl pyrrolidone copolymers or Stimme protective colloids.
2. The resin dispersion of claim 1 , wherein R 1 of said constituent (I) is an unsubstituted phenyl radical.
3. The resin dispersion of claim 1 wherein R 2 , R 3 and R 4 of said constituent (I) are alkyl radicals having 8 to 15 carbon atoms.
4. The resin dispersion of claim 1 wherein said constituent (I) is a reaction product of bisphenol A, aniline and formaldehyde.
5. The resin dispersion of claim 1 wherein the codispersant is a low molecular weight epoxy resin having an average molar mass of 200 to 1000.
6. The resin dispersion of claim 1 wherein the novolak resin is a phenol-formaldehyde resin prepared using a phenol:formaldehyde ratio in the range from 1:0.4 to 1:0.8.
7. The resin dispersion of claim 1 wherein the codispersant is in the range from 30% to 60% by weight, based on the amount of said constituent (I) used.
8. The resin dispersion of claim 1 wherein the surfactant is present in an amount in the range from 3% to 20% by weight based on the amount of said constituent (I) used.
9. The resin dispersion of claim 1 wherein the stabilizer is methoxy cellulose.
10. The resin dispersion of claim 1 wherein the stabilizer is present at a concentration of 0.2% to 2% by weight, based on the mass of the overall mixture.
11. A process for producing the aqueous resin dispersion of claim 1 comprising: mixing the codispersant and the surfactant with said constituent (I) which is essentially in the melt.
12. The process of claim 11 further comprising:
a) adding at least the codispersant to said constituent (I), and
b) adding at least a surfactant and water or a mixture of at least a surfactant and water to the mixture obtained in step a).
13. The process of claim 12 further comprising adding the stabilizer in step b).
14. A product having a crosslinked or uncrosslinked surface layer produced by applying the aqueous resin of claim 1 .