Polar-modified rice husk wax
The invention provides polar-modified rice husk waxes obtainable by free-radical grafting of unmodified rice husk waxes with graft comonomers selected from the group of the α,β-unsaturated mono- or polybasic carboxylic acids or derivatives thereof. The invention further provides derivatization products prepared by chemical conversion of the polar-modified rice husk waxes of the invention. The invention further provides processes for producing the products of the invention and for the use thereof.
1. A polar-modified rice husk wax obtained by free-radical grafting of unmodified rice husk wax with one or more graft comonomers selected from the group consisting of α,β-unsaturated mono- or polybasic carboxylic acids and derivatives thereof selected from the group consisting of esters, amides and anhydrides, wherein the polar-modified rice husk wax has an acid number of 2 to 120 mg KOH/g, a melt viscosity measured at 90° C. of 20 to 500 mPa·s and a dropping point of 40 to 90° C.
2. The polar-modified rice husk wax as claimed in claim 1 , wherein the graft comonomer is maleic anhydride.
3. A process for producing the polar-modified rice husk wax as claimed in claim 1 , comprising reacting refined rice husk wax with an α,β-unsaturated mono- or polybasic carboxylic acid or with a derivative thereof selected from the group consisting of an ester, an amide and an anhydride in the presence of a free-radical initiator to form the polar-modified rice husk wax.
4. A product obtained from the polar-modified rice husk wax as claimed in claim 1 , where the polar-modified rice husk is subjected to one or more of hydrolysis, alcoholysis, esterification, amidation, hydrolysis, ethoxylation, anhydride formation and decarboxylation.
5. A hydrolysis product formed by hydrolysis of the polar-modified rice husk wax as claimed in claim 1 , wherein the hydrolysis is effected with metal oxides, metal hydroxides or metal carbonates.
6. An aqueous dispersion comprising the polar-modified rice husk wax as claimed in claim 1 .
7. A solvent-based dispersion comprising the polar-modified rice husk wax as claimed in claim 1 .
8. A lubricant additive in plastics comprising the polar-modified rice husk wax as claimed in claim 1 .
9. A dispersant for pigment masterbatch formulation for coloring of plastics comprising the polar-modified rice husk wax as claimed in claim 1 .
10. An adhesion promoter in composite materials composed of plastics and wood or plastics and glass fibers comprising the polar-modified rice husk wax as claimed in claim 1 .
11. A compatibilizer in blends of different plastics comprising the polar-modified rice husk wax as claimed in claim 1 .
12. A hotmelt adhesive comprising the polar-modified rice husk wax as claimed in claim 1 .
13. A solvent-containing paste comprising the polar-modified rice husk wax as claimed in claim 1 .
14. An aqueous dispersion comprising a derivatization product of the polar-modified rice husk wax as claimed in claim 1 .
15. A solvent-based dispersion comprising a derivatization product of the polar-modified rice husk wax as claimed in claim 1 .
16. A lubricant additive in plastics comprising a derivatization product of the polar-modified rice husk wax as claimed in claim 1 .
17. A dispersant for pigment masterbatch formulation for coloring of plastics comprising a derivatization product of the polar-modified rice husk wax as claimed in claim 1 .
18. An adhesion promoter in composite materials composed of plastics and wood or plastics and glass fibers comprising a derivatization product of the polar-modified rice husk wax as claimed in claim 1 .
19. A hotmelt adhesive comprising a derivatization product of the polar-modified rice husk wax as claimed in claim 1 .
20. A solvent-containing paste comprising a derivatization product of the polar-modified rice husk wax as claimed in claim 1 .