Oil in water wax emulsion composition
The present invention relates to compositions in the form of an oil-in-water emulsion preferably comprising an aqueous phase, a natural wax, at least two surfactants, and a neutralizing agent.
1. An oil-in-water emulsion composition comprising a solids portion and an aqueous phase, wherein the aqueous phase comprises an emulsifying package, and a neutralizing agent, and wherein the solids portion comprises a wax, wherein the wax is 20-60% by weight of the oil-in-water emulsion, and is a naturally derived, renewable resource, and has a melting point between 49-100° C. and a saponification value of above 20 mg KOH/g, and wherein the emulsifying package comprises polyethylene glycol (PEG) of molecular weight 150-500.
2. The composition of claim 1 wherein the wax is rice bran wax.
3. The composition of claim 1 wherein the emulsifying package further comprises at least two nonionic surfactants.
4. The composition of claim 3 wherein one of the at least two surfactants is an alcohol ether of ethylene oxide propylene oxide surfactant which contains saturated C8-C10 carbon chains with moles of ethoxylated and propoxylated chains.
5. The composition of claim 1 wherein the wax is derived from free fatty acids and alcohols and the neutralizing agent is any agent to neutralize the free fatty acids and alcohols.
6. The composition of claim 5 wherein the neutralizing agent comprises a base which includes potassium hydroxide, sodium hydroxide, and/or amines such as ammonia, ethyl amines, ethanolamine, isopropylamines, and other amine derivatives in a weight amount of 0.25-5% of the oil-in-water emulsion.
7. The composition of claim 1 wherein the emulsifying package further comprises an alcohol ether and a secondary alcohol ethoxylate, the secondary alcohol ethoxylate containing a secondary chain whose length is approximately 41 moles of ethylene oxide.
8. A method of preparing an oil-in-water emulsion composition of claim 1 , the method comprising the following steps:
(a) mixing the aqueous phase comprising the emulsifying package and the neutralizing agent;
(b) heating the mixture of step (a) to above a melting point of the wax of step (c);
(c) blending the heated mixture of step (b) with the wax to form a new mixture;
(d) maintaining the temperature of the mixture of step (c) until the mixture is fully blended and is dispersed as a blended aqueous mixture.
9. The method of claim 8 , further comprising a step after step (d) of:
(e) homogenizing the blended aqueous mixture of step (d).
10. The method of claim 8 wherein the emulsifying package comprises an alcohol ether, polyethylene glycol (PEG), and a secondary alcohol ethoxylate.
11. The method of claim 10 wherein the alcohol ether is an alcohol ether of ethylene oxide propylene oxide surfactant.
12. The method of claim 10 wherein the secondary alcohol ethoxylate contains a secondary chain whose length is approximately 30-60 moles of ethylene oxide.
13. The method of claim 8 wherein the aqueous phase is a continuous aqueous phase that is opaque.
14. The method of claim 8 wherein the wax is derived from free fatty acids and alcohols and the neutralizing agent is any agent to neutralize the free fatty acids and alcohols.
15. The method of claim 14 wherein the neutralizing agent is comprised of ammonium hydroxide in a weight amount of 0.1-10% of the oil-in-water emulsion.