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US 6,281,236 B1Granted
Oil-in-water emulsion with improved stability
AssigneeAlwyn Company, Inc.
InventorElliott Farber
Life of this patent
Estimating the term…
Abstract
A skin cream composition containing allantoin and an emulsifier has improved stability coming from the adjustment of the pH to a range of 4.5 to 5.8. The lower pH preserves the stability of the allantoin and the functionality of the emulsifier system is maintained. The emulsifier system can be a nonionic emulsifier or an anionic emulsifier plus beeswax. The acid used to adjust the pH can be an organic acid or an inorganic acid. The composition can further comprise other ingredients such as herbal extracts, chelating agents, preservatives, emollients, solvents, and fragrance.
Claims48
A composition consisting essentially of an oil-in-water emulsion comprising:
- (a) allantoin;
- and
- (b) an emulsifier system including beeswax and an anionic emulsifier that is hydrophilic and is soluble in water;
- and
- (c) an acid to adjust the pH of the emulsion to a value from about 4.5 to about 5.8, the allantoin being stable in the emulsion for at least 90 days at 40° C.
2 more elements
A composition comprising an oil-in-water emulsion comprising:
- (a) allantoin;
- (b) an emulsifier system including beeswax and an anionic emulsifier that is hydrophilic and is soluble in water;
- and
- (c) an acid to adjust the pH of the emulsion to a value from about 4.5 to about 5.8, the allantoin being stable in the emulsion for at least 90 days at 40° C.,
- wherein the anionic emulsifier is selected from the group consisting of ammonium lauryl sulfate, sodium lauryl sulfate, sodium laureth sulfate, sodium oleyl succinate, ammonium lauryl sulfosuccinate, sodium dodecylbenzene sulfate, ammonium laureth sulfate, and sodium lauryl sarcosinate.
2 more elements
A composition comprising an oil-in-water emulsion comprising:
- (a) allantoin;
- (b) an emollient component comprising:
- (i) lanolin oil;
- (ii) cetyl alcohol;
- (iii) stearyl alcohol;
- (iv) cod liver oil;
- and
- (v) butylated hydroxytoluene;
- (c) an emulsifier system comprising at least one nonionic emulsifier that is an ethoxylated ether or an ethoxylated ester whose carbon chain length ranges from 8 to 22 carbon atoms and at least one anionic emulsifier;
- and
- (d) at least one acid selected from the group consisting of:
- (i) an organic acid of from 2 to 22 carbon atoms;
- and
- (ii) an inorganic acid selected from the group consisting of hydrochloric acid, sulfuric acid, and phosphoric acid to adjust the pH to from about 4.5 to about 5.8, the allantoin being stable in the emulsion for at least 90 days at 40° C.
11 more elements
A composition comprising an oil-in-water emulsion comprising:
- (a) allantoin;
- and
- (b) an emulsifier system including at least one nonionic emulsifier that is an ethoxylated ether or an ethoxylated ester whose carbon chain length ranges from 8 to 22 carbon atoms and at least one anionic emulsifier;
- and
- (c) an acid to adjust the pH of the emulsion to a value from about 4.5 to about 5.8, the allantoin being stable in the emulsion for at least 90 days at 40° C.
2 more elements
The composition of claim 35 wherein the chelating agent is tetrasodium EDTA.
A composition comprising an oil-in-water emulsion comprising:
- (a) water;
- (b) sodium lauryl sulfate;
- (c) propylene glycol;
- (d) tetrasodium EDTA;
- (e) citric acid;
- (f) lanolin oil;
- (g) cetyl alcohol;
- (h) stearyl alcohol;
- (i) beeswax;
- (j) cod liver oil;
- (k) butylated hydroxytoluene;
- (l) St. John's wort extract;
- (m) witch hazel extract;
- (n) chamomile extract;
- (o) arnica extract;
- (p) methylparaben;
- (q) propylparaben;
- (r) allantoin;
- and
- (s) fragrance;
- where the pH of the composition is from about 4.5 to about 5.8, the allantoin being stable in the emulsion for at least 90 days at 40° C.
18 more elements
A composition comprising an oil-in-water emulsion comprising:
- (a) from about 50% to about 90% of water;
- (b) from about 0.5% to about 2.5% of 30% sodium lauryl sulfate;
- (c) from about 2.0% to about 9.0% of propylene glycol;
- (d) from about 0.05% to about 0.50% of tetrasodium EDTA;
- (e) from about 0.05% to about 0.5% of citric acid;
- (f) from about 5% to about 15% of lanolin oil;
- (g) from about 3% to about 10% of cetyl alcohol;
- (h) from about 1% to about 5% of stearyl alcohol;
- (i) from about 0.5% to about 2.5% of beeswax;
- (j) from about 1.0% to about 7.0% of cod liver oil;
- (k) from about 0.1% to about 1.0% of butylated hydroxytoluene;
- (l) from about 0.05% to about 0.50% of St. John's wort extract;
- (m) from about 0.05% to about 0.50% of witch hazel extract;
- (n) from about 0.05% to about 0.50% of chamomile extract;
- (o) from about 0.05% to about 0.5% of arnica extract;
- (p) from about 0.1% to about 0.5% of methylparaben;
- (q) from about 0.1% to about 0.5% of propylparaben;
- (r) from about 0.50% to about 2% of allantoin;
- and
- (s) from about 0.05% to about 0.50% of fragrance;
- the pH of the composition being from about 4.5 to about 5.8, the allantoin being stable in the emulsion for at least 90 days at 40° C.
18 more elements
A composition comprising an oil-in-water emulsion comprising:
- (a) from about 55% to about 75% of water;
- (b) from about 1.0% to about 2.5% of 30% sodium lauryl sulfate;
- (c) from about 3.0% to about 6.0% of propylene glycol;
- (d) from about 0.1% to about 0.3% of tetrasodium EDTA;
- (e) from about 0.08% to about 0.35% of citric acid;
- (f) from about 8.0% to about 12.0% of lanolin oil;
- (g) from about 3.5% to about 7.5% of cetyl alcohol;
- (h) from about 1.0% to about 3.0% of stearyl alcohol;
- (i) from about 1.0% to about 2.5% of beeswax;
- (j) from about 1.0% to about 4.0% of cod liver oil;
- (k) from about 0.2% to about 0.8% of butylated hydroxytoluene;
- (l) from about 0.05% to about 0.15% of St. John's wort extract;
- (m) from about 0.05% to about 0.15% of witch hazel extract;
- (n) from about 0.05% to about 0.15% of chamomile extract;
- (o) from about 0.05% to about 0.15% of arnica extract;
- (p) from about 0.15% to about 0.40% of methylparaben;
- (q) from about 0.10% to about 0.30% of propylparaben;
- (r) from about 0.50% to about 2.0% of allantoin;
- and
- (s) from about 0.1% to about 0.3% of fragrance;
- the composition having a pH of from about 4.5 to about 5.8, the allantoin being stable in the emulsion for at least 90 days at 40° C.
18 more elements
A composition comprising an oil-in-water emulsion comprising:
- (a) about 68.68% of water;
- (b) about 1.9% of 30% sodium lauryl sulfate;
- (c) about 5.3% of propylene glycol;
- (d) about 0.15% of tetrasodium EDTA;
- (e) about 0.12% of citric acid;
- (f) about 10.6% of lanolin oil;
- (g) about 4.2% of cetyl alcohol;
- (h) about 2.0% of stearyl alcohol;
- (i) about 1.90% of beeswax;
- (j) about 2.0% of cod liver oil;
- (k) about 0.5% of butylated hydroxytoluene;
- (l) about 0.1% of St. John's wort extract;
- (m) about 0.1% of witch hazel extract;
- (n) about 0.1% of chamomile extract;
- (o) about 0.1% of arnica extract;
- (p) about 0.3% of methylparaben;
- (q) about 0.25% of propylparaben;
- (r) about 1.50% of allantoin;
- and
- (s) about 0.20% of fragrance;
- the composition having a pH of from about 4.5 to about 5.8, the allantoin being stable in the emulsion for at least 90 days at 40° C.
18 more elements
A composition comprising an oil-in-water emulsion comprising:
- (a) from about 1.0% to about 2.0% of allantoin;
- and
- (b) an emulsifier system including beeswax and an anionic emulsifier that is hydrophilic and is soluble in water, the pH of the emulsion being from about 4.5 to about 5.8 after the addition of acid to bring the pH into the range of from about 4.5 to about 5.8, the allantoin being stable in the emulsion for at least 90 days at 40° C.
A composition comprising an oil-in-water emulsion comprising:
- (a) from about 1.0% to about 2.0% of allantoin;
- (b) an emollient component comprising:
- (i) lanolin oil;
- (ii) cetyl alcohol;
- (iii) stearyl alcohol;
- (iv) cod liver oil;
- and
- (v) butylated hydroxytoluene;
- (c) an emulsifier system comprising at least one nonionic emulsifier that is an ethoxylated ether or an ethoxylated ester whose carbon chain length ranges from 8 to 22 carbon atoms;
- and
- (d) at least one acid selected from the group consisting of:
- (i) an organic acid of from 2 to 22 carbon atoms;
- and
- (ii) an inorganic acid selected from the group consisting of hydrochloric acid, sulfuric acid, and phosphoric acid to adjust the pH to from about 4.5 to about 5.8, the allantoin being stable in the emulsion for at least 90 days at 40° C.
11 more elements
A composition comprising an oil-in-water emulsion comprising:
- (a) from about 1.0% to about 2.0% of allantoin;
- (b) an emulsifier system including at least one nonionic emulsifier that is an ethoxylated ether or an ethoxylated ester whose carbon chain length ranges from 8 to 22 carbon atoms;
- and
- (c) an acid to adjust the pH of the emulsion to a value from about 4.5 to about 5.8, the allantoin being stable in the emulsion for at least 90 days at 40° C.
1 more element
Dependencies are inferred from the claim text.