Concentrated, aqueous solutions of p-methoxybenzoic acid for use in cosmetic and dermatologic formulations

1. A liquid, composition comprising:

a) 5-15 weight % p-methoxybenzoic acid, or salt thereof:

b) 5-60 weight % of water; and

at least one of c) and/or d):

c) 20-55 weight % one or more of an organic acid and/or their salts;

d) 20-60 weight % one or more of a polyol, an ester of polyglycerol and an ester of sorbitan; said composition having a pH of 7.0-8.0.

2. The composition of claim 1 comprising:

a) 5 weight % to 10 weight % sodium salts of p-methoxybenzoic acid;

b) 5 weight % to 55 weight % water;

c) 20 weight % to 30 weight % sodium levulinate

d) 20 weight % to 55 weight % glycerol.

3. A method of producing a composition comprising

a) 5 weight % to 10 weight % sodium salts of p-methoxybenzoic acid;

b) 5 weight % to 55 weight % water;

c) 20 weight % to 30 weight % sodium levulinate

d) 20 weight % to 55 weight % glycerol; the method comprising dispersing p-methoxybenzoic acid in glycerol, subsequently adding an amount of aqueous sodium hydroxide which is equimolar to the calculated total amount of acids, adjusting the pH-value to 7.0-8.0 with levulinic acid and adding the remaining water.

4. The composition of claim 1 wherein component c) comprises a sodium salt of levulinic acid, a potassium salt of levulinic acid, a sodium salt of lactic acid, a potassium salt of lactic acid, a sodium salt of citric acid, a potassium salt of citric acid, or an ammonium salts of the formula HNR 3 + , wherein R═H, alkyl, hydroxyalkyl.

5. The composition of claim 1 wherein component d) comprises a glycol, a glycerol, or an ester of sorbitan.

6. The composition of claim 1 wherein component d) comprises propylene glycol, butylene glycol, dipropylene glycol, 2-methylpropanediol, polyglyceryl-10 laurate, or sorbitan laurate.

7. The composition of claim 1 wherein component c) comprises a sodium salt of levulinic acid, a potassium salt of levulinic acid, a sodium salt of lactic acid, a potassium salt of lactic acid, a sodium salt of citric acid, a potassium salt of citric acid, or an ammonium salts of the formula HNR 3 + , wherein R═H, alkyl, hydroxyalkyl; and wherein component d) comprises propylene glycol, butylene glycol, dipropylene glycol, 2-methylpropanediol, polyglyceryl-10 laurate, or sorbitan laurate.

8. The composition of claim 1 comprising:

 5 g

p-methoxybenzoic acid

 30 g

glycerol

15.0 g 

10% sodium hydroxide in water

100 g

water.

9. The composition of claim 1 comprising:

  5 g

p-methoxybenzoic acid

31.5 g

polyglyceryl-10 laurate

14.0 g

10% sodium hydroxide in water

 100 g

water

said composition having a pH = 7.5.

10. The composition of claim 1 comprising:

 5 g

p-methoxybenzoic acid

21 g

levulinic acid

19 g

45% aqueous sodium hydroxide

50 g

glycerol

100 g 

water

said composition having a pH = 7.5.

11. The composition of claim 1 comprising:

 7.5 g

p-methoxybenzoic acid

22.5 g

levulinic acid

21.5 g

45% aqueous sodium hydroxide

  25 g

glycerol

 100 g

water

said composition having a pH = 7.5.

12. A perfume, masking agent, aromatizing, cosmetic or dermatologic formulation which comprises a liquid, composition comprising:

a 5-15 weight % p-methoxybenzoic acid, or salt thereof;

b) 5-60 weight % of water; and at least one of c) and/or d):

c) 20-55 weight % one or more of an organic acid and/or their salts;

d) 20-60 weight % one or more of a polyol, an ester of polyglycerol and an ester of sorbitan; said composition having a pH of 7.0-8.0.

13. The formulation of claim 12 wherein the liquid, composition comprises:

a) 5 weight % to 10 weight % sodium salts of p-methoxybenzoic acid;

b) 5 weight % to 55 weight % water;

c) 20 weight % to 30 weight % sodium levulinate

d) 20 weight % to 55 weight % glycerol.

14. The formulation of claim 12 wherein component c) comprises a sodium salt of levulinic acid, a potassium salt of levulinic acid, a sodium salt of lactic acid, a potassium salt of lactic acid, a sodium salt of citric acid, a potassium salt of citric acid, or an ammonium salts of the formula HNR 3 30 , wherein R═H, alkyl, hydroxyalkyl.

15. The formulation of claim 12 wherein component d) comprises a glycol, a glycerol, or an ester of sorbitan.

16. The formulation of claim 12 wherein component d) comprises propylene glycol, butylene glycol, dipropylene glycol, 2-methylpropanediol, polyglyceryl-10 laurate, or sorbitan laurate.

17. The formulation of claim 12 wherein the liquid, composition comprises:

 5 g

p-methoxybenzoic acid

 30 g

glycerol

15.0 g 

10% sodium hydroxide in water

100 g

water.

18. The formulation of claim 12 wherein the liquid, composition comprises:

  5 g

p-methoxybenzoic acid

31.5 g

polyglyceryl-10 laurate

14.0 g

10% sodium hydroxide in water

 100 g

water

said composition having a pH = 7.5.

19. The formulation of claim 12 wherein the liquid, composition comprises:

 5 g

p-methoxybenzoic acid

21 g

levulinic acid

19 g

45% aqueous sodium hydroxide

50 g

glycerol

100 g 

water

said composition having a pH = 7.5.

20. The formulation of claim 12 wherein the liquid, composition comprises:

 7.5 g

p-methoxybenzoic acid

22.5 g

levulinic acid

21.5 g

45% aqueous sodium hydroxide

  25 g

glycerol

 100 g

water

said composition having a pH = 7.5.