AU2015201680B2

AU2015201680B2 - Urea based skin treatment

Info

Publication number: AU2015201680B2
Application number: AU2015201680A
Authority: AU
Inventors: David Roberts
Original assignee: Neat Feat Products Ltd
Current assignee: Neat Feat Products Ltd
Priority date: 2015-04-01
Filing date: 2015-04-01
Publication date: 2016-12-22
Anticipated expiration: 2035-04-01
Also published as: AU2015201680A1; AU2016265981B2; AU2016265981A1

Abstract

A topical formulation for treating human skin, having: * urea; * film forming polymer; 5 0 humectant; * preservative; and * water the above ingredients being combined such that the preservative protects the formulation against bacterial invasion, the humectant assists the formulation to 10 retain water, and the water and film forming polymer enable the urea to be applied to human skin such that the urea sits on the skin as a stable film and is gradually absorbed into the skin to alleviate dryness or cracking.

Description

1 2015201680 29 Nov 2016

COMPLETE SPECIFICATION

TITLE

Urea based skin treatment. 5

FIELD OF INVENTION A preferred form of this invention relates to a urea based treatment for human skin, particularly for one’s feet, and especially, but not necessarily, the heels.

10 BACKGROUND

Many people suffer from dry skin at their feet. In some cases, the skin may flake off or crack. It is known to apply urea based heel balms to the feet as it is thought this helps the skin to retain a healthy amount of water. Some known products rely on heavy oily emulsions to get the urea into the skin, but a downside is that they can be messy and 15 may cause staining of bed linen, etc. They can also make the feet undesirably slippery, which may present a safety risk. It is an object of a preferred embodiment of the invention to go at least some way towards addressing at least some of these shortcomings. While this object applies to the preferred embodiment, it should be understood that the object of the invention per se is simply to provide the public with a 20 useful choice. Therefore, any objects applicable to the preferred embodiment should not be taken as a limitation on the scope of the claims to protection set out later in this document.

The term “comprises” or derivatives of this should not be interpreted as limiting. For 25 example, if used in relation to a combination of features it should be taken to indicate that optionally, but not necessarily, there may be additional features that have not been mentioned.

SUMMARY OF INVENTION 30 According to one aspect of the invention there is provided a topical formulation for treating human skin, having: • about 25% to about 35% urea by weight; • film forming polymer; • humectant; 35 · preservative; and 2 2015201680 29 Nov 2016 • water the above ingredients being combined such that the preservative protects the formulation against bacterial invasion, the humectant assists the formulation to retain water, and the water and film forming polymer enable the urea to be applied to human 5 skin such that the urea sits on the skin as a stable film and is gradually absorbed into the skin to alleviate dryness or cracking, the film being substantially waterproof.

Optionally the formulation has about 30% urea, by weight. 10 Optionally the formulation having 25% to 35% urea, by weight.

Optionally the formulation having 30% urea, by weight.

Optionally the film forming polymer comprises a urethane polymer. 15

Optionally the film forming polymer comprises PPG-17/IDPI/DMPA copolymer. Optionally the humectant comprises glycerine. 20 Optionally the preservative comprises one or more of phenoxyethanol, methyl paraben, ethyl paraben, propyl paraben and butyl paraben, and preferably a combination of all of these.

Optionally the preservative comprises Salichem (phenoxyethanol and methylparaben 25 and ethylparaben and propylparaben and butylparaben) preservative or Phenonip (phenoxyethanol and methylparaben and ethylparaben and propylparaben and butylparaben and isobutylparaben) preservative.

According to a broader aspect of the invention, there is provided topical formulation for 30 treating human skin, having: • about 25% to about 35% urea, by weight; • film forming polymer; and • water the above ingredients being combined such that the water and film forming polymer 35 enable the urea to be applied to human skin such that the urea sits on the skin as a 3 2015201680 29 Nov 2016 stable film and is gradually absorbed into the skin to alleviate dryness or cracking, the file being substantially waterproof.

According to another aspect of the invention, there is provided use of: • about 25% to about 35% urea, by weight; • film forming polymer; • humectant; • preservative; and • water 10 in the preparation of a topical formulation for treating human skin such that the urea site on the skin as a stable film and is gradually absorbed into the skin to alleviate dryness or cracking and wherein the film is substantially waterproof, the preservative protects the formulation against bacterial invasion, the humectant assists the formulation to retain water, and the water and film forming polymer enable the urea to be applied to the skin.

Optionally the use comprises use where the formulation has about 30% urea by weight. 20 Optionally the use comprises use where the formulation has 30% urea by weight.

Optionally the use comprises use where the formulation has 25% to 35% urea by weight. 25 Optionally the use comprises use where the film forming polymer of the formulation comprises a urethane polymer.

Optionally the use comprises use where the urethane polymer of the formulation comprises PPG-17/IPDI/DMPA copolymer. 30

Optionally the use comprises use where the humectant of the formulation comprises glycerine.

Optionally the use comprises use where the preservative of the formulation comprises 35 one or more of phenoxyethanol, methylparaben, ethylparaben, propylparaben and butylparaben. 4 2015201680 29 Nov 2016

Optionally the use comprises use where the preservative of the formulation comprises phenoxyethanol and methylparaben and ethylparaben and propylparaben and butylparaben preservative or phenoxyethanol and methylparabel and ethylparaben and 5 propylparaben and butylparaben and isobutylparaben preservative.

Optionally the use comprises use where the formulation has urea in an amount of 25 -35% but weight, the film forming polymer comprises a polyurethane substance and the humectant comprises glycerine. 10

Optionally the use comprises use where the formulation has urea in an amount of approximately 30% by weight.

DETAILED DESCRIPTION 15 According to a preferred embodiment of the invention a topical formulation for heel skin is prepared from a mixture of the following ingredients:

Ingredient Amount (grams) Function Urea 300 therapeutic agent water 603 Solvent Avalure 450 polymer (PPG-17/IPDI/DMPA copolymer) 45 Film forming polymer Glycerine 50 humectant Salichem (phenoxyethanol and methylparaben and ethylparaben and propylparaben and butylparaben) preservative or Phenonip (phenoxyethanol and methylparaben and ethylparaben and propylparaben and 2 preservative 5 2015201680 29 Nov 2016 butylparaben and isobutylparaben) preservative

It had not previously been known to formulate urea with a film forming polymer and, when done, the inventor found that it gave surprisingly good results.

The formulation is preferably prepared according to the following procedure - a) obtain 603 gm of water at room temperature; b) slowly add 300 gm of urea to the water, with constant stirring, until completely dissolved; 10 c) slowly add 45 gm of Avalure 450 (PPG-17/IPDI/DMPA copolymer)_film forming polymer to the mix, with constant stirring, until a milky white homogeneous solution is achieved; d) add 50 gm of glycerine to the mix, with constant stirring, until dissolved; e) add 2 gm of a preservative to the mix (e.g. phenoxyethanol, methyl paraben, ethyl paraben, propyl paraben and butyl paraben), with constant stirring, until dissolved; and f) continue mixing until a milky-white solution free of particles is achieved.

When created, the formulation is substantially waterproof (i.e. will not readily wash off 20 the skin), is non-staining and does not have the sort of greasy or oily consistency of many prior art formulations.

As indicated in the table, the urea is preferably at an amount of 30% by weight. However, in other embodiments of the invention there may be more, or less. For 25 example, the urea may be at 25-35% by weight.

As well as providing humectant functionality, the glycerine assists in making the formulation smooth. It imparts lubricant type characteristics. 30 It will be appreciated that alternative film forming polymers, humectants and preservatives may be used in place of those specifically mentioned above. However, in each case the film forming polymer will be sufficient to give a stable urea containing film when applied to a human topically, and at least much of the urea able to be readily 2015201680 29 Nov 2016 6 absorbed into the skin. Preferably the formulation is a spray-on one and is delivered by way of a spray dispenser.

While some preferred forms of the invention have been described by way of example, 5 it should be understood that modifications and improvements can occur without departing from the scope of the following claims.

Claims

1. Use of: • about 25% to about 35% urea, by weight; • film forming polymer; • humectant; • preservative; and • water in the preparation of a topical formulation for treating human skin such that the urea sits on the skin as a stable film and is gradually absorbed into the skin to alleviate dryness or cracking, and wherein the film is substantially waterproof, the preservative protects the formulation against bacterial invasion, the humectant assists the formulation to retain water, and the water and film forming polymer enable the urea to be applied to the skin.

2. Use according to claim 1, wherein the formulation has about 30% urea by weight.

3. Use according to claim 1 or claim 2, wherein the formulation has 30% urea by weight.

4. Use according to claim 1, wherein the formulation has 25% to 35% urea by weight.

5. Use according to any one of claims 1 to 4, wherein film forming polymer of the formulation comprises a urethane polymer.

6. Use according to claim 5, wherein the urethane polymer of the formulation comprises PPG-17/IPDI/DMPA copolymer.

7. Use according to any one of claims 1 to 6, wherein the humectant of the formulation comprises glycerine.

8. Use according to any one of claims 1 to 7, wherein the preservative of the formulation comprises one or more of phenoxyethanol, methylparaben, ethylparaben, propylparaben and butylparaben.

9. Use according to any one of claims 1 to 7 wherein the preservative of the formulation comprises phenoxyethanol and methylparaben and ethylparaben and propylparaben and butylparaben preservative or phenoxyethanol and methylparabel and ethylparaben and propylparaben and butylparaben and isobutylparaben preservative.

10. Use according to claim 1, wherein the formulation has urea in an amount of 25 - 35% but weight, the film forming polymer comprises a polyurethane substance and the humectant comprises glycerine.

11. Use according to claim 10, wherein the formulation has urea in an amount of approximately 30% by weight.