Materials and methods utilizing a temporary visual indicator

• US 5,523,075 A
• Filed: 05/13/1993
• Issued: 06/04/1996
• Est. Priority Date: 05/13/1993
• Status: Expired due to Fees

• Current Assignee: Christopher D. Batich, Richard J. Melker, Ronnie S. Fuerst
• Original Assignee: Christopher D. Batich, Richard J. Melker, Ronnie S. Fuerst
• Inventors: Batich, Christopher D., Fuerst, Ronnie S., Melker, Richard J.
• Primary Examiner(s): Dodson, Shelley A.
• Application Number:
  US08/061,412
• Time in Patent Office: 1,118 Days
• Field of Search: 424/7.1
• US Class Current: 424/59
• CPC Class Codes: A61K 2800/45 Colour indicators, e.g. pH- or Redox indicators
• CPC Class Codes: A61K 6/20 Protective coatings for natural or artificial teeth, e.g. sealings, dye coatings or varnish
• CPC Class Codes: A61K 6/65 Dyes
• CPC Class Codes: A61K 8/046 Aerosols; Foams
• CPC Class Codes: A61K 8/4973 with oxygen as the only hetero atom
• CPC Class Codes: A61Q 17/04 Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
• CPC Class Codes: C09D 7/00 Features of coating compositions, not provided for in group C09D5/00 driers C09F9/00; Processes for incorporating ingredients in coating compositions
• CPC Class Codes: C11D 3/40 Dyes ; Pigments
• CPC Class Codes: G01N 31/221 for investigating pH value

Abstract

This invention relates to novel compositions containing temporary visual indicators and methods for using these compositions. Specifically, this invention relates to a sunscreen composition containing an indicator that is visible when the substance is applied to the skin, but becomes invisible shortly after application. The continued presence of the indicator allows the indicator to be reactivated temporarily to the visible form so that a user can verify the presence of the sunscreen. The visible indicator ensures that the sunscreen is applied evenly and completely to the area to be protected, but becomes invisible so as not to interfere with the action of the sunscreen or discolor the skin.

Claims

1. A cosmetic composition which can be applied to the skin to modify the effects of solar radiation, wherein said composition comprises:

(a) an effective amount of a first ingredient which, when applied to the skin changes its chemical form, thereby causing the pH of the composition to change from a first pH to a second pH; and

(b) an effective amount of a second ingredient which can be seen at first pH and which becomes colorless at said second pH to give a visual indication of said pH change of the composition said second ingredient is 3,3-bis [4-hydroxyphenyl]-1-[3H]-isobenzofuranone.

2. The composition, according to claim 1, wherein said first ingredient is a monoamine.

3. The composition, according to claim 1, wherein said first ingredient is a diamine.

4. The composition, according to claim 1, wherein said first ingredient is a cyclic amine.

5. The composition, according to claim 2, wherein said monoamine is ammonia.

6. The composition, according to claim 3, wherein said diamine is 1,3-diaminopropane.