Skin bleaching preparations
AssigneeWarner-Lambert Company
InventorVito G. Filomeno
Life of this patent
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Abstract
A skin bleaching skin preparation is disclosed. The preparation comprises hydroquinone, tertiary butyl hydroquinone, and optionally an additional stabilizer. The preparation can additionally contain a buffer to maintain the pH between about 3.5 and about 7.5. By maintaining this pH range in the presence of the tertiary butyl hydroquinone stabilizer, and optional additional stabilizers, the hydroquinone would not be oxidized, and thus the preparation would be characterized by an extended shelf life.
Claims8
A skin bleaching skin preparation, excluding detergent bars, comprising:
- (a) hydroquinone in amounts of about 1% to about 5% by weight of the total composition;
- and
- (b) tertiary butyl hydroquinone in amounts of about 0.1% to about 0.5% by weight of the total composition.
A skin bleaching skin preparation, excluding detergent bars, comprising:
- (a) hydroquinone in amounts of about 1% to about 5% by weight of the total composition;
- (b) tertiary butyl hydroquinone in amounts of about 0.1% to about 0.5% by weight of the total composition;
- and
- (c) an additional stabilizer in amounts of about 0.05% to about 0.3% by weight of the total composition, wherein said additional stabilizer is selected from the group consisting of sodium sulfite, sodium bisulfite, alpha tocopherol, and mixtures thereof, and wherein the total amount of said tertiary butyl hydroquinone and said additional stabilizer does not exceed about 0.6% by weight of the total composition.
Dependencies are inferred from the claim text.