Nova Patents
EP0848944A2

Sunscreen composition comprising long, branched chain alkyl benzoates or hydroxybenzoates

Abstract

In one embodiment there is disclosed a sunscreen composition containing a UV-B dibenzoylmethane derivative, such as 4-(1,1-dimethylethyl) -4'-methoxydibenzoylmethane (PARSOL 1789), and a stabilizer/solubilizer for the dibenzoylmethane derivative selected from formula (I) and formula (II), and mixtures thereof: wherein m = 5, 7, 9 or mixtures and n = 4, 6, 8 or mixtures; wherein m = 5, 7 or mixtures and n = 4, 6 or mixtures. These long branched chain alkyl hydroxybenzoates and long branched chain benzoates having a C4+ branch at the 2 position are quite effective in stabilizing the dibenzoylmethane derivative UV-B filter compounds making them more effective; effective for longer periods of time.

EP0848944A2, drawing sheet 1
Sheet 1 of 18

Term

Term ended

Projected expiry passed 19 November 2017, 8.8 years ago.

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18 claims: 7 independent, 11 dependent

  1. 1
    A compound of formula (I) wherein m = 5, 7, 9 or mixtures and n = 4, 6, 8 or mixtures or formula (II) wherein m = 5, 7 or mixtures and n = 4, 6 or mixtures.
  2. 5
    A composition as claimed in any one of claims 2 to 4, wherein said dibenzoylmethane derivative is selected from the group consisting of 4-(1,1-dimethylethyl)-4'-methoxydibenzoylmethane;4-isopropyl dibenzoylmethane;and mixtures thereof.
  3. 7
    A composition as claimed in any one of claims 2 to 6, wherein the dibenzoylmethane derivative is included in the composition in an amount of about 2% to 3% by weight of the composition.
  4. 8
    A composition as claimed in any one of claims 2 to 7, wherein the stabilizing compound is included in the composition in an amount of about 1% to about 10% by weight of the composition.
  5. 9
    A composition as claimed in any one of claims 2 to 8, wherein the stabilizing compound is selected from the group consisting of 2-butyloctyl benzoate, 2-hexyldecyl benzoate, 2-butyloxtyl hydroxybenzoate, and mixtures thereof.
  6. 13
    A composition as claimed in any one of claims 1 to 7, comprising a mixture of a compound of formula (I) and a compound of formula (II) in a weight ratio of (I):(II) in the range of 1:3 to 3:1 wherein m = 5, 7, 9 or mixtures and n = 4, 6, 8 or mixtures;and wherein m = 5, 7 or mixtures and n = 4, 6 or mixtures.
  7. 15
    A method of filtering out ultraviolet radiation from human skin composition topically applying to said skin a composition as claimed in any one of claims 2 to 14.
Independent claims7