Method for protecting human skin from ultraviolet radiation

Abstract

The specification discloses 4-N,N-bis-(2-hydroxyethyl)aminoacylphenones which are useful as sunscreening agents for absorbing intermediate range radiation. The acyl moiety is derived from the group of alkanoic acids having from 2 to about 16 carbon atoms.

1.  A method for protecting human skin from the erythemic effect of ultraviolet radiation which comprises applying to the skin a compound having the formula ##STR3## wherein n is an integer of from 1 to 3 and .[.R is an alkyl group.].rep ##STR4## .Iadd.is an acyl group .Iaddend.having from 2 to 16 carbon atoms .Iadd.derived from an alkanoic acid, .Iaddend.said compound being applied in an amount sufficient to screen out substantially all of the radiation having a wave length between about 297 nm and 320 nm. 
     
     
       2. The method of claim 1 wherein n is 2. 
     
     
       3. .[.The method of claim 1 wherein R is an alkyl group containing1 to 6 carbon atoms.]. .Iadd.A method for protecting human skin from the erythemic effect of ultraviolet radiation which comprises applying to the skin a compound having the formula: ##STR5## wherein n is an integer of from 1 to 3 and R is an alkyl group having from 1 to 6 carbon atoms, said compound being applied in an amount sufficient to screen out substantially all of the radiation having a wave length between about 297 nm and 320 nm. 
     
     
       4.  The method of claim .[.1.]. .Iadd.3 .Iaddend.wherein the compound has the formula: ##STR6## 
     
     
       5. The method of claim 1 wherein the compound has the formula ##STR7## 
     
     
       6. The method of claim 1 wherein the compound has the formula ##STR8## 
     
     
       7. The method of claim 1 wherein the compound has the formula ##STR9## .Iadd. 
     
     
       8.  A method for protecting human skin from the adverse effects caused by the influence of sunlight in the intermediate wave length range of from about 320 nm to 360 nm which comprises applying to said skin a composition containing from about 1% to about 10% by weight of a compound having the formula: ##STR10## wherein n is an integer of from 1 to 3 and ##STR11## is an acyl group having from 2 to 16 carbon atoms derived from an alkanoic acid, said composition being applied in sufficient amount to screen out substantially all the radiation having a wave length in the range of about between 320 nm and 360 nm. .Iadd. 
     
     
       9.  A method for protecting human skin from the adverse effects caused by the influence of sunlight in the intermediate wave length range of from about 320 nm to 360 nm which comprises applying to said skin a composition containing about 1.5% to about 6% by weight of a compound having the formula: ##STR12## wherein n is an integer of from 1 to 3 and R is an alkyl group having from 1 to 6 carbon atoms, said composition being applied in sufficient amount to screen out substantially all the radiation having a wave length in the range of about between 320 nm and 360 nm.