Patent GB-766863-A (GB)
Title: Suntan lotions
IPC: A61Q17/04
Filed: 1955-03-24
Abstract: A synthetic resin composition which may be used as a suntan preparation comprises an aqueous solution of a polymeric N-vinyl lactam and an ultra-violet absorbing agent of formula <FORM:0766863/IV(a)/1> wherein one of the radicals R and R1 represents hydrogen and the other a sulphonic acid group or the ammonium, amine or alkali-metal salt of such group and R11 represents hydrogen or an alkyl group.  Specified polymeric N-vinyl lactams are those derived from 1-vinyl-2-pyrrolidone, 1 - vinyl - 5 - methyl - 2 - pyrrolidone, 1-vinyl - 2 piperidone and N - vinyl-e  caprolactam. Ultra-violet absorbing agents specified include 2,21-dihydroxy-4,41-dimethoxy-benzophenone sulphonic acid sodium salt, 2,21,4 - trihydroxy - 41 - methoxybenzophenone sulphonic acid sodium salt, 2,214,41-tetrahydroxybenzophenone sulphonic acid, and 2,4-dihydroxybenzophenone sulphonic acid sodium salt. Plasticizers such as ether glycerol, glycol and 1,2,4-butanetriol may be added. Films and foils, e.g. of gelatin, hydroxycellulose, hydroxy-ethyl cellulose, cellulose hydrate or polyvinyl alcohol may be impregnated with the benzophenone sulphonic acids or their salts to give photographic filters, wrappers for food products and window shades. U.S.A. Specifications 2,265,450, 2,317,804 and 2,335,454 are referred to.ALSO:Compounds of formula <FORM:0766863/IV(b)/1> wherein one of the radicals R and R1 represents hydrogen and the other a sulphonic acid group or the ammonium, amine or alkali metal salt of such group and R11 represents hydrogen or an alkyl group are prepared by adding the di-, tri- or tetrahydroxybenzophenone to sulphuric acid monohydrate and allowing the mixture to stand for 30-60 minutes.  It is then poured on to ice, powdered calcium carbonate added and the precipitated calcium sulphate filtered off.  Ammonium, lithium and potassiumhydroxides, carbonates or chlorides and amines such as methylamine, trimethylamine, laurylamine and aniline may be added to give the appropriate salt.  The products may be used as ultra-violet absorbing agents.ALSO:Suntan preparations comprise an aqueous solution of a polymeric N-vinyl lactam and an ultra-violet absorbing agent of formula <FORM:0766863/VI/1> wherein one of the radicals R and R1 represents hydrogen and the other a sulphonic acid group or the ammonium, amine or alkali-metal salt of such group and R11 represents hydrogen or an alkyl group.  Specified polymeric N-vinyl lactams are those derived from 1-vinyl-2-pyrrolidone, 1-vinyl-5-methyl-2-pyrrolidone, 1-vinyl-2-piperidone and N-vinyl-e -capro - lactam.  Ultra - violet absorbing agents specified include 2, 21-dihydroxy-4, 41-dimethoxybenzophenone sulphonic acid sodium salt, 2, 21, 4-trihydroxy-41-methoxy benzophenone sulphonic acid sodium salt, 2, 21, 4, 41-tetrahydroxy benzophenone sulphonic acid, and 2, 4-dihydroxy-benzophenone sulphonic acid sodium salt. Plasticizers such as ether glycerol, glycol and 1, 2, 4-butanetriol, water-soluble essential oils, perfumes, dyes, pigments and colouring matters may be added. Several examples are given.  Specification 706,151 and U.S.A. Specifications 2,265,450, 2,317,804, 2,335,454 and 2,686,812 are referred to.