Containers coated by deposition of a sol-gel on their inner surface

Abstract

The present invention relates to containers having, on all or part of their inner surface, a mineral-oxide-based coating obtained by sol-gel deposition, which containers are found to be particularly suitable for the packaging of cosmetic compositions.

1 . A container comprising:
 a body, and on all or part an inner surface of the body, a mineral-oxide-based coating;   wherein the mineral-oxide-based coating is obtained by sol-gel deposition.   
     
     
         2 . The container according to  claim 1 ,
 wherein the the sol-gel deposition comprises a mineral precursor of at least one silicon alkoxide having the formula:
   Si(OR) 3 R′  (I)
 
   wherein:   each R, is independently, an alkyl group; and   R′ is an alkoxy group which may be identical to OR, different from OR; or a different organic group.   
     
     
         3 . The container according to  claim 1 , wherein on the inner surface coating comprises macromolecular species trapped within a mineral-oxide-based structure and/or the coating is functionalised by functional groups bonded covalently to the coating. 
     
     
         4 . The container according to  claim 1 , wherein the body is transparent, and the coating on the inner surface is a colored or has a visual appearance different from that of the body, and is visible through the body of the container. 
     
     
         5 . The container according to  claim 4 , wherein a coloring agent is covalently bonded to a surface of the coating. 
     
     
         6 . The container according to  claim 5 , wherein the coating on the inner surface of the container is obtained by a method comprising:
 (A 1 ) reacting a coloring agent having a reactive functional group R r  with a silicon alkoxide of formula (I 1 ):
   Si(OR)3R C    (I 1 )
 
   wherein:   each R, independently, is an alkyl group; and   R C  is a functional group which reacts with the functional group R r  to form a covalent bond between the coloring agent and the silicon alkoxide, whereby the silicon alkoxide of formula (I) is obtained:
   Si(OR)3R′  (I),
 
   wherein R is as previously defined and   R′ is a group resulting from the reaction of the functional group R c  with the R r  functional group of the coloring agent; and then   (B 1 ) sol-gel coating the inner surface of the container with the silicon alkoxide mineral precursor (I) obtained in (A 1 ), optionally in association with a silicon alkoxide of formula
   Si(OR″) 4  
 
   wherein each R″, is, independently, an alkyl group.   
     
     
         7 . The container according to  claim 6 , wherein R r  is —OH and R c  is —C═N═O, and
 the silicon alkoxide (I 1 ) is 3-isocyanatopropyltriethoxy-silane; (CH 2 H 5 O) 3 Si—(CH) 3 —NCO. 
 
     
     
         8 . The container according to  claim 6 , wherein, in (B 1 ), the sol-gel coating comprises a mixture of the silicon alkoxide of formula (I) and tetraethoxysilane. 
     
     
         9 . The container according to  claim 4 , wherein the coating on the inner surface comprises particles trapped within the mineral- oxide-based structure of the coating that modify light absorption, reflection or refraction properties of the coating. 
     
     
         10 . The container according to  claim 9 , wherein the particles trapped in the coating comprise at least one selected from the group consisting of colored pigment particles, mother-of-pearl particles and metallic particles. 
     
     
         11 . The container according to  claims 1 , comprising a transparent body, wherein
 the coating on the inner surface comprises a covalently bonded compound that absorbs radiation in the ultraviolet range.   
     
     
         12 . The container according to  claim 11 , wherein the covalently bonded compound that absorbs radiation in the ultraviolet range is a benzophenone. 
     
     
         13 . The container according to  claim 11 , wherein the coating present on the inner surface of the container is obtained by a process, comprising:
 (A 2 ) reacting a compound that absorbs radiation in the ultraviolet range having a reactive functional group R r  with a silicon alkoxide of formula (I 2 ):
   Si(OR) 3 R c    (I 2 )
 
   wherein: each is independently an alkyl group; and   R c  is a functional group which reacts with the functional group R r  to form a covalent bond between the compound that absorbs in the ultraviolet range and the silicon alkoxide, whereby there is formed a silicon alkoxide of formula (I):
   Si(OR) 3 R 1    (I),
 
   wherein R has the meaning given hereinbefore and   R′ is a group resulting from the reaction of the functional group R c  with the reactive functional group R r ; and then   (B 2 ) sol-gel coating the inner surface of the container with the silicon alkoxide mineral precursor (I) obtained in (A 2 ), optionally in association with a silicon alkoxide of formula
   Si(OR″) 4  
 
   wherein each R″ is, independently, an alkyl group.   
     
     
         14 . The container according to  claim 13 , wherein
 R r  is —OH, R c  is —C═N═O, and   the silicon alkoxide (I 1 ) is 3-isocyanatopropyltriethoxy-silane: (CH 2 H 5 O) 3 Si—(CH 2 ) 3 —NCO.   
     
     
         15 . The container according to  claim 13 , wherein, in (B 2 ), the sol-gel coating comprises a mixture of the silicon alkoxide of formula (I) and tetraethoxysilane. 
     
     
         16 . The container according to  claim 4 , wherein the body of the container is made of glass. 
     
     
         17 . The container according to  claim 1 , wherein the container is a vial or a bottle. 
     
     
         18 . A cosmetic package, comprising:
 a cosmetic composition; and   the container according to  claim 1 ;   wherein the cosmetic composition is contained in the container.   
     
     
         19 . The cosmetic package according to  claim 18 , wherein the cosmetic composition is at least one selected from the group consisting of a composition in liquid form, a water-based composition, an alcoholic composition and an aqueous-alcoholic composition.