Cosmetic containers

Abstract

Containers for nail polish and other liquid cosmetics are produced with substantially transparent cyclo-olefin copolymers, preferably norbornene-ethylene copolymers, blended with tint modifiers having a tint or hue that opposes the tint imparted to the container by the primary cyclo-olefin copolymer. This produces a bottle with a significantly reduced tint, and displays nail polish, other liquid cosmetics and similar materials with less color distortion.

We claim:  
     
         1 . A cosmetic container comprising a substantially transparent primary cyclo-olefin copolymer and a tint modifier, said tint modifier being present in an amount sufficient to give said container a Yellowness Index between about −0.2 and about +0.2.  
     
     
         2 . A container according to  claim 1  wherein said primary cyclo-olefin copolymer comprises a copolymer of norbornene and ethylene.  
     
     
         3 . A container according to  claim 1  wherein said tint modifier comprises a cyclo-olefin copolymer and a coloring agent.  
     
     
         4 . A container according to  claim 3  wherein said tone modifier comprises a copolymer of norbornene and ethylene and said coloring agent, and said primary cyclo-olefin copolymer comprise copolymers of norbornene and ethylene.  
     
     
         5 . A container according to  claim 4  wherein said tint modifier has substantially the same composition as said primary cyclo-olefin copolymer, but has enhanced flow properties.  
     
     
         6 . A container according to  claim 4  wherein said coloring agent comprises a blue pigment.  
     
     
         7 . A container according to  claim 2  wherein said cyclo-olefin copolymer has a glass transition temperature between about 80° C. and about 180° C.  
     
     
         8 . A container according to  claim 2  wherein said cyclo-olefin copolymer has a glass transition temperature of about 160° C.  
     
     
         9 . A container in accordance with  claim 1  having a comparative Yellowness Index of less than about +0.2.  
     
     
         10 . A container in accordance with  claim 1  having a Yellowness Index between about 0 and about +0.2.  
     
     
         11 . A container in accordance with  claim 1  having a Yellowness Index between about 0 and about +0.1.  
     
     
         12 . A nail polish bottle comprising a cyclo-olefin copolymer having a glass transition temperature of at least about 160° C. and a tint modifier in a quantity sufficient to give said bottle a Yellowness Index of about −0.2 to about +0.2.  
     
     
         13 . A nail polish bottle according to  claim 12  wherein said cyclo-olefin copolymer comprises a copolymer of norbornene and ethylene.  
     
     
         14 . A nail polish bottle according to  claim 12  wherein said tint modifier comprises a cyclo-olefin copolymer and a coloring agent.  
     
     
         15 . A nail polish bottle according to  claim 14  wherein said cyclo-olefin copolymer comprises a copolymer of norbornene and ethylene.  
     
     
         16 . A method for producing cosmetic containers comprising: 
 providing a cyclo-olefin copolymer;    blending a coloring agent with said copolymer in an amount sufficient to give said container a comparative Yellowness Index of less than about +0.2; and    molding said containers from said blended cyclo-olefin copolymer and coloring agent.    
     
     
         17 . A method in accordance with  claim 16  wherein said coloring agent is blended with said copolymer in an amount sufficient to give said container a comparative Yellowness Index of between about 0 and about +0.1.  
     
     
         18 . A method according to  claim 16  wherein said copolymer is prepared by co-polymerizing ethylene and norbornene with a metallocene catalyst.  
     
     
         19 . A method according to  claim 16  wherein said copolymer is prepared by co-polymerizing ethylene and norbornene with a metallocene-aluminoxane catalyst.