Polymer compositions having a low coefficient of friction

Abstract

Polymer compositions which have a low coefficient of friction are disclosed. The polymer compositions comprise a blend of at least 80 percent by weight of a solid of film-forming polymer and at least 0.35 percent by weight of a crosslinked silicone polycarbinol. The described composition retains its low coefficient of friction even after being exposed to hydrocarbon solvents during a cleaning process. The described compositions are particularly useful in forming protective layers for elements, particularly photographic elements.

What is claimed is: 
     
       1. A composition comprising a blend of at least 80 percent by weight of a polymer and at least 0.35 percent by weight of a crosslinked .[.silicone polycarbinol.]. .Iadd.member of the group consisting of: (a) a hydroxy-terminated polysiloxane of the general structure: ##STR3## wherein each of R 1  and R 2  is independently selected from the group consisting of hydrogen, alkyl and aryl and w is an integer from about 100 to about 2500, and   (b) a graft hydroxy functionalized polysiloxane having the general structure: ##STR4## wherein R 1 , R 2 , R 3 , R 4  and R 5  are each independently selected from the group consisting of hydrogen, alkyl and aryl and R 6  is a divalent linking group and x and y are each independently selected from an integer from about 2 to about 15.Iaddend..   
     
     
       2. The composition of claim 1 wherein said polymer is a compatible polymer blend comprising: (a) cellulose nitrate; and   (b) a hydrophobic acrylate polymer, wherein said polymer blend has a sufficient amount of the acrylate polymer so as to have a glass transition temperature of at least about 50° C. and a sufficient amount of cellulose nitrate so as to be resistant to chlorinated hydrocarbon solvents. .[.3. A composition comprising a blend of a major amount of a polymer or polymer blend and a minor amount of a crosslinked member of the group consisting of a hydroxy-terminated polysiloxane of the general structure: ##STR5## wherein each of R 1  and R 2  is independently selected from hydrogen, alkyl and aryl and w is an integer from about 100 to about 2500 and a graft hydroxy functionalized polysiloxane having the general structure: ##STR6## wherein R 1 , R 2 , R 3 , R 4  and R 5  are each independently selected from hydrogen, alkyl and aryl and R 6  is a divalent linking group and x and y are each independently selected from an   
     
     
        integer from about 2 to about 15..]. 4. A composition comprising a solvent, a polymer, a silicone polycarbinol, a multifunctional crosslinking reagent and a catalyst to catalyze the crosslinking of the 
     
     
        silicone polycarbonol by the crosslinking reagent. 5. An element comprising a support having thereon a layer comprising a blend of a major amount of a polymer or polymer blend and a minor amount of a crosslinked 
     
     
        silicone polycarbinol. 6. The element of claim 5 wherein said polymer is a compatible polymer blend comprising: (a) cellulose nitrate; and   (b) a hydrophobic acrylate polymer, wherein said polymer blend has sufficient amount of the acrylate polymer so as to have a glass transition temperature of at least about 50° C. and a sufficient amount of cellulose nitrate so as to be resistant to chlorinated hydrocarbon   
     
     
        solvents. 7. The element comprising a support having thereon a layer comprising a blend of a major amount of a polymer or polymer blend and a minor amount of crosslinked member of the group consisting of a hydroxy-terminated polysiloxane of the general structure: ##STR7## wherein each of R 1  and R 2  is independently selected from hydrogen, alkyl and aryl and w is an integer from about 100 to about 2500 and a graft hydroxy functionalized polysiloxane having the general structure: ##STR8## wherein R 1 , R 2 , R 3 , R 4 , and R 5  are each independently selected from hydrogen, alkyl and aryl and R 6  is a divalent linking group and x and y are each independently selected from an integer from about 2 to about 15.