Polymer compositions having a low coefficient of friction

• US RE32,514 E
• Filed: 05/12/1986
• Issued: 10/06/1987
• Est. Priority Date: 06/14/1982
• Status: Expired due to Term

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Steklenski, David J.
• Primary Examiner(s): Foelak, Morton
• Assistant Examiner(s): Nutter, Nathan M.
• Application Number:
  US06/862,346
• Time in Patent Office: 512 Days
• Field of Search: 524/31, 524/32, 524/33, 430/272, 430/531, 430/631, 430/961, 428/446, 428/447, 427/387, 427/393.5
• US Class Current: 524/32
• CPC Class Codes: C08L 1/18 Cellulose nitrate , i.e. nitrocellulose
• CPC Class Codes: G03C 1/7614 Cover layers; Backing layers; Base or auxiliary layers characterised by means for lubricating, for rendering anti-abrasive or for preventing adhesion characterised by the inert particulate additive G03C1/95
• CPC Class Codes: G03C 11/08 Varnishing, e.g. application of protective layers on finished photographic prints
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

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.

Claims

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 R¹ and R² 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 R¹, R², R³, R⁴ and R⁵ are each independently selected from the group consisting of hydrogen, alkyl and aryl and R⁶ 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 R¹ and R² 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 R¹, R², R³, R⁴ and R⁵ are each independently selected from hydrogen, alkyl and aryl and R⁶ is a divalent linking group and x and y are each independently selected from an

3. 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

4. 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

5. 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

6. 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 R¹ and R² 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 R¹, R², R³, R⁴, and R⁵ are each independently selected from hydrogen, alkyl and aryl and R⁶ is a divalent linking group and x and y are each independently selected from an integer from about 2 to about 15.