Release coating for infrared imageable and thermally imageable films

• US 4,482,608 A
• Filed: 07/26/1982
• Issued: 11/13/1984
• Est. Priority Date: 07/26/1982
• Status: Expired due to Fees

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Isbrandt, Russell R., Lowery, Robert D.
• Primary Examiner(s): Herbert, T. J.
• Application Number:
  US06/401,842
• Time in Patent Office: 841 Days
• Field of Search: 428/421, 428/262, 428/341, 428/913, 428/195, 560/115, 260/29.6 F, 260/399, 526/245, 526/246, 526/243, 430/47, 430/9, 430/13, 430/4, 430/944, 430/907, 430/200, 430/211, 149/19.1
• US Class Current: 428/421
• CPC Class Codes: B41M 5/446 Fluorine-containing polymers
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10S 430/108 Polyolefin or halogen containing
• CPC Class Codes: Y10S 430/145 Infrared
• CPC Class Codes: Y10T 428/3154 Of fluorinated addition polymer from unsaturated monomers

Abstract

Coating for infrared transparency films and thermally imageable films and films prepared with such coating. The coating comprises a copolymer formed from (a) at least one fluorocarbon monomer and (b) at least one monomer which imparts hardness to the copolymer. The coating serves to prevent the transfer of toner powder from an original which is in actuality an electrophotographic copy to the transparency film. The copolymer may contain from about 12 percent to about 85 percent fluorocarbon monomer, the remainder being the monomer which imparts hardness to the coating. Suitable monomers for imparting hardness to the copolymer include acrylates, methacrylates, acrylamides, methacrylamides, acrylonitriles, methacrylonitriles, and styrenes.

Claims

1. Film for preparing transparencies by means of infrared imaging or thermal imaging, said film bearing an imageable layer having a top coat consisting essentially of a copolymer formed from (a) at least one fluorocarbon monomer selected from the group consisting of fluoroaliphatic acrylates and fluoroaliphatic methacrylates, and (b) at least one monomer which imparts hardness to the copolymer.

2. The film of claim 1 wherein said fluorocarbon monomer or monomers comprises from about 12 to about 85 percent by weight of the copolymer and said monomer or monomers which imparts hardness to the copolymer comprises from about 15 to about 88 percent by weight of the copolymer.

3. The film of claim 1 wherein the hardness imparting monomer or monomers is selected from the group consisting of styrene, α

-methyl styrene, β

-methyl styrene, acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, methyl methacrylate, ethyl methacrylate, methyl acrylate.

4. The film of claim 1 wherein the coating has a Sward hardness of at least about 40.

5. The film of claim 1 wherein said fluorocarbon monomer or monomers is represented by the formula ##STR7## wherein R_f is a perfluoroalkyl group containing 3 to 20 carbon atoms,

R¹ is an alkylene bridging group containing 1 to 16 carbon atoms, and

R² is --H or --CH₃.

6. The film of claim 1 wherein said fluorocarbon monomer or monomers is represented by the formula ##STR8## wherein R_f is a perfluoroalkyl group containing 3 to 20 carbon atoms,

R⁶ is an alkyl side group containing 1 to 6 carbon atoms,

R⁷ is an alkylene bridging group containing 1 to 16 carbon atoms, and

R⁸ is --H or --CH₃.

7. The film of claim 6 wherein said fluorocarbon monomer or monomers is a mixture of ##STR9##

8. Method of preparing a transparency by means of infrared imaging or thermal imaging, said transparency being produced from the film of claim 1.