Low surface energy liner of perfluoropolyether

• US 4,472,480 A
• Filed: 07/02/1982
• Issued: 09/18/1984
• Est. Priority Date: 07/02/1982
• Status: Expired due to Term

• Current Assignee: 3M Company
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Olson, Paul E.
• Primary Examiner(s): Herbert, Thomas J.
• Application Number:
  US06/394,532
• Time in Patent Office: 809 Days
• Field of Search: 428/343, 428/352, 428/421, 428/422, 428/341, 428/355, 428/213, 428/900, 428/332, 428/447, 428/480, 427/387, 427/385.5, 427/412.4, 427/393.5, 560/115, 560/150, 528/70, 156/330
• US Class Current: 428/332
• CPC Class Codes: C08F 220/22 Esters containing halogen
• CPC Class Codes: C08F 222/102 of dialcohols, e.g. ethylene glycol di(meth)acrylate or 1,4-butanediol dimethacrylate
• CPC Class Codes: C08G 65/3322 acyclic
• CPC Class Codes: C09D 171/02 Polyalkylene oxides
• CPC Class Codes: C09D 4/00 Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
• CPC Class Codes: C09J 2427/005 in the release coating
• CPC Class Codes: C09J 2471/005 in the release coating
• CPC Class Codes: C09J 4/00 Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
• CPC Class Codes: C09J 7/401 characterised by the release coating composition
• CPC Class Codes: Y10S 428/90 Magnetic feature
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer
• CPC Class Codes: Y10T 428/2839 with release or antistick coating
• CPC Class Codes: Y10T 428/2891 including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof
• CPC Class Codes: Y10T 428/31544 Addition polymer is perhalogenated
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]

Abstract

Low surface energy liner provided by segments of a perfluoropolyether monomer which has been in-situ polymerized into a cohesive network which is adhered to a substrate. The low surface energy liner is especially useful as a low-adhesion backsize coating for a pressure-sensitive adhesive tape.

Claims

1. A substrate having an adherent, cohesive liner of low surface energy, 5 to 500 nanometers in thickness, prepared from monomer polymerized in situ on said substrate in the form of a coating, and comprising an insoluble addition polymer which comprises a plurality of perfluoropolyether segments of the formula

View Dependent Claims (6)

6. The article of claim 1 wherein said substrate is magnetic recording medium.

2. A pressure-sensitive adhesive tape comprising a flexible web having a pressure-sensitive adhesive layer adherently bonded to one side thereof, and as a low adhesion backsize a liner of low surface energy comprising insoluble polymer of monomer polymerized in situ on the other side of said web in the form of a coating adherently bonded thereto, said polymer comprising perfluoropolyether segments which are a plurality of --C_a F_2a O-- repeating units, where in each such unit the subscript a is an integer of 1 to 4, said segments being at least 75 percent of the weight of said liner.

3. A substrate having a low surface energy liner in the form of a coating on said substrate and comprising a crosslinked polymer insoluble in 1,1,2-trichloro-2,2,1-trifluoroethane at 20°

C., said polymer comprising perfluoropolyether segments which are a plurality of --C_a F_2a O-- repeating units, where in each such units subscript a is an integer from 1 to 4, at least 75 percent of the liner'"'"'s weight being provided by said perfluoropolyether segments.

4. A substrate as defined in claim 3 wherein each said perfluoropolyether segment is

5. A substrate as defined in claim 3 wherein each said segment has a number average molecular weight of 500 to 20,000 and is derived from monomer having said segment, said polymer being an addition polymer formed by polymerizing said monomer in-situ on said substrate.

7. A flexible, plastic substrate having a low surface energy liner in the form of a coating on said substrate and a layer of aggressive poly(dimethylsiloxane) pressure-sensitive adhesive in contact with said liner, said liner comprising an insoluble polymer comprising perfluoropolyether segments which are a plurality of --C_a F_2a O-- repeating units, where in each such units subscript a is an integer from 1 to 4, at least 75 percent of the weight of said liner being provided by said perfluoropolyether segments.

8. The article of claim 7 wherein said substrate is a poly(ethyleneterephthalate) film.

9. A substrate having a liner of low surface energy and a layer of aggressive poly(dimethylsiloxane) pressure-sensitive adhesive coated onto said liner, said liner comprising insoluble polymer of monomer polymerized in-situ on one side of said substrate in the form of a coating adherently bonded thereto, said polymer comprising perfluoropolyether segments which are a plurality of --C_a F_2a O-- repeating units, where in each such unit the subscript a is an integer of 1 to 4, at least 75 percent of the weight of said liner being provided by said perfluoropolyether segments.

10. A substrate as defined in claim 9 wherein said perfluoropolyether segment is

11. Method of making a substrate with a liner, comprising the steps of

(a) providing a dilute solution of a polymerizable monomer having a polymerizable functionality greater than 1 and comprising perfluoropolyether segments which are a plurality of --C_a F_2a O-- repeating units, where in each of such units subscript a is independently an integer from 1 to 4,

(b) coating said solution onto the substrate,

(c) drying the coating, and

(d) polymerizing the monomer in-situ to provide a low surface energy liner in the form of a coating comprising an insoluble polymer having a cohesive network adhered to the substrate,

the amount of said monomer in said solution being such that at least 75 percent of said liner'"'"'s weight is provided by said perfluoropolyether segments.

12. Method as defined in claim 11 wherein said monomer has the formula

13. Method as defined in claim 11 wherein said monomer has a functionality within the range of 1.5 to 2.0.

14. Method as defined in claim 13 wherein said functionality of said monomer is ethylenic unsaturation, and the polymerizing step (d) involves exposing the dried coating to ultraviolet radiation.

15. Method as defined in claim 13 wherein said perfluoropolyether segment is

16. Method as defined in claim 15 wherein said substrate is a flexible plastic film.

17. Method as defined in claim 15 wherein said substrate is a flexible plastic film.

18. Method as defined in claim 15 wherein said substrate is poly(ethyleneterephthalate) film.

19. Method as defined in claim 15 further comprising coating onto said liner of insoluble polymer a solution of poly(dimethylsiloxane) and heating the resulting coating to provide a silicone pressure-sensitive adhesive on said liner.

20. Method as defined in claim 15 wherein said substrate is magnetic recording medium.