Low surface energy liner of perfluoropolyether

Claim 2

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 --CF.sub.2 O(CF.sub.2 CF.sub.2 O).sub.m (CF.sub.2 O).sub.n CF.sub.2 -- where m and n denote randomly distributed repeating units and the ratio m/n is 0.2/1 to 5/1, each said segment having a number average molecular weight of 800 to 10,000, said segments being at least 75 percent of the weight of said liner.

Claim 3

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.

Claim 4

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.

Claim 5

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.

Claim 6

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.

Claim 7

A substrate as defined in claim 3 wherein each said perfluoropolyether segment is --CF.sub.2 O(CF.sub.2 CF.sub.2 O).sub.m (CF.sub.2 O).sub.n CF.sub.2 -- wherein m and n denote randomly distributed repeating units and the ratio m/n is 0.2/1 to 5/1.

Claim 8

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.

Claim 9

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

Claim 10

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.

Claim 11

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.

Claim 12

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

Claim 13

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.

Claim 14

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.

Claim 15

A substrate as defined in claim 9 wherein said perfluoropolyether segment is --CF.sub.2 O(CF.sub.2 CF.sub.2 O).sub.m (CF.sub.2 O).sub.n CF.sub.2 -- wherein m and n denote randomly distributed repeating units and the ratio m/n is 0.2/1 to 5/1.

Claim 16

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.

Claim 17

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.

Claim 18

Method as defined in claim 11 wherein said monomer has the formula Q--(C.sub.a F.sub.2a O).sub.k C.sub.a F.sub.2a --Z wherein Q comprises a polymerizable group attached to a chain of k randomly distributed --C a F 2a O-- repeating units, in each of which subscript a is independently an integer of 1 to 4, and Z is --OC a F 2a+1 or Q.

Claim 19

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

Claim 20

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.

Claim 21

Method as defined in claim 13 wherein said perfluoropolyether segment is --CF.sub.2 O(CF.sub.2 CF.sub.2 O).sub.m (CF.sub.2 O).sub.n CF.sub.2 -- wherein m and n denote randomly distributed repeating units, the ratio m/n is 0.2/1 to 5/1, and wherein said monomer has a plurality of acryloyl groups.

Claim 22

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

Claim 23

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

Claim 24

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

Claim 25

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.

Claim 26

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