Low surface energy liner of perfluoropolyether
AssigneeMinnesota Mining and Manufacturing Company
InventorPaul E. Olson
Life of this patent
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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.
Claims20
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.
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.sub.a F.sub.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.
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.degree. C., said polymer comprising perfluoropolyether segments which are a plurality of --C.sub.a F.sub.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.
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.sub.a F.sub.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.
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.sub.a F.sub.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.
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.sub.a F.sub.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.
Dependencies are inferred from the claim text.