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US 4,614,667 AGranted
Composite low surface energy liner of perfluoropolyether
AssigneeMinnesota Mining and Manufacturing Company
InventorsJames M. Larson, Allen L. Noreen
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Abstract
Composite low surface energy liner provided by an inner layer of insoluble polymer made from a polymerizable, film-forming monomer and an outer layer of insoluble polymer made from a polymerizable perfluoropolyether monomer copolymerizable with said film-forming monomer, which layers are in-situ polymerized. The compposite low surface energy liner is especially useful as a low-adhesion backsize coating in a pressure-sensitive adhesive tape.
Claims9
Method of making a substrate with a liner, comprising the steps of
- (a) coating onto the substrate a first dilute solution of polymerizable, film-forming monomer having a polymerizable functionality greater than 1 to provide an inner coating,
- (b) coating over the coating of step (a) a second dilute solution of a polymerizable, film-forming, monomer copolymerizable with the monomer of said first solution and comprising a perfluoropolyether segment which comprises a plurality of --C.sub.a F.sub.2a O-- repeating units, where subscript a in each such unit is independently an integer from 1 to 4, thus providing an outer coating,
- (c) drying said coatings and copolymerizing said momoners.
Dependencies are inferred from the claim text.