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 composite low surface energy liner is especially useful as a low-adhesion backsize coating in a pressure-sensitive adhesive tape.
Claims9
A substrate having a composite liner comprising
- an inner layer of polymer insoluble in methyl ethyl ketone at 20.degree. C. and made from polymerizable, film-forming monomer having a polymerization functionality greater than 1, and
- an outer layer of polymer insoluble in 1,1,2-trichloro-2,2,1-trifluoroethane at 20.degree. C., made from a polymerizable film-forming monomer copolymerizable with the monomer used to make said inner layer, 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.
A substrate having a composite, adherent, cohesive liner having low surface energy, said liner comprising
- an inner layer of polymer insoluble in methyl ethyl ketone at 20.degree. C. and made from film-forming monomer having at least two polymerizable groups, and
- an outer layer of polymer insoluble in 1,1,2-trichloro-2,2,1-trifluoroethane at 20.degree. C., made of film-forming monomer copolymerizable with said monomer of said inner layer, and comprising a perfluoropolyether segment 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 --
- wherein m and n denote randomly distributed repeating units and the ratio m/n is 0.2/1 to 5/1, the number average molecular weight of said segment being 800 to 10,000.
A substrate having an adherent composite liner comprising
- an inner layer of a crosslinked polymer insoluble in methyl ethyl ketone at 20.degree. C. and made from polymerizable, film-forming monomer having a polymerization functionality greater than 1, and
- an outer layer of crosslinked polymer insoluble in 1,1,2-trichloro-2,2,1-trifluoroethane at 20.degree. C. and made from a polymerizable film-forming monomer copolymerizable with the monomer used to make said inner layer 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,
- at least 75 percent of the weight of said outer layer being said perfluoropolyether segments, said layers being in contiguous relationship.
A flexible plastic film having a composite liner and a layer of aggressive poly(dimethylsiloxane) pressure-sensitive adhesive, said liner comprising
- an inner layer of polymer insoluble in methyl ethyl ketone at 20.degree. C. and coated on said film and being made from polymerizable, film-forming monomer having at least two polymerizable groups, and
- an outer layer of polymer insoluble in 1,1,2-trichloro-2,2,1-trifluoroethane at 20.degree. C. and coated on said inner layer and in contact with said adhesive, said outer layer being made from polymerizable film-forming monomer copolymerizable with the monomer used to make said inner layer and comprising a perfluoropolyether segment 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 --
- said segment having a number average molecular weight in the range of 500 to 20,000, at least 75 percent of the weight of said outer layer being said perfluoropolyether segments.
Dependencies are inferred from the claim text.