EP0098698A2
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EP
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Composite low surface energy liner of perfluoropolyether
Assignee: 3M Co
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Filing: 1983-06-13
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Granted: —
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Expires: 2003-06-13
Abstract
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.
Inventors
- 👤 James M. C/O Minnesota Mining & Manuf.Co. Larson
- 👤 Allen L. C/O Minnesota Mining & Manuf.Co. Noreen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 16:08
CPC Classifications
C; C09; C09J; C09J4/00; C08; C08G; C08G65/00; C08G65/002; C08G65/005; C08G65/007; C08G65/02; C08G65/32; C08G65/329; C09D; C09D171/00; C09D171/02; C09J7/00; C09J7/40; C09J7/401; C09J7/403; C09J2427/00; C09J2427/005; C09J2471/00; C09J2471/005
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
87 words
A substrate having a liner characterized in said liner is a composite liner comprising an inner layer of insoluble polymer made from polymerizable, film-forming monomer having a polymerization functionality greater than 1, and an outer layer of insoluble polymer made from a polymerizable film-forming monomer copolymerizable with the monomer used to make said inner layer and comprising a perfluoropolyether segment whicd comprises a plurality of -C a F 2a O- repeating units, where subscript a is independently in each such unit an integer from 1 to 4.
Claim 2
Dependent Claim
87 words
A substrate having a liner characterized in said liner is a composite liner comprising an inner layer of insoluble polymer made from polymerizable, film-forming monomer having a polymerization functionality greater than 1, and an outer layer of insoluble polymer made from a polymerizable film-forming monomer copolymerizable with the monomer used to make said inner layer and comprising a perfluoropolyether segment whicd comprises a plurality of -C a F 2a O- repeating units, where subscript a is independently in each such unit an integer from 1 to 4.
Claim 3
Dependent Claim
33 words
A substrate as defined in claim 1 further characterized by the feature that said perfluoropolyether segment is wherein m and n denote randomly distributed units, and the ratio m/n is 0.2/1 to 5/1.
Claim 4
Dependent Claim
22 words
A substrate as defined in claim 1 further characterized by the feature that said number average molecular weight is 500 to 20,000.
Claim 5
Dependent Claim
54 words
A substrate as defined in claim 1 in the form of a pressure-sensitive tape comprising a flexible web having a pressure-sensitive adhesive layer adjacent the face of the web opposite to the face carrying said liner, the web being wound upon itself in roll form and said liner serving as a low-adhesion backsize coating.
Claim 6
Dependent Claim
26 words
A substrate as defined in claim 1, further characterized by the feature that the perfluoropolyether segments comprise at least 75% by weight of the outer layer.
Claim 7
Dependent Claim
113 words
A substrate as defined in claim 1 further characterized by the feature that said liner is composite, adherent, cohesive liner having low surface energy, and comprising an inner layer of insoluble polymer made from film-forming monomer having at least two polymerizable groups, and an outer layer of insoluble polymer made of film-forming monomer copolymerizable with said monomer- of said inner layer and comprising a perfluoropolyether segment of the formula -CF 2 0(CF 2 CF 2 0) m (CF 2 0) n CF 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.
Claim 8
Dependent Claim
108 words
Method of making the article of claim 1 characterized by the steps comprising (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 a F 2a O- repeating units, where subscript a is independently in each such unit an integer from 1 to 4, thus providing an outer coating, (c) drying said coatings and polymerizing said monomers.
Claim 9
Dependent Claim
30 words
Method as defined in claim 7 further characterized by the feature that said coating step (a) is followed by drying to provide a dry inner coating before coating step (b).
Claim 10
Dependent Claim
22 words
Method as defined in claim 8 further characterized by the feature that the inner coating is partially polymerized before coating step (b).
Claim 11
Dependent Claim
20 words
Method as defined in claim 7 furtber characterized by the feature that coating steps (a) and (b) are essentially simultaneous.
Claim 12
Dependent Claim
24 words
Method as defined in claim 7 further characterized by the feature that the perfluoropolyether monomer has acryloyl groups and step (c) involves ultraviolet irradiation.
Claim 13
Dependent Claim
21 words
Method as defined in claim 11 further characterized by the feature that the irradiation is carried out in an inert atmosphere.
Claim 14
Dependent Claim
39 words
Method as defined in claim 7 further characterized by the feature that at least one part of the polyethylenically-unsaturated monomer is coated out in step (a) per one part by weight of the perfluoropolyether coated out in step (b).
Claim 15
Dependent Claim
22 words
Method as defined in claim 7 further characterized by the feature that the perfluoropolyether monomer has a functionality of 1.5 to 2.0.
Claim 16
Dependent Claim
65 words
Method as defined in claim 7 further characterized by the feature that said polyfluoropolyether monomer has the formula wherein Q comprises a polymerizable functional group attached to a chain of k randomly connected -C a F 2a O- units, where subscript a is independently in each such unit an integer of 1 to 4, and Z is -OC a F 2a + l or Q.
References Cited (Backward Citations)
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