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US 11,597,183 B2Granted
Profiled films
Assignee3M Innovative Properties Company
InventorsMichael Benton Free, Stephen A. Johnson, William T. Fay, Troy J. Anderson, Derek W. Patzman
Life of this patent
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Abstract
The present disclosure relates to films having at least a first profiled layer and a second layer having an inverse profile of the first layer. Those films can be used as protection tapes for various surfaces. Exemplary uses of the films of the present disclosure include leading edge protection tapes for rotor blades.
Claims9
A film comprising a coextruded stack, wherein the coextruded stack comprises:
- a layer A having a first major surface and a second major surface opposite the first major surface;
- wherein a cross-section profile of the first major surface of the layer A is substantially flat and a cross-section profile of the second major surface of the layer A is non-flat,
- a layer B having a first major surface and a second major surface opposite the first major surface, wherein layer B is selected from the group consisting of from low density polyethylene (LDPE), linear low density polyethylene (LLDPE), homopolymer propylene, ethylene-propylene copolymer, styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene/butylene-styrene block copolymer (SEBS), styrene-ethylene/propylene-styrene (SEPS) block copolymer, and combinations thereof;
- wherein the first major surface of the layer B is immediately adjacent to the second major surface of the layer A,
- wherein a cross-section profile of the second major surface of the layer B is substantially flat,
- wherein the cross-section profile of the first major surface of the layer B is the inverse of the cross-section profile of the second major surface of the layer A,
- wherein the cross-section profile of the second major surface of the layer A has an inner section between a first edge lateral section and a second edge lateral section,
- wherein a maximum thickness of the inner section is Ti, a thickness of the first edge lateral section is T1, and a thickness of the second edge lateral section is T2,
- wherein Ti is greater than each of T1 and T2,
- wherein a ratio Ti/T1 is at least 2:1 and
- wherein the coextruded film has a releasable interface between the layer A and the layer B,
- wherein the layer A comprises a thermoplastic elastomer chosen from thermoplastic polyurethane, aliphatic polyether-based thermoplastic polyurethane, crosslinked polyurethanes, polyureas, and combinations thereof, wherein the thermoplastic elastomer is a principal constituent of the layer A, and
- wherein the coextruded film has a width of at least 50 mm to about 1500 mm.
10 more elements
Dependencies are inferred from the claim text.