Multi-layer sealing films
First Claim
1. A retroreflective article, comprising:
- a plurality of cube corner elements; and
a multi-layer sealing film at least a portion of which is adhered to at least some of the plurality of cube corner elements such that the multi-layer sealing film maintains an air interface between the cube corner elements and the multi-layer sealing film, wherein the multi-layer sealing film includes;
a first sealing film layer comprising a thermoplastic polymeric material including reaction products of alkylene in an amount of at least about 50% by weight and reaction products of at least one non-acidic comonomer in an amount of less than about 25% by weight; and
a second sealing film layer including at least one of a polypropylene and high density polyethylene;
wherein at least one of the first sealing film layer and the second sealing film layer has an elastic modulus that is between about 3.5×
105 kPa and about 50×
105 kPa, and wherein the flexural rigidity of the retroreflective article is between about 1.0×
10−
8 N·
m2 and about 4.0×
10−
8 N·
m2.
1 Assignment
0 Petitions
Accused Products
Abstract
The present application generally relates to multi-layer sealing films, methods of making such films, materials for inclusion in such films, retroreflective sheeting and articles including such films, and methods of making retroreflective sheeting and articles including such films. The multi-layer sealing film may include two or more layers. One exemplary embodiment of a two-layer film includes a first layer including a thermoplastic polymeric material including reaction products of alkylene and reaction products of at least one non-acidic comonomer and a second layer including one of a polyolefin, a polyester, a polymethyl methacrylate, a polyamide, a polycarbonate, an ethylene-methacrylic acid, and a polyurethane. In some embodiments, at least one of the layers of the multi-layer sealing film has an elastic modulus of at least 3.5×105 kPa and the flexural rigidity of the retroreflective article is less than about 4.0×10−8 N·m2.
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Citations
16 Claims
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1. A retroreflective article, comprising:
-
a plurality of cube corner elements; and a multi-layer sealing film at least a portion of which is adhered to at least some of the plurality of cube corner elements such that the multi-layer sealing film maintains an air interface between the cube corner elements and the multi-layer sealing film, wherein the multi-layer sealing film includes; a first sealing film layer comprising a thermoplastic polymeric material including reaction products of alkylene in an amount of at least about 50% by weight and reaction products of at least one non-acidic comonomer in an amount of less than about 25% by weight; and a second sealing film layer including at least one of a polypropylene and high density polyethylene;
wherein at least one of the first sealing film layer and the second sealing film layer has an elastic modulus that is between about 3.5×
105 kPa and about 50×
105 kPa, and wherein the flexural rigidity of the retroreflective article is between about 1.0×
10−
8 N·
m2 and about 4.0×
10−
8 N·
m2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A multi-layer sealing film, comprising:
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a first sealing film layer comprising a thermoplastic polymeric material including reaction products of alkylene in an amount of at least about 50% by weight and reaction products of at least one non-acidic comonomer in an amount of less than 25% by weight; and a second sealing film layer including at least one of a polypropylene and high density polyethylene; wherein at least one of the first sealing film layer and the second sealing film layer has an elastic modulus that is between about 3.5×
105 kPa and about 50×
105 kPa, and wherein the multi-layer sealing film is configured to impart a flexural rigidity between about 1.0×
10−
8 N·
m2 and about 4.0×
10−
8 N·
m2 to a retroreflective article comprising the multi-layer sealing film. - View Dependent Claims (15, 16)
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Specification