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US 6,521,312 B1Granted
Multilayered film structures and methods of making and using the same
AssigneeLoparex, Inc.
InventorLeRoy Herbert Keiser
Life of this patent
Estimating the term…
Abstract
Cost effective film laminates having desirable stiffness and processes for making the same are disclosed. The laminates include outer layers formed from one or more films having superior flexural modulus properties sandwiching a thicker yet less stiff polyolefin layer. The multilayered structures are suitable for use in applications which typically require a single heavy gauge film having a high degree of stiffness, such as release liners and the like.
Claims25
A multilayer structure comprising:
- (a) first and second outer film layers, each comprising at least one thermoplastic polymer, each of said first and second outer film layers defining a thickness and further having a flexural modulus value exceeding 1500 MN/m2;
- and
- (b) an intermediate layer comprising at least one unoriented olefinic polymer disposed between and bonding said first and second outer film layers to form a unitary multilayer composite structure, said intermediate layer having a flexural modulus value which is less than the flexural modulus value of each of said first and second outer film layers and a thickness that is greater than the thickness of either of the first and second outer film layers,
- said unitary multilayer structure having an adhesion strength between said intermediate layer and said first and second outer film layers that is greater than the cohesive strength of at least one of said first, second, and intermediate layers, said unitary multilayer structure further having a flexural modulus value greater than the flexural modulus value of said intermediate layer.
1 more element
A release liner comprising:
- a multilayer structure comprising (a) first and second film layers, each comprising at least one thermoplastic polymer, each of said first and second film layers defining a thickness and further having a flexural modulus value exceeding 1500 MN/m2;
- and (b) an intermediate layer comprising at least one unoriented olefinic polymer disposed between and bonding said first and second film layers to form a unitary multilayer composite structure, said intermediate layer having a flexural modulus value which is less than the flexural modulus value of each of said first and second layers and a thickness that is greater than the thickness of either of the first and second film layers, said unitary multilayer structure having an adhesion strength between said intermediate layer and said first and second film layers that is greater than the cohesive strength of at least one of said first, second, and intermediate layers, said unitary multilayer structure further having a flexural modulus value greater than the flexural modulus value of said intermediate layer;
- and
- a release coating on at least one outer surface of said multilayer structure.
1 more element
A label comprising:
- a release liner comprising (a) first and second film layers, each comprising at least one thermoplastic polymer, each of said first and second film layers defining a thickness and further having a flexural modulus value exceeding 1500 MN/m2;
- and (b) an intermediate layer comprising at least one unoriented olefinic polymer disposed between and bonding said first and second film layers to form a unitary multilayer composite structure, said intermediate layer having a flexural modulus value which is less than the flexural modulus value of each of said first and second layers and a thickness that is greater than the thickness of either of the first and second film layers, said unitary multilayer structure having an adhesion strength between said intermediate layer and said first and second film layers that is greater than the cohesive strength of at least one of said first, second, and intermediate layers, said unitary multilayer structure further having a flexural modulus value greater than the flexural modulus value of said intermediate layer;
- a release coating on at least one outer surface of said multilayer structure;
- and
- a third film layer adjacent an outer surface of said release coating and having an outer surface opposite said release coating that is rendered receptive to receipt of printed indicia and an inner surface adjacent said release coating that further comprises a pressure sensitive adhesive.
2 more elements
A colored multilayer structure comprising:
- (a) first and second outer layers, each comprising at least one thermoplastic polymer, each of said first and second outer film layers defining a thickness and further having a flexural modulus value exceeding 1500 MN/m2;
- and
- (b) an intermediate layer comprises a pigment and formed of at least one unoriented olefinic polymer disposed between and bonding said first and second outer film layers to form a unitary multilayer composite structure, said intermediate layer having a flexural modulus value which is less than the flexural modulus value of each of said first and second outer film layers and a thickness that is greater than the thickness of either of the first and second outer film layers,
- said unitary multilayer structure having an adhesion strength between said intermediate layer and said first and second outer film layers that is greater than the cohesive strength of at least one of said first, second, and intermediate layers, said unitary multilayer structure further having a flexural modulus value greater than the flexural modulus value of said intermediate layer.
1 more element
A photographic print substrate comprising:
- a multilayer structure of (a) first and second film layers, each comprising at least one thermoplastic polymer, each of said first and second film layers defining a thickness and further having a flexural modulus value exceeding 1500 MN/m2;
- and (b) an intermediate layer comprising at least one unoriented olefinic polymer disposed between and bonding said first and second film layers to form a unitary multilayer composite structure, said intermediate layer having a flexural modulus value which is less than the flexural modulus value of each of said first and second layers and a thickness that is greater than the thickness of either of the first and second film layers, said unitary multilayer structure having an adhesion strength between said intermediate layer and said first and second film layers that is greater than the cohesive strength of at least one of said first, second, and intermediate layers, said unitary multilayer structure further having a flexural modulus value greater than the flexural modulus value of said intermediate layer;
- and
- at least one gelatin sub layer and a photographic emulsion layer on at least one outer surface of said multilayer composite structure.
1 more element
Dependencies are inferred from the claim text.