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US3570748A
Expired / Lapsed
US
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Composite film and method
Assignee: Standard Packaging Corp
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Filing: 1966-06-29
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Granted: 1971-03-16
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Expires: 1986-06-29
Abstract
Abstract A laminated film is formed by extrusion coating a film-forming synthetic linear polyamide in a thin film onto a polyolefin film. The polyolefin surface is subjected to oxidative influence prior to coating, and adhesive primers may be used. One embodiment of the film includes a saran layer, preferably intermediate the synthetic linear polyamide and polyolefin.
Inventors
- 👤 James Warren Coyle
- 👤 Louis John Marsella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:38
CPC Classifications
B; B32; B32B; B32B38/00; B32B38/0008; B32B27/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
28 words
The composite film structure of claim 1, wherein the intermediate adhesion-promoting primer is a polyalkylene imine comprised of alkylene units containing from 2 to about 4 carbon atoms.
Claim 2
Dependent Claim
47 words
The composite film structures of claim 1, wherein a film of a saran material selected from the group consisting of copolymers of vinylidene chloride and acrylonitrile and copolymers of vinylidene chloride and vinyl chloride, is provided intermediate the primer layer and the layer of synthetic linear polyamide.
Claim 3
Dependent Claim
11 words
The composite of claim 1, wherein the polyolefin substrate is polyethylene.
Claim 4
Dependent Claim
12 words
The composite of claim 2, wherein the polyalkylene imine is polyethylene imine.
Claim 5
Dependent Claim
16 words
The composite film structure of claim 1, wherein the intermediate adhesion-promoting primer is a urethane-based primer.
Claim 6
Dependent Claim
19 words
The composite film structure of claim 1, wherein the intermediate adhesion-promoting primer is a dibutyl tin dilaurate-catalyzed urethane prepolymer.
Claim 7
Dependent Claim
134 words
A composite film structure comprising, in tightly joined lamination; a. a substrate layer of a polyolefin having one surface thereof treated by subjecting it to oxidative influences to increase the free surface energy thereof as measured by an increase in wettability tO water, the treated surface of the substrate layer being uniformly coated with; b. an intermediate adhesion-promoting primer layer of a polyalkylene imine comprised of alkylene units containing from 2 to about 4 carbon atoms, the exposed surface of the polyalkylene imine layer being oxidized; and c. a tightly adhering layer over the oxidized surface of the polyalkylene imine of a film-forming synthetic linear polyamide, the polyamide layer having been joined to the film structure by extrusion coating the polyamide in molten form onto a film of the polyolefin bearing the primer layer.
Claim 8
Dependent Claim
11 words
The composite of claim 8, wherein the polyolefin substrate is polyethylene.
Claim 9
Dependent Claim
11 words
The composite of claim 8, wherein the polyolefin substrate is polypropylene.
Claim 10
Dependent Claim
12 words
The composite of claim 8, wherein the polyalkylene imine is polyethylene imine.
Claim 11
Dependent Claim
23 words
The composite of claim 8, wherein the surfaces of the substrate and of the polyalkylene imine layer are subjected to electrostatic discharge treatment.
Claim 12
Dependent Claim
40 words
The composite of claim 8, wherein the film-forming synthetic linear polyamide is selected from the group consisting of nylon-type 6, nylon-type 6/6, , copolymers of nylon-type 6 and nylon-type 6/6, and terpolymers of nylon-type 6, nylon-type 6/6 and nylon-type 6/10.
Claim 13
Dependent Claim
202 words
A composite film structure comprising, in tightly joined lamination: a. a substrate layer of a polyolefin having one surface thereof treated by subjecting it to oxidative influences to increase the free surface energy thereof as measured by an increase in wettability to water, the treated surface of the substrate layer being uniformly coated with; b. an intermediate adhesion-promoting primer layer of a polyalkylene imine comprised of alkylene units containing from 2 to about 4 carbon atoms, the exposed surface of the polyalkylene imine layer being treated by subjecting it to oxidative influences; c. a tightly adhering layer over the treated surface of the polyalkylene imine of a film-forming synthetic linear polyamide, the exposed surface of the synthetic linear polyamide being treated as in (a), the treated synthetic linear polyamide surface being uniformly coated in turn with; d. a second adhesion-promoting primer layer; and e. a coating over the second primer layer, of saran material selected from the group consisting of copolymers of vinylidene chloride and acrylonitrile and copolymers of vinylidene chloride and vinyl chloride; the polyamide layer having been joined to the film structure by extrusion coating the polyamide in molten form onto a film of the polyolefin bearing the primer layer.
Claim 14
Dependent Claim
19 words
The composite film structure of claim 14, wherein the saran material is a copolymer of vinylidene chloride and acrylonitrile.
Claim 15
Dependent Claim
20 words
The composite film structure of claim 14, wherein the saran material is a copolymer of vinylidene chloride and vinyl chloride.
Claim 16
Dependent Claim
161 words
A composite film structure comprising, in tightly joined lamination; a. a substrate layer of polyethylene having a thickness between about 0.8 mil and about 3 mils, and having one surface thereof treated with electrostatic discharge to render it more receptive to adherent coatings, the treated surface of the substrate layer being uniformly coated with; b. an intermediate adhesion-promoting primer layer of between about 2 and about 30 grams per thousand square feet of substrate surface of polyalkylene imine comprised of alkylene units containing from 2 to about 4 carbon atoms, the exposed surface of the polyalkylene imine layer being treated with electrostatic discharge; and c. a tightly adhering layer over the treated surface of the polyalkylene imine of a film-forming synthetic linear polyamide having a thickness between about 0.1 and about 1.5 mils; the polyamide layer having been joined to the film structure by extrusion coating the polyamide in molten form onto a film of the polyethyLene bearing the primer layer.
Claim 17
Dependent Claim
178 words
A composite film structure comprising, in tightly joined lamination: a. a substrate layer of polyethylene having a thickness between about 0.8 mil and about 3 mils, and having one surface thereof treated with electrostatic discharge to render it more receptive to adherent coatings, the treated surface of the substrate layer being uniformly coated with; b. an intermediate adhesion-promoting primer layer of between about 10 and about 30 grams per thousand square feet of substrate surface of a urethane based primer; c. a coating of saran material selected from the group consisting of copolymers of vinylidene chloride and acrylonitrile and copolymers of vinylidene chloride and vinyl chloride over the primer layer; d. a second adhesion-promoting primer layer of a urethane based primer; e. a tightly adhering layer over the treated surface of the polyalkylene imine of a film-forming synthetic linear polyamide having a thickness between about 0.1 and about 1.5 mils; the polyamide layer having been joined to the film structure by extrusion coating the polyamide in molten form onto a film of the polyethylene bearing the primer layer.
Claim 18
Dependent Claim
19 words
The composite film structure of claim 18, wherein the urethane based primer is a dibutyl tin dilaurate-catalyzed urethane prepolymer.
Claim 19
Dependent Claim
17 words
The composite of claim 18, wherein the saran material is a copolymer of vinylidene chloride and acrylonitrile.
Claim 20
Dependent Claim
25 words
The composite of claim 18, wherein the synthetic linear polyamide portion has a moisture content in the approximate range of 1.5 percent to 4 percent.
Claim 21
Dependent Claim
237 words
A composite film structure comprising, in tightly joined lamination: a. a substrate layer of polyethylene having a thickness between about 0.8 and about 3 mils, and having one surface thereof treated with electrostatic discharge to render it more receptive to adherent coatings, the treated surface of the substrate layer being uniformly coated with; b. an intermediate adhesion-promoting primer layer of between about 2 and about 30 grams per thousand square feet of substrate surface of polyalkylene imine comprised of alkylene units containing from 2 to about 4 carbon atoms, the exposed surface of the polyalkylene imine layer being treated with electrostatic discharge; c. a tightly adhering layer over the treated surface of the polyalkylene imine of a film-forming synthetic linear polyamide having a thickness between about 0.1 and about 1.5 mils, the exposed surface of the synthetic linear polyamide being treated with electrostatic discharge and being uniformly coated with; d. a second adhesion promoting layer of polyalkylene imine; and e. a coating on the second polyalkylene imine layer of a saran material selected from the group consisting of copolymers of vinylidene chloride and acrylonitrile and copolymers of vinylidene chloride and vinyl chloride in an amount between about 1/3 and about 1 pound per thousand square feet of substrate surface; the polyamide layer having been joined to the film structure by extrusion coating the polyamide in molten form onto a film of the polyethylene bearing the primer layer.
Claim 22
Dependent Claim
144 words
A package comprising a sheet of a composite film structure comprising, in tightly joined lamination: a. a substrate layer of a polyolefin having one surface thereof treated by subjecting it to oxidative influences to increase the free surface energy thereof as measured by an increase in wettability to water, the treated surface of the substrate layer being uniformly coated with; b. an intermediate adhesion-promoting primer layer; and c. a tightly adhering layer over the primer layer of a film-forming synthetic linear polyamide, the polyamide layer having been joined to the film structure by extrusion coating the polyamide in molten form onto a film of the polyolefin bearing the primer layer; the sheet being folded to bring two polyolefin surfaces together along one edge of the sheet and the sheet being joined at the edge by a heat seal along at least a portion thereof.
Claim 23
Dependent Claim
30 words
The package of claim 23, wherein the fold of the sheet forms one edge and the remaining edges are closed by a heat seal to form a hermetically sealed package.
Claim 24
Dependent Claim
138 words
A package comprising a sheet of composite film structure comprising, in tightly joined lamination; a. a substrate layer of a polyolefin, one surface of which has been treated by subjecting it to oxidative influences to increase the free surface energy thereof as measured in an increase to wettability to water; b. an intermediate primer layer of a urethane based primer; and c. a tightly adhering layer over the primer layer of a film-forming synthetic linear polyamide, the polyamide layer having been joined to the film structure by extrusion coating the polyamide in molten form onto a film of the polyolefin bearing the primer layer; the sheet being folded to bring two polyolefin surfaces together along one edge of the sheet and the sheet being joined at the edge by a heat seal along at least a portion thereof.
Claim 25
Independent Claim
105 words
The method for preparing a composite film structure comprising the steps of: a. treating one surface of a substrate of polyolefin film by subjecting it to oxidative influences to increase the free surface energy thereof as measured by an increase in wettability to water; b. applying to the treated surface of the substrate film an adhesion-promoting primer layer; c. treating the exposed surface of the primer as in (a); d. depositing a melt extruded layer of a normally solid film-forming synthetic linear polyamide in molten form over the treated surface of the primer layer; and e. cooling the laminate thus formed to a normal temperature.
Claim 26
Dependent Claim
34 words
The method of claim 26, synthetic linear polyamide wherein the surface of the composite following step (d) is heated to catalyze the growth of crystals in the synthetic linear polyamide portion of the composite.
Claim 27
Independent Claim
108 words
A method for preparing a composite film structure comprising the steps of: a. subjecting one surface of a substrate of polyolefin film to electrostatic discharge; b. applying to the treated surface of the substrate film an adhesion-promoting primer layer; c. subjecting the exposed surface of the primer layer to electrostatic discharge; d. depositing a melt extruded layer of a normally solid film-forming synthetic linear polyamide in molten form over the treated surface of the primer layer; e. adjusting the moisture content of the synthetic linear polyamide to within the range of about 1.5 to about 4 percent; and f. cooling the laminate thus formed to a normal temperature.
Claim 28
Independent Claim
125 words
A method for preparing a composite film structure comprising the steps of: a. subjecting one surface of a substrate of polyolefin film to electrostatic discharge; b. applying to the treated surface of the substrate film an adhesion-promoting primer layer; c. subjecting the exposed surface of the primer layer to electrostatic discharge; d. depositing a melt extruded layer of a normally solid film-forming synthetic linear polyamide in molten form over the treated surface of the primer layer; e. subjecting the exposed synthetic linear polyamide surface to electrostatic discharge; f. applying to an adhesion-promoting primer layer to the treated nylon surface; g. applying a coating of saran to the electrostatic discharge treated synthetic linear polyamide surface; and h. cooling the laminate thus formed to a normal temperature.
Claim 29
Dependent Claim
17 words
The method of claim 29, wherein the adhesion-promoting primer layer is a dibutyl tin dilaurate-catalyzed urethane prepolymer.
Claim 30
Independent Claim
137 words
A method for preparing a composite film structure comprising the steps of: a. treating one surface of a substrate of a polyolefin film having a thickness between about 0.8 and about 3 mils with electrOstatic discharge; b. applying to the treated substrate surface between about 2 and about 30 grams per thousand square feet of substrate surface of a polyalkylene imine comprised of alkylene units containing from 2 to about 4 carbon atoms as an adhesion-promoting primer coating; c. treating the exposed surface of the polyalkylene imine coating with electrostatic discharge; d. depositing a melt extruded layer of a normally solid film-forming synthetic linear polyamide in molten form having a thickness between about 0.1 and about 1.5 mils over the electrostatic discharge treated polyalkylene imine layer; and e. cooling the laminate thus formed to a normal temperature.
Claim 31
Dependent Claim
12 words
The method of claim 31, wherein the polyolefin substrate film is polyethylene.
Claim 32
Dependent Claim
12 words
The method of claim 31, wherein the polyalkylene imine is polyethylene imine.
Claim 33
Dependent Claim
35 words
The method of claim 31, including the step of adjusting the moisture content of the synthetic linear polyamide portion of the composite to a value within the approximate range of 1.5 percent to 4 percent.
Claim 34
Dependent Claim
17 words
The method of claim 34, wherein the saran material is a copolymer of vinylidene chloride and acrylonitrile.
Claim 35
Dependent Claim
34 words
The method of claim 34, including the step of adjusting the moisture content of synthetic linear polyamide portion of the composite to a value within the approximate range of 1.5 percent to 4 percent.
Claim 36
Dependent Claim
31 words
The method of claim 34, wherein the exposed synthetic linear polyamide surface is subjected to heat to catalyze the growth of crystals in the synthetic linear polyamide portions of the composite.
Claim 37
Independent Claim
89 words
A method for preparing a composite film structure comprising the steps of: a. treating one surface of a substrate of polyolefin film by subjecting it to oxidative influences to increase the free surface energy thereof as measured by an increase in wettability to water; b. applying to the treated surface of the substrate film an adhesion-promoting primer layer; c. depositing a melt extruded layer of a normally solid film forming nylon in molten form over the primer layer; and d. cooling the laminate thus formed to a normal temperature.
Claim 38
Independent Claim
123 words
A method for preparing a package comprising the steps of: a. treating one surface of a substrate of polyolefin film by subjecting it to oxidative influences to increase the free surface energy thereof as measured by an increase in wettability to water; b. applying to the treated surface of the substrate film an adhesion-promoting primer layer; c. depositing a melt extruded layer of a normally solid film-forming synthetic linear polyamide in molten form over the primer layer; d. cooling the laminate thus formed to a normal temperature; e. folding the laminate to bring two polyolefin surfaces together along at least one edge of the laminate; and f. joining the laminate at the edge by a heat seal along at least a portion thereof.
Claim 39
Independent Claim
150 words
A method for preparing a composite film structure comprising the steps of: a. treating one surface of a substrate of a polyolefin film having a thickness between about 0.8 and about 3 mils with oxidative influences; b. applying to the treated substrate surface between about 10 and about 30 grams per thousand square feet of substrate surface a urethane based primer; c. applying a coating of a saran material selected from the group consisting of copolymers of vinylidene chloride and acrylonitrile and copolymers of vinylidene chloride and vinyl chloride, over the primer layer; d. applying a second primer layer of urethane based primer to the exposed surface of saran material; and e. depositing a melt extruded layer of normally solid film forming synthetic linear polyamide in molten form having a thickness between about 0.1 and about 1.5 mils over the exposed adhesive surface; and f. cooling the laminate thus formed.
Claim 40
Dependent Claim
14 words
The method of claim 40 whereiN the primer is dibutyl tin dilaurate-catalyzed urethane prepolymer.
Claim 41
Independent Claim
95 words
The method for preparing a composite film structure comprising the steps of: a. treating one surface of a substrate of polyolefin film by subjecting it to oxidative influences to increase the free surface energy thereof as measured by an increase in wettability to water; b. applying a urethane based primer to the treated surface of the substrate film; c. depositing a melt extruded layer of a normally solid film forming synthetic linear polyamide in molten form over the treated surface of the primer layer; and d. cooling the laminate thus formed to a normal temperature.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |