US3874971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated article of metallic, polymeric and wax impregnated cellulosic layers and method of preparation
Assignee: Sun Research and Development Co
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Filing: 1972-08-31
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Granted: 1975-04-01
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Expires: 1992-08-31
Abstract
Abstract A tri-layer laminated article, having an outer wax impregnated cellulosic layer, a middle thermoplastic polymeric layer and an outer metallic layer, is easily prepared by applying a dispersion of solid polymer particles in molten wax to the surface of at least one of the outer layers and then placing the other outer layer adjacent to the dispersion. After the application of heat and pressure to the resulting composite, the cellulosic layer is impregnated with wax and the polymer is a molten middle layer. The latter upon cooling, solidifies resulting in the metallic layer firmly adhering to the solid polymeric layer which is firmly adhering to the wax impregnated cellulosic layer. The polymer used must be substantially insoluble in the molten wax at a temperature below the melting point of the polymer and have an adhesive capacity for both metallic and cellulosic materials. The resulting article has utility as a packaging material.
Inventors
- 👤 Ernest P Black
- 👤 Irl N Duling
- 👤 Jr John C Merges
- 👤 Alfred F Talbot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:05
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B2311/00; B32B2311/02; B32B2311/04; B32B2311/08; B32B2311/14; B32B2311/16; B32B2311/24; B32B2311/30; B32B2325/00; B32B2327/00; B32B2327/06; B32B2369/00; B32B2377/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31685; Y10T428/31692; Y10T428/31699; Y10T428/31714; Y10T428/31725; Y10T428/31739; Y10T428/31801
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
212 words
METHOD OF PREPARING A TRI-LAYER LAMINATED ARTICLE, HAVING AN OUTER WAX-IMPREGNATED CELLULOSIC LAYER, A MIDDLE THERMOPLASTIC POLYMERIC LAYER AND AN OUTER METALLIC LAYER, COMPRISING: A. ESTABLISHING A HETEROGENEOUS COMPOSITE OF THERMOPLASTIC POLYMER IN FINELY DIVIDED FORM AND MOLTEN WAX, SAID POLYMER HAVING AN ADHESIVE CAPACITY FOR BOTH METALLIC AND CELLULOSIC MATERIALS AND A MELTING POINT ABOVE THE MELTING POINT OF THE WAX AND BEING SUBSTANTIALLY INSOLUBLE IN MOLTEN WAX AT A TEMPERATURE BELOW THE MELTING POINT OF THE POLYMER, B. APPLYING A COATING OF SAID HETEROGENEOUS COMPOSITE TO AN INNER SURFACE OF AN OUTER METALLIC LAYER AT A TEMPERATURE ABOVE THE MELTING POINT OF WAX BUT BELOW THE MELTING POINT OF THE POLYMER, THE AMOUNT OF COATING BEING REGULATED SO THAT SUBSTANTIALLY ALL OF THE WAX THEREIN IS ABSORBABLE IN THE CELLULOSIC LAYER, C. PLACING THE OTHER OUTER CELLULOSIC LAYER ADJACENT SAID COATING AND ALLOWING SUFFICIENT TIME TO PERMIT THE WAX TO START TO ABSORB INTO SAID CELLULOSIC LAYER AND THEN, D. HEATING THE COATING TO A TEMPERATURE ABOVE THE MELTING POINT OF THE POLYMER AND PRESSING THE OUTER LAYERS AGAINST THE COATING TO FORM AN ESSENTIALLY CONTINUOUS MOLTEN POLYMER LAYER BETWEEN THE METALLIC LAYER AND CELLULOSIC LAYER, E. AND THEREAFTER COOLING THE MOLTEN POLYMER WHEREBY IT SOLIDIFIES RESULTING IN SAID ARTICLE.
Claim 2
Dependent Claim
212 words
METHOD OF PREPARING A TRI-LAYER LAMINATED ARTICLE, HAVING AN OUTER WAX-IMPREGNATED CELLULOSIC LAYER, A MIDDLE THERMOPLASTIC POLYMERIC LAYER AND AN OUTER METALLIC LAYER, COMPRISING: A. ESTABLISHING A HETEROGENEOUS COMPOSITE OF THERMOPLASTIC POLYMER IN FINELY DIVIDED FORM AND MOLTEN WAX, SAID POLYMER HAVING AN ADHESIVE CAPACITY FOR BOTH METALLIC AND CELLULOSIC MATERIALS AND A MELTING POINT ABOVE THE MELTING POINT OF THE WAX AND BEING SUBSTANTIALLY INSOLUBLE IN MOLTEN WAX AT A TEMPERATURE BELOW THE MELTING POINT OF THE POLYMER, B. APPLYING A COATING OF SAID HETEROGENEOUS COMPOSITE TO AN INNER SURFACE OF AN OUTER METALLIC LAYER AT A TEMPERATURE ABOVE THE MELTING POINT OF WAX BUT BELOW THE MELTING POINT OF THE POLYMER, THE AMOUNT OF COATING BEING REGULATED SO THAT SUBSTANTIALLY ALL OF THE WAX THEREIN IS ABSORBABLE IN THE CELLULOSIC LAYER, C. PLACING THE OTHER OUTER CELLULOSIC LAYER ADJACENT SAID COATING AND ALLOWING SUFFICIENT TIME TO PERMIT THE WAX TO START TO ABSORB INTO SAID CELLULOSIC LAYER AND THEN, D. HEATING THE COATING TO A TEMPERATURE ABOVE THE MELTING POINT OF THE POLYMER AND PRESSING THE OUTER LAYERS AGAINST THE COATING TO FORM AN ESSENTIALLY CONTINUOUS MOLTEN POLYMER LAYER BETWEEN THE METALLIC LAYER AND CELLULOSIC LAYER, E. AND THEREAFTER COOLING THE MOLTEN POLYMER WHEREBY IT SOLIDIFIES RESULTING IN SAID ARTICLE.
Claim 3
Dependent Claim
31 words
A method according to claim 1 wherein said heterogeneous composite contains 5 to 45 parts by weight of finely divided polymer and 55 to 95 parts by weight of said wax.
Claim 4
Dependent Claim
20 words
A method according to claim 2 wherein all the finely divided polymer is finer than 100 mesh (U.S. Sieve Series).
Claim 5
Dependent Claim
34 words
A method according to claim 3 wherein the polymer is selected from the following group: polyamide, polyvinylchloride, cellulose acetate butyrate, polymethylmethacrylate, polyethylene with a molecular weight in excess of 1 million, polycarbonate and polystyrene.
Claim 6
Dependent Claim
25 words
A method according to claim 4 wherein the metallic layer is selected from the following group: aluminum, steel, tin, lead, silver, gold and tin-lead alloy.
Claim 7
Dependent Claim
22 words
A method according to claim 5 wherein the polymer is selected from the following group: polyamide, polyvinylchloride, cellulose acetate butyrate and polymethylmethacrylate.
Claim 8
Dependent Claim
13 words
A method according to claim 1 wherein the wax is a petroleum wax.
Claim 9
Dependent Claim
22 words
A method according to claim 7 wherein the polymer is selected from the following group: polyamide, polyvinylchloride, cellulose acetate butyrate and polymethylmethacrylate.
Claim 10
Dependent Claim
68 words
A method according to claim 8 wherein said heterogeneous composite contains 10 to 40 parts by weight of finely divided polymer and 60 to 90 parts by weight of said wax, all the finely divided polymer is finer than 100 mesh (U.S. Sieve Series), said polymer is selected from the following group: nylon-11 nylon-6,6, nylon-6,10, and said metallic layer is selected from the following group: aluminum and steel.
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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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |