US5059460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated metal sheet
Assignee: Crown Packaging Technology Inc
•
Filing: 1988-10-12
•
Granted: 1991-10-22
•
Expires: 2008-10-12
Abstract
Abstract A process for producing by simultaneous lamination a polymer/metal/polymer laminate, which process comprises (i) simultaneously laminating to each of the major surfaces of a metal sheet a composite polyester film (A) comprising an inner layer (A1) of a substantially non-crystalline linear polyester having a softening point (Ts-A1) below 200° C. and a melting point (Tm-A1) above 150° C. and below 250° C. and an outer layer (A2) of a biaxially oriented linear polyester having a crystallinity greater than 30% and having a melting point (Tm-A2) above 250° C., the metal sheet having been heated to a temperature T 1 above the softening point (Ts-A1), preferably above the melting point (Tm-A1), of the polyester of inner layer (A1) thereby to cause softening, preferably melting, of the inner layers (A1) and adhesion thereof to the metal sheet, but below the temperature (Tm-A2) at which the outer surface of the outer layer (A2) will melt when in contact with the metal strip at temperature T 1 , and (ii) re-heating the resultant laminate to a temperature T 2 sufficient to cause the polymer films (A1) to interact with and become bound to the respective surface of the metal sheet, but such that the outer surface of the outer layer (A2) remains below temperature (Tm-A2). The laminates formed in accordance with the present invention are useful for forming into containers or various components thereof.
Inventors
- 👤 Peter J. Heyes
- 👤 Nicholas J. Middleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:34
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/02; B32B15/00; B32B15/04; B32B15/08; B32B15/09; B32B1/00; B32B15/18; B32B27/00; B32B27/06; B32B27/08; B32B27/36; B32B37/00; B32B37/06; B32B37/08; B32B37/085; B32B37/14; B32B37/16; B32B37/20; B32B37/203; B32B37/206; B32B38/00; B32B38/0036; B32B7/027; B65; B65D; B65D1/00; B65D1/22; B65D1/26; B65D1/28; B32B2255/00; B32B2255/20; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2310/00; B32B2310/04; B32B2310/0409; B32B2311/00; B32B2311/30; B32B2367/00; B32B2439/00; B32B2439/40; B32B2439/66; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1338; Y10T428/1352; Y10T428/1355; Y10T428/1359; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31786
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
104 words
A container or a component for a container formed from a laminated metal sheet having a polymer film adhered to each of its major surfaces, the polymer films having been adhered to the metal sheet by simultaneous thermal lamination, the polymer film adhered to each major surface of the metal sheet being a composite polyester film (A) comprising an inner layer (A1) of a substantially non-crystalline linear polyester having a softening point below 200° C. and a melting point above 150° C. but below 250° C. and an outer layer (A2) of a biaxially oriented linear polyester having a melting point above 250° C.
Claim 2
Dependent Claim
104 words
A container or a component for a container formed from a laminated metal sheet having a polymer film adhered to each of its major surfaces, the polymer films having been adhered to the metal sheet by simultaneous thermal lamination, the polymer film adhered to each major surface of the metal sheet being a composite polyester film (A) comprising an inner layer (A1) of a substantially non-crystalline linear polyester having a softening point below 200° C. and a melting point above 150° C. but below 250° C. and an outer layer (A2) of a biaxially oriented linear polyester having a melting point above 250° C.
Claim 3
Dependent Claim
94 words
A laminated metal sheet having a polymer film adhered to each of its major surfaces, the polymer films having been adhered to the metal sheet by simultaneous thermal lamination, the polymer film adhered to each major surface of the metal sheet being a composite polyester film (A) comprising an inner layer (A1) of a substantially non-crystalline linear polyester having a softening point below 200° C. and a melting point above 150° C. but below 250° C. and an outer layer (A2) of a biaxially oriented linear polyester having a melting point above 250° C.
Claim 4
Dependent Claim
94 words
A laminated metal sheet having a polymer film adhered to each of its major surfaces, the polymer films having been adhered to the metal sheet by simultaneous thermal lamination, the polymer film adhered to each major surface of the metal sheet being a composite polyester film (A) comprising an inner layer (A1) of a substantially non-crystalline linear polyester having a softening point below 200° C. and a melting point above 150° C. but below 250° C. and an outer layer (A2) of a biaxially oriented linear polyester having a melting point above 250° C.
Claim 5
Dependent Claim
18 words
A laminated metal sheet according to claim 2, wherein the outer layer (A2) is biaxially oriented polyethylene terephthalate.
Claim 6
Dependent Claim
27 words
A laminated metal sheet according to claim 2, wherein the metal sheet is electrolytically chromium coated steel with a dual layer of chromium metal and chromium oxide.
Claim 7
Dependent Claim
34 words
A laminated metal sheet according to claim 2, wherein the polyester of inner layer (A1) is a copolymer of ethylene terephthalate and ethylene isophthalate, or a copolymer formed from terephthalic acid and two alcohols.
Claim 8
Dependent Claim
20 words
A laminated metal sheet according to claim 5, wherein the mole ratio of ethylene terephthalate to ethylene isophthalate is 80:20.
Claim 9
Dependent Claim
26 words
A laminated metal sheet according to claim 5, wherein the polyester of inner layer (A1) is a copolymer formed from teraphthalic acid, ethylene glycol and cyclohexanedimethanol.
Claim 10
Dependent Claim
203 words
A process for producing by simultaneous lamination a polymer/metal/polymer laminate, which process comprises (i) simultaneously laminating to each of the major surfaces of a metal sheet a composite polyester film (A) comprising an inner layer (A1) of a substantially non-crystalline linear polyester having a softenign point (Ts-A1) below 200° C. and a melting point (Tm-A1) above 150° C. and below 250° C. and an outer layer (A2) of a biaxially oriented linear polyester having a crystallinity greater than 30% and having a melting point (Tm-A2) above 250° C., the metal sheet having been heated to a temperature T 1 above the softening point (Ts-A1), of the polyester of inner layer (A1) thereby to cause softening of the inner layer (A1) and adhesion thereof to the metal sheet, but below the temperature (Tm-A2) at which the outer surface of the outer layer (A2) will melt when in contact with the metal strip at temperature T 1 , and (ii) re-heating the resultant laminate to a temperature T 2 sufficient to cause the polymer film (A1) to interact with and become bound to the respective surface of the metal sheet, but such that the outer surface of the outer layer (A2) remains below temperature (Tm-A2).
Claim 11
Dependent Claim
203 words
A process for producing by simultaneous lamination a polymer/metal/polymer laminate, which process comprises (i) simultaneously laminating to each of the major surfaces of a metal sheet a composite polyester film (A) comprising an inner layer (A1) of a substantially non-crystalline linear polyester having a softenign point (Ts-A1) below 200° C. and a melting point (Tm-A1) above 150° C. and below 250° C. and an outer layer (A2) of a biaxially oriented linear polyester having a crystallinity greater than 30% and having a melting point (Tm-A2) above 250° C., the metal sheet having been heated to a temperature T 1 above the softening point (Ts-A1), of the polyester of inner layer (A1) thereby to cause softening of the inner layer (A1) and adhesion thereof to the metal sheet, but below the temperature (Tm-A2) at which the outer surface of the outer layer (A2) will melt when in contact with the metal strip at temperature T 1 , and (ii) re-heating the resultant laminate to a temperature T 2 sufficient to cause the polymer film (A1) to interact with and become bound to the respective surface of the metal sheet, but such that the outer surface of the outer layer (A2) remains below temperature (Tm-A2).
Claim 12
Dependent Claim
15 words
A process according to claim 8, wherein the laminate is reheated by induction heating means.
Claim 13
Dependent Claim
25 words
A process according to claim 8, wherein the metal sheet is electrolytically chromium coated steel with a dual layer of chromium metal and chromium oxide.
Claim 14
Dependent Claim
46 words
A process according to claim 8, wherein temperature T 1 to which the metal sheet is heated is above the melting point (Tm-A1) of the polyester inner layer (A1) thereby to cause melting of the inner layers (A1) and said adhesion thereof to the metal sheet.
Claim 15
Dependent Claim
28 words
A process according to claim 8, wherein the temperature T 1 is from 120° to 260° C. and the temperature T 2 is higher than T 1 .
Claim 16
Dependent Claim
17 words
A process according to claim 8, wherein the temperature T 1 is from 120° to 260° C.
Claim 17
Dependent Claim
17 words
A process according to claim 13, wherein the temperature T 1 is from 200° to 250° C.
Claim 18
Dependent Claim
17 words
A process according to claim 8, wherein the temperature T 2 is from 250° to 270° C.
Claim 19
Dependent Claim
35 words
A process according to claim 15, wherein the laminate is heated to a temperature in the range 250° to 270° C. and then held above 200° C. for at least 1 second before being quenched.
Claim 20
Dependent Claim
29 words
A process according to claim 16, wherein the laminate is heated to a temperature of 250° C., and then held above 240° C. for 2 seconds before being quenched.
Claim 21
Dependent Claim
14 words
A process according to claim 16, wherein the laminate is quenched rapidly and uniformly.
Claim 22
Dependent Claim
27 words
A process according to claim 18, wherein the laminate is quenched rapidly and uniformly by immersion in a tank of water or by line quenching with water.
Claim 23
Dependent Claim
32 words
A process according to claim 8, wherein the polyester of inner layer (A1) is a copolymer of ethylene terephthalate and ethylene isophthalate, or a copolymer formed from terephthalic acid and two alcohols.
Claim 24
Dependent Claim
18 words
A process according to claim 20, wherein the mole ratio of ethylene terephthalate to ethylene isophthalate is 80:20.
Claim 25
Dependent Claim
24 words
A process according to claim 20, wherein the polyester of inner layer (A1) is a copolymer formed from teraphthalic acid, ethylene glycol and cyclohexanedimethanol.
Claim 26
Dependent Claim
16 words
A process according to claim 8, wherein the outer layer (A2) is biaxially oriented polyethylene terephthalate.
Claim 27
Dependent Claim
22 words
A process according to claim 23, wherein the polyester film of outer layer (A2) has a crystallinity of from 40 to 50%.
References Cited (Backward Citations)
GB759876A
Cited
US2861022A
Cited
FR2216108A1
Cited
GB1501353A
Cited
GB1566422A
Cited
US4362775A
Cited
GB2055687A
Cited
EP0062385A2
Cited
EP0084827A2
Cited
GB2123746A
Cited
US4493872A
Cited
GB2164899A
Cited
JPS61149340A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-21 | 1995-04-22 | 1995-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-21 | 1999-04-22 | 1999-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-21 | 2003-04-22 | 2003-10-22 | $7700.00 | Window Closed / Lapsed |