Patent US4143790A successfully refreshed from Google Patents.
US4143790A
Expired / Lapsed
US
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Coated metal structure and process for production thereof
Assignee: Toray Industries Inc
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Filing: 1976-11-22
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Granted: 1979-03-13
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Expires: 1996-11-22
Abstract
Abstract In a coated metal structure comprising a metal substrate and a coating layer of a thermoplastic polyester resin heat-bonded to the metal surface, the polyester resin has a relative viscosity of 1.2 to 1.8 as measured at 25° C. in o-chlorophenol at a concentration of 0.5 g/100 ml and the tack point of the polyester resin is not lower than 130° C. and the degree of crystallinity of the polyester resin is up to 30%. This structure has improved peel resistance and is excellent in mechanical and chemical properties, especially adaptability to shaping processing and corrosion resistance. This structure can easily be formed into various vessels and containers and closure means of vessels and containers by such processing as drawing and ironing. This structure provides shaped articles excellent in peel resistance, corrosion resistance and processability.
Inventors
- 👤 Hiroshi Ueno
- 👤 Michiko Tsurumaru
- 👤 Shinya Otsuka
- 👤 Hiroshi Matsubayashi
- 👤 Masanori Aizawa
- 👤 Hiroki Sano
- 👤 Yukio Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:08
CPC Classifications
B; B65; B65D; B65D25/00; B65D25/14; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
210 words
A metal can formed from a coated metal structure wherein said coated metal structure consists essentially of a metal substrate and only a single overcoat layer composed primarily of a thermoplastic polyester resin which is heat-bonded directly to the surface of said metal substrate, said polyester resin being composed of recurring units represented by the following formula: ##STR3## wherein R 1 stands for a divalent hydrocarbon group, at least 45 mole % of which is a p-phenylene group, each of R 2 and R 3 stands for a divalent aliphatic hydrocarbon group, at least 45 mole % of which is a tetramethylene group, p and q each stands for a number equal to at least 1, and m and n each selectively stands for 0 or a number equal to at least 1 with the proviso that when one of m and n is 0 the other of m and n must be a number equal to at least 1, and having a relative viscosity of 1.2 to 1.8 as measured at 25° C. in o-chlorophenol at a concentration of 0.5 g/100 ml, and the tack point of said polyester resin being not lower than 130° C. and the degree of crystallinity of said polyester resin being up to 30%.
Claim 2
Dependent Claim
210 words
A metal can formed from a coated metal structure wherein said coated metal structure consists essentially of a metal substrate and only a single overcoat layer composed primarily of a thermoplastic polyester resin which is heat-bonded directly to the surface of said metal substrate, said polyester resin being composed of recurring units represented by the following formula: ##STR3## wherein R 1 stands for a divalent hydrocarbon group, at least 45 mole % of which is a p-phenylene group, each of R 2 and R 3 stands for a divalent aliphatic hydrocarbon group, at least 45 mole % of which is a tetramethylene group, p and q each stands for a number equal to at least 1, and m and n each selectively stands for 0 or a number equal to at least 1 with the proviso that when one of m and n is 0 the other of m and n must be a number equal to at least 1, and having a relative viscosity of 1.2 to 1.8 as measured at 25° C. in o-chlorophenol at a concentration of 0.5 g/100 ml, and the tack point of said polyester resin being not lower than 130° C. and the degree of crystallinity of said polyester resin being up to 30%.
Claim 3
Dependent Claim
37 words
A metal can as set forth in claim 1 wherein the thermoplastic polyester is at least one member selected from the group consisting of poly(tetramethylene terephthalate), poly(tetramethylene/ethylene terephthalate), poly(tetramethylene terephthalate/isophthalate), poly(ethylene terephthalate/isophthalate), poly(ethylene/p-hexahydroxylylene terephthalate) and poly(tetramethylene/polyoxytetramethylene terephthalate).
Claim 4
Dependent Claim
36 words
A metal can as set forth in claim 1 wherein said layer is a blend of at least 70% by weight of said thermoplastic polyester resin and up to 30% by weight of other thermoplastic resin.
Claim 5
Dependent Claim
209 words
A metal closure formed from a coated metal structure wherein said coated metal structure consists essentially of a metal substrate and only a single overcoat layer composed primarily of a thermoplastic polyester resin which is heat-bonded directly to the surface of said metal substrate, said polyester resin being composed of recurring units represented by the following formula: ##STR4## wherein R 1 stands for a divalent hydrocarbon group, at least 45 mole % of which is a p-phenylene group, each of R 2 and R 3 stands for a divalent aliphatic hydrocarbon group, at least 45 mole % of which is a tetramethylene group, p and q each stands for a number of at least 1, and m and n each selectively stands for 0 or a number equal to at least 1 with the proviso that when one of m and n is 0 the other of m and n must be a number equal to at least 1, and having a relative viscosity of 1.2 to 1.8 as measured at 25° C. in o-chlorophenol at a concentration of 0.5 g/100 ml, and the tack point of said polyester resin being not lower than 130° C. and the degree of crystallinity of said polyester resin being up to 30%.
Claim 6
Dependent Claim
209 words
A metal closure formed from a coated metal structure wherein said coated metal structure consists essentially of a metal substrate and only a single overcoat layer composed primarily of a thermoplastic polyester resin which is heat-bonded directly to the surface of said metal substrate, said polyester resin being composed of recurring units represented by the following formula: ##STR4## wherein R 1 stands for a divalent hydrocarbon group, at least 45 mole % of which is a p-phenylene group, each of R 2 and R 3 stands for a divalent aliphatic hydrocarbon group, at least 45 mole % of which is a tetramethylene group, p and q each stands for a number of at least 1, and m and n each selectively stands for 0 or a number equal to at least 1 with the proviso that when one of m and n is 0 the other of m and n must be a number equal to at least 1, and having a relative viscosity of 1.2 to 1.8 as measured at 25° C. in o-chlorophenol at a concentration of 0.5 g/100 ml, and the tack point of said polyester resin being not lower than 130° C. and the degree of crystallinity of said polyester resin being up to 30%.
Claim 7
Dependent Claim
37 words
A metal closure as set forth in claim 4 wherein the thermoplastic polyester is at least one member selected from the group consisting of poly(tetramethylene terephthalate), poly(tetramethylene/ethylene terephthalate), poly(tetramethylene terephthalate/isophthalate), poly(ethylene terephthalate/isophthalate), poly(ethylene/p-hexahydroxylylene terephthalate) and poly(tetramethylene/polyoxytetramethylene terephthalate).
Claim 8
Dependent Claim
36 words
A metal closure as set forth in claim 4 wherein said layer is a blend of at least 70% by weight of said thermoplastic polyester resin and up to 30% by weight of other thermoplastic resin.
Claim 9
Dependent Claim
243 words
A side seamless container formed from a coated metal blank by drawing or drawing-ironing, which comprises a side wall portion without a seam on the side face thereof and a bottom portion seamlessly integrally connected with said side wall portion, wherein said coated metal blank consists essentially of a metal substrate and only a single overcoat layer composed mainly of a thermoplastic polyester resin, which is heat-bonded directly to at least one surface of said metal substrate, said polyester resin being composed of recurring units represented by the following formula: ##STR5## wherein R 1 stands for a divalent hydrocarbon group, at least 45 mole % of which is a p-phenylene group, each of R 2 and R 3 stands for a divalent aliphatic hydrocarbon group, at least 45 mole % of which is a tetraethylene group, p and q each stands for a number equal to at least 1, and m and n each selectively stands for 0 or a number equal to at least 1 with the proviso that when one of m and n is 0 the other of m and n must be a number equal to at least 1, and having a relative viscosity of 1.2 to 1.8 as measured at 25° C. in o-chlorophenol at a concentration of 0.5 g/100 ml, and the tack point of said polyester resin being not lower than 130° C. and the degree of crystallinity of said polyester resin being up to 30%.
Claim 10
Dependent Claim
243 words
A side seamless container formed from a coated metal blank by drawing or drawing-ironing, which comprises a side wall portion without a seam on the side face thereof and a bottom portion seamlessly integrally connected with said side wall portion, wherein said coated metal blank consists essentially of a metal substrate and only a single overcoat layer composed mainly of a thermoplastic polyester resin, which is heat-bonded directly to at least one surface of said metal substrate, said polyester resin being composed of recurring units represented by the following formula: ##STR5## wherein R 1 stands for a divalent hydrocarbon group, at least 45 mole % of which is a p-phenylene group, each of R 2 and R 3 stands for a divalent aliphatic hydrocarbon group, at least 45 mole % of which is a tetraethylene group, p and q each stands for a number equal to at least 1, and m and n each selectively stands for 0 or a number equal to at least 1 with the proviso that when one of m and n is 0 the other of m and n must be a number equal to at least 1, and having a relative viscosity of 1.2 to 1.8 as measured at 25° C. in o-chlorophenol at a concentration of 0.5 g/100 ml, and the tack point of said polyester resin being not lower than 130° C. and the degree of crystallinity of said polyester resin being up to 30%.
Claim 11
Dependent Claim
38 words
A side seamless container as set forth in claim 7 wherein the thermoplastic polyester is at least one member selected from the group consisting of poly(tetramethylene terephthalate), poly(tetramethylene/ethylene terephthalate), poly(tetramethylene terephthalate/isophthalate), poly(ethylene terephthalate/isophthalate), poly(ethylene/p-hexahydroxylene terephthalate) and poly(tetramethylene/polyoxytetramethylene terephthalate).
Claim 12
Dependent Claim
24 words
A container as set forth in claim 7 wherein the thickness of the coating layer is in the range of from 1μ to 100μ.
Claim 13
Dependent Claim
31 words
A container as set forth in claim 7 wherein the coating layer is formed at least on that surface of the metal substrate which constitutes the inner surface of the container.
Claim 14
Dependent Claim
37 words
A side seamless container as set forth in claim 7 wherein said layer is a blend of at least 70% by weight of said thermoplastic polyester resin and up to 30% by weight of other thermoplastic resin.
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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) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |