US4500575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot-melt adhesive of a copolyester of a dibasic acid with a polyhydric alcohol
Assignee: Toyo Seikan Group Holdings Ltd
•
Filing: 1983-10-18
•
Granted: 1985-02-19
•
Expires: 2003-10-18
Abstract
Abstract Disclosed is a hot-melt adhesive which comprises a copolyester of a dibasic acid component comprising 70 to 97 mole % of terephthalic acid and other dibasic acid with a polyhydric alcohol component comprising 70 to 97 mole % of 1,4-butane-diol, 3 to 30 mole % of diethylene glycol and up to 20 mole % of other polyhydric alcohol having 2 to 5 carbon atoms, said copolyester having a reduced viscosity of at least 0.6 dl/g as measured at a temperature of 30° C. in a phenol/tetrachloroethane mixed solvent having a phenol/tetrachloroethane weight ratio of 60/40 at a polymer concentration of 0.25 g/100 ml, a glass transition temperature of at least 31° C. and a crystallinity of 15 to 40 %. This hot-melt adhesive is excellent in the operation adaptability, and in the form of a film, the adhesive has an appropriate rigidity and a good dimension stability. Furthermore, when this hot-melt adhesive is formed into an adhesive layer between seams by hot bonding, the adhesive layer provides a high creep resistance and a good dimension stability. This hot-melt adhesive is valuably used for producing a metal vessel having a circumferential side seam by bonding cup-shaped lower and upper members along circumferential open ends of the two members.
Inventors
- 👤 Kazuo Taira
- 👤 Akihiko Morofuji
- 👤 Hiroshi Ueno
- 👤 Seishichi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:13
CPC Classifications
C; C09; C09J; C09J167/00; C08; C08G; C08G63/00; C08G63/66; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355; Y10T428/1359
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
202 words
A hot-melt adhesive comprising a copolyester of a dibasic acid component comprising 70 to 97 mole % of terephthalic acid and other dibasic acid with a polyhydric alcohol component comprising 70 to 97 mole % of 1,4-butane-diol, 3 to 30 mole % of diethylene glycol and up to 20 mole % of other polyhydric alcohol having 2 to 5 carbon atoms, said copolyester having a reduced viscosity of at least 0.6 dl/g as measured at a temperature of 30° C. in a phenol/tetrachloroethane mixed solvent having a phenol/tetrachloroethane weight ratio of 60/40 at a polymer concentration of 0.25 g/100 ml, a glass transition temperature of at least 31° C. and a crystallinity of 15 to 40% said copolyester having a creep displacement quantity, ΔX, of not greater than 0.16 mm, said creep displacement quantity being measured by applying a static load of 20 kg at a temperature of 70° C. to a test piece consisting of lap-bonded two cut plates having a width of 20 mm and a length of 50 mm through the copolyester adhesive film having a size of 5 mm×20 mm and a thickness of about 80 microns, and determining the displacement quantity, ΔX, after passage of 24 hours.
Claim 2
Dependent Claim
202 words
A hot-melt adhesive comprising a copolyester of a dibasic acid component comprising 70 to 97 mole % of terephthalic acid and other dibasic acid with a polyhydric alcohol component comprising 70 to 97 mole % of 1,4-butane-diol, 3 to 30 mole % of diethylene glycol and up to 20 mole % of other polyhydric alcohol having 2 to 5 carbon atoms, said copolyester having a reduced viscosity of at least 0.6 dl/g as measured at a temperature of 30° C. in a phenol/tetrachloroethane mixed solvent having a phenol/tetrachloroethane weight ratio of 60/40 at a polymer concentration of 0.25 g/100 ml, a glass transition temperature of at least 31° C. and a crystallinity of 15 to 40% said copolyester having a creep displacement quantity, ΔX, of not greater than 0.16 mm, said creep displacement quantity being measured by applying a static load of 20 kg at a temperature of 70° C. to a test piece consisting of lap-bonded two cut plates having a width of 20 mm and a length of 50 mm through the copolyester adhesive film having a size of 5 mm×20 mm and a thickness of about 80 microns, and determining the displacement quantity, ΔX, after passage of 24 hours.
Claim 3
Dependent Claim
26 words
A hot-melt adhesive as set forth in claim 1, wherein the acid component comprises 80 to 95 mole % of terephthalic acid and other dibasic acid.
Claim 4
Dependent Claim
46 words
A hot-melt adhesive as set forth in claim 1, wherein the polyhydric alcohol component comprises 80 to 95 mole % of 1,4-butanediol, 5 to 20 mole % of diethylene glycol and up to 20 mole % of other polyhydric alcohol having 2 to 5 carbon atoms.
Claim 5
Dependent Claim
34 words
A hot-melt adhesive as set forth in claim 1, wherein said other dibasic acid is at least one member selected from isophthalic acid, cyclohexane-dicarboxylic acid, adipic acid, sebacic acid, succinic acid and dodecane-dicarboxylic acid.
Claim 6
Dependent Claim
29 words
A hot-melt adhesive as set forth in claim 1, wherein said other polyhydric alcohol is at least one member selected from ethylene glycol, propylene glycol, neopentyl glycol and glycerol.
Claim 7
Dependent Claim
39 words
A hot-melt adhesive as set forth in claim 1, which is used for the manufacture of a metal vessel having a circumferential side seam by bonding cup-shaped lower and upper members along circumferential open ends of said two members.
Claim 8
Dependent Claim
160 words
In a bottle-shaped metal vessel having a circumferential side seam formed by lap-bonding circumferential open ends of cup-shaped upper and lower members obtained by draw forming or draw-ironing forming of a metal blank through an adhesive, the improvement wherein said adhesive comprises a copolyester of a dibasic acid component comprising 70 to 97 mole % of terephthalic acid and 3 to 30 mole % of other dibasic acid with a polyhydric alcohol component comprising 70 to 97 mole % of 1,4-butane-diol, 3 to 30 mole % of diethylene glycol and up to 20 mole % of other polyhydric alcohol having 2 to 5 carbon atoms, said copolyester having a reduced viscosity of at least 0.6 dl/g as measured at a temperature of 30° C. in a phenol/tetrachloroethane mixed solvent having a phenol/tetrachloroethane weight ratio of 60/40 at a polymer concentration of 0.25 g/100 ml, a glass transition temperature of at least 31° C. and a crystallinity of 15 to 40%.
Claim 9
Dependent Claim
160 words
In a bottle-shaped metal vessel having a circumferential side seam formed by lap-bonding circumferential open ends of cup-shaped upper and lower members obtained by draw forming or draw-ironing forming of a metal blank through an adhesive, the improvement wherein said adhesive comprises a copolyester of a dibasic acid component comprising 70 to 97 mole % of terephthalic acid and 3 to 30 mole % of other dibasic acid with a polyhydric alcohol component comprising 70 to 97 mole % of 1,4-butane-diol, 3 to 30 mole % of diethylene glycol and up to 20 mole % of other polyhydric alcohol having 2 to 5 carbon atoms, said copolyester having a reduced viscosity of at least 0.6 dl/g as measured at a temperature of 30° C. in a phenol/tetrachloroethane mixed solvent having a phenol/tetrachloroethane weight ratio of 60/40 at a polymer concentration of 0.25 g/100 ml, a glass transition temperature of at least 31° C. and a crystallinity of 15 to 40%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |