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US4154918A
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Thermoplastic copolyesters, processes for their preparation and their use
Assignee: BASF Corp
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Filing: 1978-07-03
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Granted: 1979-05-15
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Expires: 1998-07-03
Abstract
Abstract Thermoplastic copolyesters which have a minimum relative viscosity of 1.7 and contain (a) 35-47.5 mol % of units of terephthalic acid, (b) 15-2.5 mol % of units of isophthalic acid, (c) 10-30 mol % of units of ethylene glycol and (d) 40-20 mol % of units of diethylene glycol, it being possible for up to 9 mol % of the units of ethylene glycol to be replaced by units of a bisphenol dihydroxyalkyl ether, are very suitable as hot-melt adhesives.
Inventors
- 👤 Lothar Buxbaum
- 👤 Rolf Hugi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:09
CPC Classifications
C; C09; C09J; C09J167/00; C09J167/02; C09J167/025; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
123 words
A thermoplastic copolyester which has a minimum relative viscosity of 1.7, measured at 30° C. on a solution of 1 g of polyester in 100 ml of a solvent consisting of equal parts of phenol and symmetrical tetrachloroethane, and contains condensed units of a mixture of aromatic dicarboxylic acids and also of aliphatic diols, and which contains, based on the polyester, (a) 35-47.5 mol % of units of terephthalic acid, (b) 15-2.5 mol % of units of isophthalic acid, (c) 10-30 mol % of units of ethylene glycol and (d) 40-20 mol % of units of diethylene glycol, it being possible for up to 9 mol % of the units of ethylene glycol to be replaced by units of a bisphenol dihydroxyalkyl ether.
Claim 2
Dependent Claim
123 words
A thermoplastic copolyester which has a minimum relative viscosity of 1.7, measured at 30° C. on a solution of 1 g of polyester in 100 ml of a solvent consisting of equal parts of phenol and symmetrical tetrachloroethane, and contains condensed units of a mixture of aromatic dicarboxylic acids and also of aliphatic diols, and which contains, based on the polyester, (a) 35-47.5 mol % of units of terephthalic acid, (b) 15-2.5 mol % of units of isophthalic acid, (c) 10-30 mol % of units of ethylene glycol and (d) 40-20 mol % of units of diethylene glycol, it being possible for up to 9 mol % of the units of ethylene glycol to be replaced by units of a bisphenol dihydroxyalkyl ether.
Claim 3
Dependent Claim
15 words
A copolyester according to claim 1, which has a relative viscosity of 1.7 to 4.0.
Claim 4
Dependent Claim
27 words
A copolyester according to claim 1, which contains (a) 40-45 mol % of units of terephthalic acid and (b) 10-5 mol % of units of isophthalic acid.
Claim 5
Dependent Claim
27 words
A copolyester according to claim 1, which contains (c) 12.5-25 mol % of units of ethylene glycol and (d) 37.5-25 mol % of units of diethylene glycol.
Claim 6
Dependent Claim
15 words
A copolyester according to claim 1, wherein the bisphenol dihydroxyalkyl ether is 2,2-bis-[4'-(β-hydroxyethoxy)-phenyl]-propane or 1,1-bis-[4'-(β-hydroxyethoxy)-phenyl]-cyclohexane.
Claim 7
Dependent Claim
28 words
A copolyester according to claim 1, wherein 0.025-0.25 mol % of the dicarboxylic acids and/or diols (a) to (d) has been replaced by at least trifunctional polyester-forming monomers.
Claim 8
Dependent Claim
15 words
A copolyester according to claim 2 which has a relative viscosity of 1.9 to 3.0.
Claim 9
Dependent Claim
15 words
A copolyester according to claim 7 which has a relative viscosity of 1.9 to 2.5.
Claim 10
Dependent Claim
10 words
A hot-melt adhesive comprising a copolyester according to claim 1.
References Cited (Backward Citations)
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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) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |