US4156774A
Expired / Lapsed
US
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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: 1979-05-29
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Expires: 1998-07-03
Abstract
Abstract Thermoplastic copolyesters which have a minimum relative viscosity of 1.4 and contain, based on the polyester, (a) 40-50 mol % of units of terephthalic acid, (b) 0-10 mol % of units of aliphatic, cycloaliphatic or other aromatic dicarboxylic acids, (c) 15-30 mol % of units of ethylene glycol, (d) 34.5-15 mol % of units of diethylene glycol and (e) 0.5-5 mol % of units of polybutylene glycol with a molecular weight of 650 or the same amount by weight with a molecular weight of between 400 and 4,000, it being possible for up to 10 mol % of the units of ethylene glycol and/or diethylene glycol to be replaced by units of alkylenediols having 3 to 10 C atoms and/or units of a bisphenol dihydroxyalkyl ether, are outstandingly suitable as hot-melt adhesives.
Inventors
- 👤 Lothar Buxbaum
- 👤 Rolf Hugi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:26
CPC Classifications
C; C09; C09J; C09J167/00; C09J167/02; C09J167/025; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672; C08G63/68; C08G63/685; C08G63/6854
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
174 words
A thermoplastic copolyester which has a minimum relative viscosity of 1.4, 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 at least one aromatic dicarboxylic acid and also of a mixture of aliphatic diols and which contains, based on the polyester, (a) 40-50 mol % of units of terephthalic acid, (b) 0-10 mol % of units of aliphatic, cycloaliphatic or other aromatic dicarboxylic acids, (c) 15-30 mol % of units of ethylene glycol, (d) 34.5-15 mol % of units of diethylene glycol and (e) 0.5-5 mol % of units of polybutylene glycol with a molecular weight of 650 or the same amount by weight with a molecular weight of between 400 and 4,000, it being possible for up to 10 mol % of the units of ethylene glycol and/or diethylene glycol to be replaced by units of alkylenediols having 3 to 10 C atoms and/or units of a bisphenol dihydroxyalkyl ether.
Claim 2
Dependent Claim
174 words
A thermoplastic copolyester which has a minimum relative viscosity of 1.4, 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 at least one aromatic dicarboxylic acid and also of a mixture of aliphatic diols and which contains, based on the polyester, (a) 40-50 mol % of units of terephthalic acid, (b) 0-10 mol % of units of aliphatic, cycloaliphatic or other aromatic dicarboxylic acids, (c) 15-30 mol % of units of ethylene glycol, (d) 34.5-15 mol % of units of diethylene glycol and (e) 0.5-5 mol % of units of polybutylene glycol with a molecular weight of 650 or the same amount by weight with a molecular weight of between 400 and 4,000, it being possible for up to 10 mol % of the units of ethylene glycol and/or diethylene glycol to be replaced by units of alkylenediols having 3 to 10 C atoms and/or units of a bisphenol dihydroxyalkyl ether.
Claim 3
Dependent Claim
23 words
A copolyester according to claim 1, which has a minimum relative viscosity of 2.0, and which has a maximum relative viscosity of 5.0.
Claim 4
Dependent Claim
18 words
A copolyester according to claim 1, which contains at least 45 mol % of units of terephthalic acid.
Claim 5
Dependent Claim
34 words
A copolyester according to claim 1, wherein up to 5 mol % of the units of ethylene glycol and/or diethylene glycol have been replaced by units of alkylenediols and/or of a bisphenol dihydroxyalkyl ether.
Claim 6
Dependent Claim
56 words
A copolyester according to claim 1, which contains (c) 25-28 mol % of units of ethylene glycol, (d) 22-19 mol % of units of diethylene glycol and (e) 3 mol % of units of polybutylene glycol with a molecular weight of 650 of the same amount by weight with a molecular weight between 400 and 4,000.
Claim 7
Dependent Claim
42 words
A copolyester according to claim 1, wherein the dicarboxylic acids of component (b) as aliphatic dicarboxylic acids have 4-36 C atoms, as cycloaliphatic dicarboxylic acids have 6 to 12 C atoms and as aromatic dicarboxylic acids have 8 to 14 C atoms.
Claim 8
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 9
Dependent Claim
63 words
A copolyester according to claim 1, which has a minimum viscosity of 2.0 and contains (c) 20-30 mol % of units of ethylene glycol, (d) 28-15 mol % of units of diethylene glycol and (e) 0.5-5 mol % of units of polybutylene glycol with a molecular weight of 650 or the same amount by weight with a molecular weight between 400 and 4,000.
Claim 10
Dependent Claim
21 words
A copolyester according to claim 2 which has a minimum relative viscosity of 2.4 and a maximum relative viscosity of 4.0.
Claim 11
Dependent Claim
16 words
A copolyester according to claim 3 which contains 50 mol % of units of terephthalic acid.
Claim 12
Dependent Claim
10 words
A hot-melt adhesive comprising a copolyester according to claim 1.
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) | 1982-05-28 | 1982-11-27 | 1983-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-28 | 1986-11-27 | 1987-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-28 | 1990-11-27 | 1991-05-29 | $7700.00 | Window Closed / Lapsed |