US4129715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester amides suitable for injection molding
Assignee: Dow Chemical Co
•
Filing: 1978-01-16
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Granted: 1978-12-12
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Expires: 1998-01-16
Abstract
Abstract Substantially linear, segmented polyester amides are described which contain aromatic residues in the "hard" segments but which still possess sufficiently low melt properties to be injection moldable. The polyester amides are obtained by reacting a carboxylic acid-terminated prepolymer (derived by reacting an excess of a dicarboxylic acid with a polymeric diol of molecular weight 400 to 4000) with a stoichiometric amount of methylenebis(phenyl isocyanate) or toluene diisocyanate or mixtures of these isocyanates and, optionally, a dicarboxylic acid.
Inventors
- 👤 Augustin T. Chen
- 👤 William J. Farrissey, Jr.
- 👤 II Robert G. Nelb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:37
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4263; C08G69/00; C08G69/44; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
131 words
A substantially linear, segmented thermoplastic polyester-amide characterized by a recurring unit of the formula: ##STR23## wherein R is selected from the class consisting of arylene of the formulae ##STR24## and mixtures thereof, A is the residue of a polymeric diol HO--A--OH having a molecular weight from about 400 to about 4000, B is the residue of a dicarboxylic acid HOOC--B--COOH selected from the class consisting of aliphatic dicarboxylic acids having from 6 to 14 carbon atoms, inclusive, isophthalic and terephthalic acids, m has a mean value of less than 1 and greater than 0, D is the residue of a dicarboxylic acid HOOC--D--COOH such that the melt temperature of the hard segment is not greater than 280° C., and x is a number having an average value from zero to 10.
Claim 2
Dependent Claim
131 words
A substantially linear, segmented thermoplastic polyester-amide characterized by a recurring unit of the formula: ##STR23## wherein R is selected from the class consisting of arylene of the formulae ##STR24## and mixtures thereof, A is the residue of a polymeric diol HO--A--OH having a molecular weight from about 400 to about 4000, B is the residue of a dicarboxylic acid HOOC--B--COOH selected from the class consisting of aliphatic dicarboxylic acids having from 6 to 14 carbon atoms, inclusive, isophthalic and terephthalic acids, m has a mean value of less than 1 and greater than 0, D is the residue of a dicarboxylic acid HOOC--D--COOH such that the melt temperature of the hard segment is not greater than 280° C., and x is a number having an average value from zero to 10.
Claim 3
Dependent Claim
16 words
A thermoplastic polyester-amide according to claim 1 wherein A is the residue of a polyether glycol.
Claim 4
Dependent Claim
15 words
A thermoplastic polyester-amide according to claim 2 wherein the polyether glycol is a polytetramethylene glycol.
Claim 5
Dependent Claim
19 words
A thermoplastic polyester-amide according to claim 2 wherein the polyether glycol is a polypropylene glycol capped with ethylene oxide.
Claim 6
Dependent Claim
24 words
A thermoplastic polyester-amide according to claim 1 wherein D is the residue of a mixture of approximately equivalent quantities of adipic and azelaic acids.
Claim 7
Dependent Claim
15 words
A thermoplastic polyester-amide according to claim 1 wherein D is the residue of azelaic acid.
Claim 8
Dependent Claim
16 words
A thermoplastic polyester-amide according to claim 1 wherein A is the residue of a polyester glycol.
Claim 9
Dependent Claim
22 words
A thermoplastic polyester-amide according to claim 7 wherein the polyester glycol is a poly(tetramethylene azelate)glycol having a molecular weight of about 2000.
Claim 10
Dependent Claim
15 words
A thermoplastic polyester-amide according to claim 1 wherein B is the residue of adipic acid.
Claim 11
Dependent Claim
15 words
A thermoplastic polyester-amide according to claim 1 wherein B is the residue of azelaic acid.
Claim 12
Dependent Claim
24 words
A thermoplastic polyester-amide according to claim 1 wherein B is the residue of a mixture of approximately equimolar amounts of azelaic and adipic acids.
Claim 13
Dependent Claim
11 words
A thermoplastic polyester-amide according to claim 1 wherein R represents ##STR25##
Claim 14
Dependent Claim
30 words
A thermoplastic polyester-amide according to claim 1 wherein R in 50 percent of the recurring units represents ##STR26## and, in the remaining 50 percent of the recurring units, represents ##STR27##
Claim 15
Dependent Claim
26 words
A thermoplastic polyester-amide according to claim 1 wherein R in 40 percent of the recurring units represents ##STR28## and, in the remaining recurring units, represents ##STR29##
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) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |