US4579914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of polyesteramides and polyamides
Assignee: Dow Chemical Co
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Filing: 1985-03-18
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Granted: 1986-04-01
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Expires: 2005-03-18
Abstract
Abstract Disclosed are novel blends comprising segmented polyesteramides with minor amounts of aliphatic polyamides. The blends are characterized by good physical properties including improved elongation and solvent resistance over the base polyesteramides. The polymers so obtained find utility in the making of seals, gaskets, bushings, and the like.
Inventors
- 👤 II Robert G. Nelb
- 👤 Kemal Onder
- 👤 Keith G. Saunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:06
CPC Classifications
C; C08; C08L; C08L77/00; C08L77/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
160 words
A polymer blend comprising (a) from about 99 to about 50 percent by weight of a segmented polyesteramide characterized by a recurring unit of the formula ##STR3## wherein R is selected from the class consisting of arylene of the formulae: ##STR4## 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, and isophthalic and terephthalic acids, m has a mean value of not more than 1 but 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 300° C., and x is a number having an average value from zero to 10; and (b) from about 1 to about 50 percent by weight of an aliphatic polyamide.
Claim 2
Dependent Claim
160 words
A polymer blend comprising (a) from about 99 to about 50 percent by weight of a segmented polyesteramide characterized by a recurring unit of the formula ##STR3## wherein R is selected from the class consisting of arylene of the formulae: ##STR4## 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, and isophthalic and terephthalic acids, m has a mean value of not more than 1 but 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 300° C., and x is a number having an average value from zero to 10; and (b) from about 1 to about 50 percent by weight of an aliphatic polyamide.
Claim 3
Dependent Claim
21 words
A polymer blend in accordance with claim 1 wherein the residue A in the polyesteramide is that of a polyester glycol.
Claim 4
Dependent Claim
16 words
A polymer blend in accordance with claim 2 wherein said polyester glycol is a poly(tetramethylene azelate)glycol.
Claim 5
Dependent Claim
20 words
A polymer blend in accordance with claim 1 wherein the residue B in the polyesteramide is that of azelaic acid.
Claim 6
Dependent Claim
21 words
A polymer blend in accordance with claim 1 wherein the average value of x in the polyesteramide is greater than 0.
Claim 7
Dependent Claim
22 words
A polymer blend in accordance with claim 1 wherein the residue D in the polyesteramide is that of an aliphatic dicarboxylic acid.
Claim 8
Dependent Claim
16 words
A polymer blend in accordance with claim 6 wherein the residue is that of azelaic acid.
Claim 9
Dependent Claim
24 words
A polymer blend in accordance with claim 6 wherein the residue is that of a 50/50 mole weight mixture of azelaic and adipic acid.
Claim 10
Dependent Claim
34 words
A polymer blend in accordance with claim 1 wherein the aliphatic polyamide is a linear polyamide having an inherent viscosity of at least 0.5 dl/g. measured as a 0.5 percent w/w solution in m-cresol.
Claim 11
Dependent Claim
14 words
A polymer blend in accordance with claim 9 wherein said polyamide is nylon 6.
Claim 12
Dependent Claim
14 words
A polymer blend in accordance with claim 9 wherein said polyamide is nylon 66.
Claim 13
Dependent Claim
39 words
A polymer blend in accordance with claim 1 wherein said polyesteramide (a) is present in from about 95 to about 60 percent by weight and said polyamide (b) is accordingly from about 5 to about 40 percent by weight.
Claim 14
Dependent Claim
93 words
A polymer blend in accordance with claim 1 comprising (a) from about 95 to about 60 percent by weight of said polyesteramide wherein R is 4,4'-methylenebis(phenylene); A is the residue of a poly(tetramethylene azelate)glycol; B is the residue of azelaic acid; D is the residue of an aliphatic dicarboxylic acid; and x has an average value greater than 0; and (b) from about 5 to about 40 percent by weight of a linear aliphatic polyamide having an inherent viscosity of at least 0.5 dl/g. measured as a 0.5 percent w/w solution in m-cresol.
Claim 15
Dependent Claim
25 words
A polymer blend in accordance with claim 13 wherein in said polyesteramide D is azelaic acid and said polyamide is nylon 6 or nylon 66.
Claim 16
Dependent Claim
33 words
A polymer blend in accordance with claim 13 wherein in said polyesteramide D is a 50/50 mole weight mixture of azelaic and adipic acids and said polyamide is nylon 6 or nylon 66.
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) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |