Patent US4772649A successfully refreshed from Google Patents.
US4772649A
Expired / Lapsed
US
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Polyesteramide and sufficient carbodiimide to impart improved compression set
Assignee: Dow Chemical Co
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Filing: 1986-12-18
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Granted: 1988-09-20
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Expires: 2006-12-18
Abstract
Abstract Disclosed are novel blends comprising segmented polyesteramides with minor amounts of carbodiimide containing materials. The blends are characterized by excellent physical properties and improved compression set characteristics over the polyesteramides in the absence of the carbodiimide component. This allows the polymers obtained to find utility in the making of seals or gaskets which heretofore the base polyesteramides could not satisfy.
Inventors
- 👤 Philip S. Andrews
- 👤 Augustin T. Chen
- 👤 Kemal Onder
- 👤 Laura B. Weaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:09
CPC Classifications
C; C08; C08L; C08L77/00; C08L77/04; C08L77/12; C08K; C08K5/00; C08K5/16; C08K5/29
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
178 words
A fluxed polymer blend comprising (a) a segmented polyesteramide characterized by a recurring unit of the formula ##STR3## wherein Ar is an arylene radical, A is the residue of a polymeric diol HOAOH having a molecular weight from about 400 to about 4000, B is the residue of a dicarboxylic acid HOOCBCOOH 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 HOOCDCOOH such that the melt temperature of the hard segment derived therefrom is not greater than 325° C., and x is a number having an average value from 0 to 10; and (b) a sufficient amount of a carbodiimide containing material selected from the group consisting of a monocarbodiimide, a polycarbodiimide, and mixtures thereof to provide an improvement in the compression set of an unannealed or annealed blend of at least 5 or 10 percent respectively over the base polyester amide (a).
Claim 2
Dependent Claim
178 words
A fluxed polymer blend comprising (a) a segmented polyesteramide characterized by a recurring unit of the formula ##STR3## wherein Ar is an arylene radical, A is the residue of a polymeric diol HOAOH having a molecular weight from about 400 to about 4000, B is the residue of a dicarboxylic acid HOOCBCOOH 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 HOOCDCOOH such that the melt temperature of the hard segment derived therefrom is not greater than 325° C., and x is a number having an average value from 0 to 10; and (b) a sufficient amount of a carbodiimide containing material selected from the group consisting of a monocarbodiimide, a polycarbodiimide, and mixtures thereof to provide an improvement in the compression set of an unannealed or annealed blend of at least 5 or 10 percent respectively over the base polyester amide (a).
Claim 3
Dependent Claim
26 words
A blend according to claim 1 wherein said sufficient amount of (b) is from about 0.2 percent to about 10 percent by weight of said blend.
Claim 4
Dependent Claim
12 words
A blend according to claim 2 wherein said (b) is a polycarbodiimide.
Claim 5
Dependent Claim
13 words
A blend according to claim 3 wherein said (b) is an aromatic polycarbodiimide.
Claim 6
Dependent Claim
18 words
A blend according to claim 1 wherein A in said (I) is the residue of a polyester glycol.
Claim 7
Dependent Claim
27 words
A blend according to claim 1 wherein B in said (I) is the residue of an aliphatic dicarboxylic acid having from 6 to 14 carbon atoms, inclusive.
Claim 8
Dependent Claim
18 words
A blend according to claim 1 wherein x in said (I) has a value from 0 to 3.
Claim 9
Dependent Claim
19 words
A blend according to claim 1 wherein D in said (I) is the residue of an aliphatic dicarboxylic acid.
Claim 10
Dependent Claim
10 words
A blend according to claim 1 wherein Ar represents 4,4'-methylenebis(phenylene).
Claim 11
Dependent Claim
146 words
A fluxed polymer blend comprising (a) a segmented polyesteramide characterized by a recurring unit of the formula ##STR4## wherein A is the residue of a polyester glycol HOAOH having a molecular weight from about 400 to about 4000, B is the residue of an aliphatic dicarboxylic acid having from 6 to 14 carbon atoms, inclusive, m has a mean value of not more than 1 but greater than 0, D is the residue of an aliphatic dicarboxylic acid HOOCDCOOH such that the melt temperature of the hard segment derived therefrom is not greater than 325° C., and x has an average value in the range of about 0 to 3; and (b) a sufficient amount of an aromatic polycarbodiimide to provide an improvement in the compression set of an unannealed or annealed blend of at least 5 or 10 percent respectively over the base polyesteramide (a).
Claim 12
Dependent Claim
146 words
A fluxed polymer blend comprising (a) a segmented polyesteramide characterized by a recurring unit of the formula ##STR4## wherein A is the residue of a polyester glycol HOAOH having a molecular weight from about 400 to about 4000, B is the residue of an aliphatic dicarboxylic acid having from 6 to 14 carbon atoms, inclusive, m has a mean value of not more than 1 but greater than 0, D is the residue of an aliphatic dicarboxylic acid HOOCDCOOH such that the melt temperature of the hard segment derived therefrom is not greater than 325° C., and x has an average value in the range of about 0 to 3; and (b) a sufficient amount of an aromatic polycarbodiimide to provide an improvement in the compression set of an unannealed or annealed blend of at least 5 or 10 percent respectively over the base polyesteramide (a).
Claim 13
Dependent Claim
25 words
A blend according to claim 10 wherein A and B in said (II) are the residues of a poly(tetramethylene azelate) glycol and azelaic acid respectively.
Claim 14
Dependent Claim
26 words
A blend according to claim 11 wherein said sufficient amount of (b) is from about 0.2 percent to about 10 percent by weight of said blend.
Claim 15
Dependent Claim
13 words
A blend according to claim 12 wherein said polycarbodiimide is derived from 1,3,5-triisopropyl-2,4-diisocyanatobenzene.
Claim 16
Dependent Claim
17 words
A blend according to claim 13 wherein D in said (II) is the residue of azelaic acid.
Claim 17
Dependent Claim
7 words
An annealed blend according to claim 1.
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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) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |