US4806589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly(alkylene terephthalate) compositions having improved crystallization rate and properties
Assignee: Dow Chemical Co
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Filing: 1987-08-10
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Granted: 1989-02-21
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Expires: 2007-08-10
Abstract
Abstract Disclosed are homogeneous blends comprising (a) a poly(alkylene terephthalate) and (b) a sufficient amount of a crystalline polyamide to impart enhanced crystallization velocity to said polyalkylene terephthalate. The crystalline polyamide comprises a narrow class of aromatic-aliphatic polyamides prepared from 4,4'-methylenebis(phenyl isocyanate) and a small group of aliphatic dicarboxylic acids. the poly(alkylene terephthalates) are characterized by enhanced crystallization rates which lead to a number of improved properties over the base polyester.
Inventors
- 👤 Augustin T. Chen
- 👤 Kemal Onder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:16
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
76 words
A fluxed homogeneous polymer blend comprising (a) a poly(alkylene terephthalate) and (b) a sufficient amount of a crystalline polyamide to impart enhanced crystallization velocity to said polyalkylene terephthalate said (b) being a linear polyamide selected from the group consisting of poly(4,4'-methylenediphenylene azelamide), poly(4,4'-methylenediphenylene sebacamide), poly(4,4'-methylenediphenylene undecanediamide), poly(4,4'-methylenediphenylene dodecanediamide), and mixtures thereof and being further characterized in that it has been prepared by the reaction of monomers consisting essentially of 4,4'-methylenebis(phenyl isocyanate) and the corresponding dicarboxylic acid.
Claim 2
Dependent Claim
76 words
A fluxed homogeneous polymer blend comprising (a) a poly(alkylene terephthalate) and (b) a sufficient amount of a crystalline polyamide to impart enhanced crystallization velocity to said polyalkylene terephthalate said (b) being a linear polyamide selected from the group consisting of poly(4,4'-methylenediphenylene azelamide), poly(4,4'-methylenediphenylene sebacamide), poly(4,4'-methylenediphenylene undecanediamide), poly(4,4'-methylenediphenylene dodecanediamide), and mixtures thereof and being further characterized in that it has been prepared by the reaction of monomers consisting essentially of 4,4'-methylenebis(phenyl isocyanate) and the corresponding dicarboxylic acid.
Claim 3
Dependent Claim
13 words
A blend according to claim 1 wherein said polyalkylene terephthalate is polyethylene terephthalate.
Claim 4
Dependent Claim
13 words
A blend according to claim 1 wherein said polyalkylene terephthalate is polycyclohexylenedimethylene terephthalate.
Claim 5
Dependent Claim
35 words
A blend according to claim 1 wherein the proportions of said crystalline polyamide falls in a range of from about 5 to about 50 percent by weight based on combined weight of (a) and (b).
Claim 6
Dependent Claim
26 words
A blend according to claim 1 additionally comprising from about 5 to about 60 percent by weight based on total blend weight of a reinforcing material.
Claim 7
Dependent Claim
26 words
A blend according to claim 1 additionally comprising from about 5 to about 60 percent by weight based on total blend weight of fiber glass reinforcement.
Claim 8
Dependent Claim
90 words
A fluxed homogeneous polymer blend comprising (a) from about 50 to about 85 percent by weight of a poly(alkylene terephthalate) selected from the group consisting of polyethylene terephthalate and polycyclohexylenedimethylene terephthalate; and (b) from about 15 to about 50 percent by weight of a crystalline polyamide selected from the group consisting of poly(4,4'-methylenediphenylene azelamide), poly(4,4'-methylenediphenylene sebacamide), poly(4,4'-methylenediphenylene undecanediamide), poly(4,4'-methylenediphenylene dodecanediamide) and mixtures thereof and said polyamide being further characterized in that it has been prepared by the reaction of monomers consisting essentially of 4,4'-methylenebis(phenyl isocyanate) and the corresponding dicarboxylic acid.
Claim 9
Dependent Claim
90 words
A fluxed homogeneous polymer blend comprising (a) from about 50 to about 85 percent by weight of a poly(alkylene terephthalate) selected from the group consisting of polyethylene terephthalate and polycyclohexylenedimethylene terephthalate; and (b) from about 15 to about 50 percent by weight of a crystalline polyamide selected from the group consisting of poly(4,4'-methylenediphenylene azelamide), poly(4,4'-methylenediphenylene sebacamide), poly(4,4'-methylenediphenylene undecanediamide), poly(4,4'-methylenediphenylene dodecanediamide) and mixtures thereof and said polyamide being further characterized in that it has been prepared by the reaction of monomers consisting essentially of 4,4'-methylenebis(phenyl isocyanate) and the corresponding dicarboxylic acid.
Claim 10
Dependent Claim
26 words
A blend according to claim 7 additionally comprising from about 5 to about 60 percent by weight based on total blend weight of fiber glass reinforcement.
Claim 11
Dependent Claim
12 words
A blend according to claim 7 wherein said polyamide is poly(4,4'-methylenediphenylene dodecanediamide).
Claim 12
Dependent Claim
12 words
A blend according to claim 7 wherein said polyamide is poly(4,4'-methylenediphenylene azelamide).
Claim 13
Dependent Claim
17 words
A blend according to claim 10 additionally comprising about 30 percent by weight of fiber glass reinforcement.
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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) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |