US5260379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester blends with improved processability
Assignee: Eastman Chemical Co
•
Filing: 1991-09-13
•
Granted: 1993-11-09
•
Expires: 2011-09-13
Abstract
Abstract This invention relates to an injection molding composition having a melt viscosity lower than about 2000 poise at 1500/sec. shear rate at a temperature of about 275° C., and an excellent stiffness of at least 200,000 psi, comprising: from about 10 to about 90% of a polyester comprising repeat units from terephthalic acid, ethylene glycol, and 1,4-cyclohexanedimethanol, and from about 10 to about 90% styrene copolymer comprising repeat units from about 5 to about 35 mole percent of methyl methacrylate.
Inventors
- 👤 Dale M. Blakely
- 👤 Robert W. Seymour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:23
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L25/14; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
An injection molding composition having a melt viscosity lower than about 2000 poise at 1500/sec. shear rate at a temperature of about 275° C., and an excellent stiffness of at least 200,000 psi, comprising: from about 10 to about 90% of a polyester comprising repeat units from terephthalic acid, ethylene glycol, and 1,4-cyclohexanedimethanol, and from about 10 to about 90% styrene copolymer consisting of repeat units of styrene and from about 5 to about 35 mole percent of methyl methacrylate.
Claim 2
Dependent Claim
80 words
An injection molding composition having a melt viscosity lower than about 2000 poise at 1500/sec. shear rate at a temperature of about 275° C., and an excellent stiffness of at least 200,000 psi, comprising: from about 10 to about 90% of a polyester comprising repeat units from terephthalic acid, ethylene glycol, and 1,4-cyclohexanedimethanol, and from about 10 to about 90% styrene copolymer consisting of repeat units of styrene and from about 5 to about 35 mole percent of methyl methacrylate.
Claim 3
Dependent Claim
32 words
The composition of claim 1 wherein the glycol compound is from about 15 to about 85 mole percent of ethylene glycol and from about 15 to about 85 mole percent of cyclohexanedimethanol.
Claim 4
Dependent Claim
20 words
The composition of claim 1 wherein the inherent viscosity of the polyester is from about 0.5 to about 1.0 dl/g.
Claim 5
Dependent Claim
20 words
The composition of claim 1 wherein the inherent viscosity of the polyester is from about 0.7 to about 0.8 dl/g.
Claim 6
Dependent Claim
13 words
The composition of claim 1 wherein the polyester is copoly (25-35/75-65 1,4-cyclohexylenedimethylene/ethylene terephthalate.
Claim 7
Dependent Claim
13 words
The composition of claim 1 wherein the polyester is copoly (58-68/42-32 1,4-cyclohexylenedimethylene/ethylene terephthalate.
References Cited (Backward Citations)
US3047539A
Cited
US3290411A
Cited
US3728212A
Cited
US4256681A
Cited
US4539290A
Cited
US4985501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |