US4897448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester/polycarbonate blends
Assignee: Eastman Chemical Co
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Filing: 1988-04-01
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Granted: 1990-01-30
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Expires: 2008-04-01
Abstract
Abstract An impact modified polyester-polycarbonate blend, comprising: 1. 20-45 wt % of a poly(ethylene terephthalate) resin, 2. 20-50 wt % of a poly(cyclohexylene dimethylene terephthalate) resin, 3. 10-50 wt % of a polycarbonate, and 4. 8-20 wt % of an impact modifier, wherein the notched Izod impact strength of said blend is greater than 2.0 ft-lb/in. at -40 DEG C. and greater than 18.5 ft-lb/in. at 23 DEG C.
Inventors
- 👤 Kenneth A. Romance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:40
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
101 words
An impact modified polyester-polycarbonate blend, comprising: (a) 20-45 wt% of a poly(ethylene terephthalate) resin, (b) 20-50 wt% of polyester resin, the dicarboxylic acid component of which consists essentially of terephthalic acid and the glycol component of which consists of 1,4-cyclohexane-dimethanol, (c) 10-50 wt% of a polycarbonate, and (d) 8-20 wt% of an impact modifier selected from the group consisting of ethylene-propylene rubbers and acrylic core-shell polymers, wherein the notched Izod impact strength of said blend is greater than 2.0 ft-lb/in. at -40° C. and greater than 18.5 ft-lb/in. at 23° C. as measured by ASTM D256 using 1/8 inch molded bars.
Claim 2
Dependent Claim
101 words
An impact modified polyester-polycarbonate blend, comprising: (a) 20-45 wt% of a poly(ethylene terephthalate) resin, (b) 20-50 wt% of polyester resin, the dicarboxylic acid component of which consists essentially of terephthalic acid and the glycol component of which consists of 1,4-cyclohexane-dimethanol, (c) 10-50 wt% of a polycarbonate, and (d) 8-20 wt% of an impact modifier selected from the group consisting of ethylene-propylene rubbers and acrylic core-shell polymers, wherein the notched Izod impact strength of said blend is greater than 2.0 ft-lb/in. at -40° C. and greater than 18.5 ft-lb/in. at 23° C. as measured by ASTM D256 using 1/8 inch molded bars.
Claim 3
Dependent Claim
27 words
The blend of claim 1, wherein said impact modifier has a Tg below -25° C. as measured by dynamic mechanical spectroscopy at a frequency at 0.3 Hz.
Claim 4
Dependent Claim
16 words
The blend of claim 1, wherein said ethylene/propylene rubber has an ethylene/propylene ratio of about 1:1.
Claim 5
Dependent Claim
17 words
The blend of claim 1, wherein said ethylene/propylene rubber further comprises repeat unit from a diene monomer.
Claim 6
Dependent Claim
21 words
The blend of claim 4, wherein said diene monomer is selected from the group consisting of ethylidene norbornene, dicyclopentadiene and hexadiene.
Claim 7
Dependent Claim
22 words
The blend of claim 1, wherein said poly(cyclohexylene dimethylene terephthalate) resin and said poly(ethylene terephthalate) resin have an inherent viscosity of 0.4-1.0.
Claim 8
Dependent Claim
11 words
The blend of claim 6, wherein said inherent viscosity is 0.6-0.8.
Claim 9
Dependent Claim
11 words
The blend of claim 1, wherein said polycarbonate is a bisphenol--A--polycarbonate.
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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) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |