Patent US4549585A successfully refreshed from Google Patents.
Patent US4918344A successfully refreshed from Google Patents.
US4880554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic blend of polycarbonate, polymethylmethacrylate and AES
Assignee: Dow Chemical Co
•
Filing: 1988-08-22
•
Granted: 1989-11-14
•
Expires: 2008-08-22
Abstract
Abstract A new polymeric composition of matter comprises an intimate blend of an aromatic polycarbonate, polymethylmethacrylate (PMMA), and a terpolymer of ethylene propylene-diene (EPDM) rubber-toughened styrene-acrylonitrile (SAN). The blend of the present invention has improved physical properties and excellent environmental stress crack resistance toward organic solvents.
Inventors
- 👤 Thomas H. Newman
- 👤 David E. Henton
- 👤 Silvia A. Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:12
CPC Classifications
C; C08; C08L; C08L51/00; C08L51/04; C08L55/00; C08L55/02; C08L69/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
33 words
The thermoplastic blend comprising: from about 40% to about 80% polycarbonate; from about 5% to about 40% of rubber-modified polymethylmethacrylate; and from about 15% to about 50% of the olefin-diene rubber-modified styrene-acrylonitrile resin.
Claim 2
Dependent Claim
33 words
The thermoplastic blend comprising: from about 40% to about 80% polycarbonate; from about 5% to about 40% of rubber-modified polymethylmethacrylate; and from about 15% to about 50% of the olefin-diene rubber-modified styrene-acrylonitrile resin.
Claim 3
Dependent Claim
15 words
The blend of claim 1, wherein the olefin-diene rubber resin comprises an ethylene-propylene-diene terpolymer elastomer.
Claim 4
Dependent Claim
26 words
The blend of claim 2, wherein the polycarbonate is an aromatic polycarbonate of a molecular weight in the range of from about 14,000 to about 50,000.
Claim 5
Dependent Claim
27 words
The blend of claim 3, wherein the polycarbonate is of the general structure ##STR3## having a weight average molecular weight of from about 20,000 to about 35,000.
Claim 6
Dependent Claim
41 words
A thermoplastic blend comprising: an aromatic polycarbonate resin of a molecular weight in the range of from about 14,000 to about 50,000; a rubber-modified polymethylmethacrylate resin comprising from about 15% to about 40% of grafted acrylate rubber; and EPDM rubber-modified styrene-acrylonitrile.
Claim 7
Dependent Claim
41 words
A thermoplastic blend comprising: an aromatic polycarbonate resin of a molecular weight in the range of from about 14,000 to about 50,000; a rubber-modified polymethylmethacrylate resin comprising from about 15% to about 40% of grafted acrylate rubber; and EPDM rubber-modified styrene-acrylonitrile.
Claim 8
Dependent Claim
23 words
The blend of claim 5, wherein the polycarbonate resin has a molecular weight in the range of from about 20,000 to about 35,000.
Claim 9
Dependent Claim
42 words
The blend of claim 6, comprising: in the range of from about 50% to about 70% polycarbonate; in the range of from about 10% to about 20% rubber-modified polymethylmethacrylate; and in the range of from about 20% to about 40% EPDM-rubber-modified styrene-acrylonitrile.
References Cited (Backward Citations)
US3130177A
Cited
GB1182807A
Cited
GB1543146A
Cited
US4419491A
Cited
US4390657A
Cited
US4515921A
Cited
US4544706A
Cited
US4704432A
Cited
US4579909A
Cited
US4579903A
Cited
US4628074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |