Patent US4894423A successfully refreshed from Google Patents.
US4894423A
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Environmental stress failure resistant polycarbonate
Assignee: Dow Chemical Co
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Filing: 1988-11-07
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Granted: 1990-01-16
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Expires: 2008-11-07
Abstract
Abstract Environmental stress failure resistant and impact resistant polycarbonates useful for producing molded plastic components are prepared from an aromatic polycarbonate and a copolymer of ethylene and carbon monoxide.
Inventors
- 👤 Hani Farah
- 👤 Chai J. Chou
- 👤 Stephen M. Hoenig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:19
CPC Classifications
C; C08; C08L; C08L69/00; C08L73/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
18 words
A thermoplastic molding composition, comprising: A. an aromatic polycarbonate; and B. a copolymer of ethylene and carbon monoxide.
Claim 2
Dependent Claim
18 words
A thermoplastic molding composition, comprising: A. an aromatic polycarbonate; and B. a copolymer of ethylene and carbon monoxide.
Claim 3
Dependent Claim
74 words
The thermoplastic molding composition of claim 1, wherein the aromatic polycarbonate is characterized at least in part by repeated units corresponding to the general formula: ##STR2## wherein X is a divalent C 1 -C 15 hydrocarbon radical, a single bond, --O--, --S--, --S 2 --, --SO--, --SO 2 --, or --CO--, and further wherein each aromatic ring may optionally contain 1 or 2 C 1 -C 4 alkyl hydrocarbon radical or halo radical substituents.
Claim 4
Dependent Claim
20 words
The thermoplastic molding composition of claim 2, wherein the aromatic polycarbonate is prepared at least in part from Bisphenol A.
Claim 5
Dependent Claim
25 words
The thermoplastic molding composition of claim 1, wherein the copolymer of ethylene and carbon monoxide comprises about 0.1% to about 50% by weight carbon monoxide.
Claim 6
Dependent Claim
25 words
The thermoplastic molding composition of claim 4, wherein the copolymer of ethylene and carbon monoxide comprises about 2% to about 15% by weight carbon monoxide.
Claim 7
Dependent Claim
27 words
The thermoplastic molding composition of claim 1, wherein the aromatic polycarbonate comprises about 50% to about 95% of the composition, based upon the total weight of polymers.
Claim 8
Dependent Claim
27 words
The thermoplastic molding composition of claim 6, wherein the aromatic polycarbonate comprises about 75% to about 95% of the composition, based upon the total weight of polymers.
Claim 9
Dependent Claim
31 words
The thermoplastic molding composition of claim 1, wherein the copolymer of ethylene and carbon monoxide comprises about 5% to about 50% of the composition, based upon the total weight of polymers.
Claim 10
Dependent Claim
31 words
The thermoplastic molding composition of claim 8, wherein the copolymer of ethylene and carbon monoxide comprises about 5% to about 25% of the composition, based upon the total weight of polymers.
Claim 11
Dependent Claim
13 words
The thermoplastic molding composition of claim 1, further comprising an elastomeric impact modifier.
Claim 12
Dependent Claim
35 words
The thermoplastic molding composition of claim 10, wherein the elastomeric impact modifier is selected from the group consisting of acrylonitrile-butadiene-styrene copolymers, methylmethacrylate-butadiene-styrene copolymers, hydrogenated styrene-butadiene copolymers, functionalized EPDM copolymers, acrylic latexes, polybutadiene, polyisoprene and polybutene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |