Patent US4548997A successfully refreshed from Google Patents.
US4548997A
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Polyetherimide-polycarbonate blends
Assignee: General Electric Co
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Filing: 1984-05-22
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Granted: 1985-10-22
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Expires: 2004-05-22
Abstract
Abstract Disclosed are blends of (a) a polyetherimide and (b) a thermoplastic polycarbonate. The blends exhibit a higher heat distortion temperature and an improved flexural strength and tensile strength over the polycarbonate component alone and have a higher impact strength than that associated with the polyetherimide component of the blends. In addition, the blends may exhibit good flame resistance.
Inventors
- 👤 Gary A. Mellinger
- 👤 Harold F. Giles, Jr.
- 👤 Fred Holub
- 👤 William R. Schlich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:35
CPC Classifications
C; C08; C08L; C08L69/00; C08L79/00; C08L79/04; C08L79/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
51 words
A composition consisting essentially of a blend of (a) a polycarbonate and (b) a polyetherimide, wherein the polycarbonate consists of recurring structural units of the formula: ##STR14## wherein Y is divalent aromatic radical of a dihydric phenol selected from the group consisting of 2,2-bis(4-hydroxyphenyl)propane, bis(4-hydroxyphenyl)methane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 4,4-bis(4-hydroxyphenyl)heptane, 2,2-(3,5,3',5'-tetrachloro-4,4'-dihydroxyphenyl)propane, 2,2-(3,5,3',5'-tetrabromo-4,4'-dihydroxyphenyl)propane, and (3,3'-dichloro-4,4'-dihydroxyphenyl)methane.
Claim 2
Dependent Claim
51 words
A composition consisting essentially of a blend of (a) a polycarbonate and (b) a polyetherimide, wherein the polycarbonate consists of recurring structural units of the formula: ##STR14## wherein Y is divalent aromatic radical of a dihydric phenol selected from the group consisting of 2,2-bis(4-hydroxyphenyl)propane, bis(4-hydroxyphenyl)methane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 4,4-bis(4-hydroxyphenyl)heptane, 2,2-(3,5,3',5'-tetrachloro-4,4'-dihydroxyphenyl)propane, 2,2-(3,5,3',5'-tetrabromo-4,4'-dihydroxyphenyl)propane, and (3,3'-dichloro-4,4'-dihydroxyphenyl)methane.
Claim 3
Dependent Claim
166 words
A composition in accordance with claim 1, wherein the polyetherimide has the formula: ##STR15## where a represents a whole number in excess of 1, the group --O--A is selected from: ##STR16## R' being hydrogen, lower alkly or lower alkoxy, and Z is a member of the class consisting of (1) ##STR17## and (2) divalent organic radicals of the general formula: ##STR18## where X is a member selected from the class consisting of divalent radicals of the formulas, ##STR19## where q is 0 or 1, y is a whole number from 1 to 5, and R is a divalent organic radical selected from the class consisting of (1) aromatic hydrocarbon radicals having from 6-20 carbon atoms and halogenated derivatives thereof, (2) alkylene radicals and cycloalkylene radicals having from 2-20 carbon atoms, C.sub.(2-8) alkylene terminated polydiorganosiloxane, and (3) divalent radicals included by the formula ##STR20## where Q is a member selected from the class consisting of ##STR21## where x is a whole number from 1 to 5 inclusive.
Claim 4
Dependent Claim
33 words
A composition in accordance with claim 2 wherein the polyetherimide is of the formula: ##STR22## and the divalent bonds of the --O--Z--O-- radical are in the 3,3'; 3,4'; 4,3' or the 4,4' position.
Claim 5
Dependent Claim
17 words
A composition in accordance with claims 3, wherein Z is; ##STR23## and R is selected from: ##STR24##
Claim 6
Dependent Claim
15 words
A composition in accordance with claims 4, wherein the polyetherimide is of the formula; ##STR25##
Claim 7
Dependent Claim
21 words
A composition in accordance with claim 1 wherein the dihydric phenol is bisphenol A and the carbonate precursor is carbonyl chloride.
Claim 8
Dependent Claim
21 words
A composition in accordance with claim 1 wherein the dihydric phenol is bisphenol A and the carbonate precursor is diphenyl carbonate.
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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |