US4436876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Block copolymers of polyphenylene oxides and sterically-hindered aromatic polycarbonates
Assignee: General Electric Co
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Filing: 1982-07-21
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Granted: 1984-03-13
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Expires: 2002-07-21
Abstract
Abstract This invention relates to block copolymers of polyphenylene oxides and sterically-hindered aromatic polycarbonates. These block copolymers can be molded, calendered, or extruded as films, sheets, fibers, laminates or other useful articles of manufacture.
Inventors
- 👤 George R. Loucks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:45
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/18; C08G64/183; Y; Y10; Y10S; Y10S525/00; Y10S525/905
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
A process of forming a block copolymer of polyphenylene oxide and a sterically-hindered aromatic polycarbonate comprising the following process sequence: (1) Forming an agitated two-phase mixture comprising, (i) an organic phase containing a polyphenylene oxide, a sterically hindered aromatic dihydroxy compound, an inert organic solvent, a tertiary amine, and, optionally, a non sterically hindered aromatic dihydroxy compound, (ii) an aqueous phase containing a solution of an alkali metal hydroxide having a pH value of at least 10, (2) Adding and reacting a carbonyl halide with both the polyphenylene oxide and the sterically hindered aromatic dihydroxy compound plus any, optional non-sterically hindered aromatic dihydroxy compound to form a block copolymer, the quantity of said carbonyl halide being sufficiently large to react with all the aromatic dihydroxy compounds, and (3) Recovering the polyphenylene oxide and sterically hindered aromatic polycarbonate block copolymer.
Claim 2
Dependent Claim
139 words
A process of forming a block copolymer of polyphenylene oxide and a sterically-hindered aromatic polycarbonate comprising the following process sequence: (1) Forming an agitated two-phase mixture comprising, (i) an organic phase containing a polyphenylene oxide, a sterically hindered aromatic dihydroxy compound, an inert organic solvent, a tertiary amine, and, optionally, a non sterically hindered aromatic dihydroxy compound, (ii) an aqueous phase containing a solution of an alkali metal hydroxide having a pH value of at least 10, (2) Adding and reacting a carbonyl halide with both the polyphenylene oxide and the sterically hindered aromatic dihydroxy compound plus any, optional non-sterically hindered aromatic dihydroxy compound to form a block copolymer, the quantity of said carbonyl halide being sufficiently large to react with all the aromatic dihydroxy compounds, and (3) Recovering the polyphenylene oxide and sterically hindered aromatic polycarbonate block copolymer.
Claim 3
Dependent Claim
29 words
The claim 1 process wherein a sterically hindered aromatic hydroxy compound is present as a major portion relative to a minor portion of a non-sterically hindered aromatic dihydroxy compound.
Claim 4
Dependent Claim
18 words
The claim 2 process wherein the sterically hindered aromatic dihydroxy compound portion is at least 90 mol percent.
Claim 5
Dependent Claim
20 words
The claim 3 process wherein the polyphenylene oxide is poly(2,6-dimethyl-1,4-phenylene oxide) and the sterically hindered aromatic dihydroxy compound is bis(4-hydroxy-3,5-dimethylphenyl)propane-2,2.
Claim 6
Dependent Claim
18 words
The claim 4 process wherein the alkali metal hydroxide is sodium hydroxide and the tertiary amine is triethylamine.
Claim 7
Dependent Claim
11 words
The claim 5 process wherein a phase transfer agent is present.
References Cited (Backward Citations)
US3342892A
Cited
US3875256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |