US3839247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-clear hydrolytically stable polycarbonate composition containing an aromatic or aliphatic epoxy stabilizer
Assignee: General Electric Co
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Filing: 1973-12-26
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Granted: 1974-10-01
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Expires: 1993-12-26
Abstract
Abstract An improved water clear polycarbonate composition consisting in admixture an aromatic polycarbonate and a stabilizing amount of a particular epoxy compound which may be either an aromatic epoxy or an aliphatic epoxy compound and mixtures thereof.
Inventors
- 👤 C Bialous
- 👤 G Macke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:16
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1515; C08L; C08L69/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
75 words
AN IMPROVED WATER CLEAR POLYCARBONATE COMPOSITION WHICH IS THE REACTION PRODUCT OF A DIHYDRIC PHENOL AND CARBONATE PRECURSOR AND WHICH COMPOSITION I RESISTANT TO HYDROLYSIS WHEN EXPOSED TO ELEVATED TEMPERATURES AND WATER, WHEREIN THE IMPROVEMENT COMPRISES HAVING IN ADMIXTURE WITH THE POLYCARBONATE A STABILIZING AMOUNT OF A PARTICULAR EPOXY COMPOUND BASED ON THE WEIGHT OF THE POLYCARBONATE; SAID PARTICULAR EPOXY BEING SELECTED FROM THE GROUP CONSISTING OF AROMATIC EPOXIES AND ALIPHATIC EPOXIES, AND MIXTURES THEREOF.
Claim 2
Dependent Claim
75 words
AN IMPROVED WATER CLEAR POLYCARBONATE COMPOSITION WHICH IS THE REACTION PRODUCT OF A DIHYDRIC PHENOL AND CARBONATE PRECURSOR AND WHICH COMPOSITION I RESISTANT TO HYDROLYSIS WHEN EXPOSED TO ELEVATED TEMPERATURES AND WATER, WHEREIN THE IMPROVEMENT COMPRISES HAVING IN ADMIXTURE WITH THE POLYCARBONATE A STABILIZING AMOUNT OF A PARTICULAR EPOXY COMPOUND BASED ON THE WEIGHT OF THE POLYCARBONATE; SAID PARTICULAR EPOXY BEING SELECTED FROM THE GROUP CONSISTING OF AROMATIC EPOXIES AND ALIPHATIC EPOXIES, AND MIXTURES THEREOF.
Claim 3
Dependent Claim
16 words
The composition of claim 1 wherein the aliphatic epoxy compound is represented by the following formula:
Claim 4
Dependent Claim
30 words
The composition of claim 1 wherein the aromatic epoxy is selected from the group consisting of aromatic glycidyl ether, aromatic diglycidyl ether and aromatic polyglycidyl ether containing 1-3 aromatic rings.
Claim 5
Dependent Claim
13 words
The composition of claim 1 wherein the aliphatic epoxy is epoxidized soybean oil.
Claim 6
Dependent Claim
13 words
The composition of claim 1 wherein the aromatic epoxy is bisphenol-A diglycidyl ether.
References Cited (Backward Citations)
US3489716A
Cited
US3634312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |