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US4277600A
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Tetraphenolic compounds and polycarbonates containing the same
Assignee: General Electric Co
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Filing: 1979-09-20
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Granted: 1981-07-07
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Expires: 1999-09-20
Abstract
Abstract Novel tetraphenolic compounds are disclosed. These compounds have utility as branching agents in the production of novel, randomly branched polycarbonates.
Inventors
- 👤 Victor Mark
- 👤 Charles V. Hedges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:09
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/14; C07; C07C; C07C39/00; C07C39/12; C07C39/17; C07C39/24; C07C39/42; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C49/00; C07C49/587; C07C49/703; C07C49/747; C07C2601/00; C07C2601/12; C07C2601/14; C07C2602/00; C07C2602/02; C07C2602/14; C07C2602/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
A tetraphenolic compound of the formula wherein each X substituent is independently selected from phenyl, H, Cl, Br, and C 1 to C 5 alkyl; each m and m' are integers selected independently from 0, 1, 2 and 3; and n is an integer of either 0 or 1, with the proviso that the sum of all the m and m' integers and n is at least 2, and with the further proviso that at least one of the m integers is greater than 0 and at least one of the m' integers is greater than 0.
Claim 2
Dependent Claim
97 words
A tetraphenolic compound of the formula wherein each X substituent is independently selected from phenyl, H, Cl, Br, and C 1 to C 5 alkyl; each m and m' are integers selected independently from 0, 1, 2 and 3; and n is an integer of either 0 or 1, with the proviso that the sum of all the m and m' integers and n is at least 2, and with the further proviso that at least one of the m integers is greater than 0 and at least one of the m' integers is greater than 0.
Claim 3
Dependent Claim
3 words
The compound 1,1,4,4-tetrakis(4-hydroxy-3,5-dimethylphenyl)cyclohexane.
Claim 4
Dependent Claim
3 words
The compound 1,1,4,4-tetrakis(4-hydroxy-3,5-dimethylphenyl)cyclohexane.
Claim 5
Dependent Claim
40 words
A high molecular weight, thermoplastic, randomly branched polycarbonate composition, said polycarbonate substantially free of crosslinking, based on a dihydric phenol, having an intrinsic viscosity of 0.40 to 1.00 dl/g in methylene chloride at 25° C., wherein the branching component is
Claim 6
Dependent Claim
40 words
A high molecular weight, thermoplastic, randomly branched polycarbonate composition, said polycarbonate substantially free of crosslinking, based on a dihydric phenol, having an intrinsic viscosity of 0.40 to 1.00 dl/g in methylene chloride at 25° C., wherein the branching component is
Claim 7
Dependent Claim
10 words
The composition of claim 7 wherein the branching component is
Claim 8
Dependent Claim
11 words
The composition of claim 7 wherein the branching component is 1,1,4,4-tetrakis(4-hydroxy-3-methylphenyl)cyclohexane.
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) | 1984-07-06 | 1985-01-05 | 1985-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-06 | 1989-01-05 | 1989-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-06 | 1993-01-05 | 1993-07-07 | $7700.00 | Window Closed / Lapsed |