US4699971A
Expired / Lapsed
US
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Polycarbonate with cycloalkylphenyl end group
Assignee: General Electric Co
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Filing: 1985-11-12
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Granted: 1987-10-13
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Expires: 2005-11-12
Abstract
Abstract Thermoplastic aromatic polycarbonate containing the polymerized reaction products of (i) at least one dihydric phenol, (ii) a carbonate precursor, and (iii) at least one end-capping agent represented by the formula ##STR1## wherein: R is independently selected from alkyl radicals; Z is a cycloalkyl radical; and n is an integer having a value of from 0 to 4 inclusive.
Inventors
- 👤 Victor Mark, deceased
- 👤 legal representative Ester H. Mark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:30
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
50 words
An aromatic polycarbonate containing at least one terminal group represented by the formula ##STR16## wherein: R is independently selected from alkyl radicals; Z represents a cycloalkyl radical containing from 12 to about 16 ring carbon atoms; and n is an integer having a value of from 0 to 4 inclusive.
Claim 2
Dependent Claim
50 words
An aromatic polycarbonate containing at least one terminal group represented by the formula ##STR16## wherein: R is independently selected from alkyl radicals; Z represents a cycloalkyl radical containing from 12 to about 16 ring carbon atoms; and n is an integer having a value of from 0 to 4 inclusive.
Claim 3
Dependent Claim
13 words
The polycarbonate of claim 1 wherein said cycloalkyl radical is the cyclododecyl radical.
Claim 4
Dependent Claim
15 words
The polycarbonate of claim 1 wherein said terminal group is represented by the formula ##STR17##
Claim 5
Dependent Claim
11 words
The polycarbonate of claim 3 wherein said cycloalkyl radical is cyclododecyl.
Claim 6
Dependent Claim
9 words
The polycarbonate of claim 4 wherein n is zero.
Claim 7
Dependent Claim
35 words
The polycarbonate of claim 1 which is comprised of the polymerized reaction products of (i) at least one dihydric phenol, (ii) a carbonate precursor, and (iii) an end-capping agent represented by the general formula ##STR18##
Claim 8
Dependent Claim
11 words
The polycarbonate of claim 8 wherein said carbonate precursor is phosgene.
Claim 9
Dependent Claim
11 words
The polycarbonate of claim 7 wherein said dihydric phenol is bisphenol-A.
Claim 10
Dependent Claim
15 words
The polycarbonate of claim 6 wherein said end-capping agent is represented by the formula ##STR19##
Claim 11
Dependent Claim
11 words
The polycarbonate of claim 9 wherein said cycloalkyl radical is cyclododecyl.
Claim 12
Dependent Claim
9 words
The polycarbonate of claim 10 wherein n is zero.
Claim 13
Dependent Claim
11 words
The polycarbonate of claim 11 wherein said carbonate precursor is phosgene.
Claim 14
Dependent Claim
11 words
The polycarbonate of claim 12 wherein said dihydric phenol is bisphenol-A.
References Cited (Backward Citations)
US3240756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |