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US4444978A
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Thermally stable carbonate polymer
Assignee: Dow Chemical Co
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Filing: 1983-07-29
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Granted: 1984-04-24
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Expires: 2003-07-29
Abstract
Abstract Carbonate polymers having increased thermal stability are prepared by incorporating into the polymer chain an oligomer having the formula ##STR1## wherein R is the divalent residue of a dihydric phenol or a dihydric polynuclear phenol, R 1 is an alkyl, aralkyl or alkaryl group having 1 to 25 carbons, and n is a number having an average value of 1-200.
Inventors
- 👤 Kevin F. Dick
- 👤 David R. Near
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:23
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/083; C08G64/20; C08G64/22; C08G64/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
68 words
A carbonate polymer with improved thermal stability having a thermally effective amount of a phosphorous modified phenolic oligomer copolymerized therewith wherein the oligomer has the formula ##STR8## where R is the divalent residue of a dihydric mononuclear phenol or a dihydric polynuclear phenol, R 1 is an alkyl, aralkyl or alkaryl group having 1 to 25 carbons, and n is a number having an average value of 1-200.
Claim 2
Dependent Claim
68 words
A carbonate polymer with improved thermal stability having a thermally effective amount of a phosphorous modified phenolic oligomer copolymerized therewith wherein the oligomer has the formula ##STR8## where R is the divalent residue of a dihydric mononuclear phenol or a dihydric polynuclear phenol, R 1 is an alkyl, aralkyl or alkaryl group having 1 to 25 carbons, and n is a number having an average value of 1-200.
Claim 3
Dependent Claim
64 words
The carbonate polymer of claim 1 wherein R is the divalent residue of a dihydric mononuclear phenol having the formula ##STR9## X is independently hydrogen, chlorine, bromine, fluorine, or a monovalent hydrocarbon radical selected from the group consisting of an alkyl group of 1-4 carbons, an aryl group of 6-8 carbons, an oxyalkyl group of 1-4 carbons or an oxyaryl group of 6-8 carbons.
Claim 4
Dependent Claim
23 words
The carbonate polymer of claim 2 wherein said mononuclear phenol is selected from the group consisting of xylene glycol, resorcinol, hydroquinone, and catechol.
Claim 5
Dependent Claim
84 words
The carbonate polymer of claim 1 whereinR is the divalent residue of a dihydric polynuclear phenol having the formula ##STR10## where A is a single bond, a divalent hydrocarbon radical containing 1-15 carbon atoms, ##STR11## X is independently hydrogen, chlorine, bromine, fluorine, or a monovalent hydrocarbon radical selected from the group consisting of an alkyl group of 1-4 carbons, an aryl group of 6-8 carbons, an oxyalkyl group of 1-4 carbons or an oxyaryl group of 6-8 carbons and n is 0 or 1.
Claim 6
Dependent Claim
21 words
The polymer of claim 1 wherein said effective amount is 10 to 2000 parts per million based on the polymer weight.
Claim 7
Dependent Claim
59 words
A carbonate polymer with improved thermal stability having a thermally effective amount of a phosphorous modified bisphenol A oligomer copolymerized therewith wherein the oligomer has the formula ##STR12## where R 1 is a mixture of C 12 -C 15 alkyl groups, n has an average value from 1 to 10, and R is the divalent rasidue of bisphenol A.
Claim 8
Dependent Claim
59 words
A carbonate polymer with improved thermal stability having a thermally effective amount of a phosphorous modified bisphenol A oligomer copolymerized therewith wherein the oligomer has the formula ##STR12## where R 1 is a mixture of C 12 -C 15 alkyl groups, n has an average value from 1 to 10, and R is the divalent rasidue of bisphenol A.
Claim 9
Dependent Claim
21 words
The polymer of claim 6 wherein said effective amount is 10 to 2000 parts per million based on the polymer weight.
Claim 10
Dependent Claim
14 words
The carbonate polymer of claim 6 wherein the polymer is a bisphenol A polycarbonate.
Claim 11
Dependent Claim
12 words
The carbonate polymer of claim 6 wherein the polymer is a polyestercarbonate.
References Cited (Backward Citations)
US3378523A
Cited
US3578634A
Cited
US4054552A
Cited
US3766139A
Cited
US3880799A
Cited
US4156663A
Cited
US4123420A
Cited
US4223104A
Cited
US4322520A
Cited
US4401802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |