Patent US4269964A successfully refreshed from Google Patents.
US4269964A
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Polycarbonates with alkylphenyl end groups, their preparation and their use
Assignee: Bayer AG
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Filing: 1979-09-14
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Granted: 1981-05-26
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Expires: 1999-09-14
Abstract
Abstract This development is concerned with aromatic thermoplastic polycarbonates with special chain terminators which give the polymers enhanced hydrolysis resistance and impact toughness. These chain terminators are alkyl substituted monohydroxy phenyls in which each phenyl is substituted by one alkyl group having 8 or 9 carbon atoms and about 47 to 89% of its hydrogen atoms trisubstituted on carbon atoms with up to about 20% of the substituents in the ortho position and the balance at the para position. This development is also concerned with a process for synthesizing such polymers by using such chain terminators as reactants in generically known synthesis methods for polycarbonates.
Inventors
- 👤 Dieter Freitag
- 👤 Werner Nouvertne
- 👤 Claus Burkhardt
- 👤 Frank Kleiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:07
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/14
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
125 words
A thermoplastic aromatic polycarbonate with a molecular weight Mw (weight average) of about 10,000 to 200,000, which is based on at least one diphenol and, if appropriate, a branching agent, characterized in that it is also based on at least one phenolic chain stopper of the general formula ##STR3## in which R represents a branched alkyl radical consisting of 8 or 9 C atoms, and, in the alkyl radical, the proportion of CH 3 protons is between about 47% and 89% and the proportion of the sum of the CH and CH 2 protons is between about 53% and 11%, and wherein R can be in the o-position or p-position relative to the OH group, the upper limit of the ortho proportion being about 20%.
Claim 2
Dependent Claim
125 words
A thermoplastic aromatic polycarbonate with a molecular weight Mw (weight average) of about 10,000 to 200,000, which is based on at least one diphenol and, if appropriate, a branching agent, characterized in that it is also based on at least one phenolic chain stopper of the general formula ##STR3## in which R represents a branched alkyl radical consisting of 8 or 9 C atoms, and, in the alkyl radical, the proportion of CH 3 protons is between about 47% and 89% and the proportion of the sum of the CH and CH 2 protons is between about 53% and 11%, and wherein R can be in the o-position or p-position relative to the OH group, the upper limit of the ortho proportion being about 20%.
Claim 3
Dependent Claim
17 words
A polycarbonate according to claim 1 characterized by a molecular weight Mw of about 20,000 to 80,000.
Claim 4
Dependent Claim
38 words
A polycarbonate according to claim 1, characterized in that it is based on a diphenol of the general formula HO--Z--OH (II) in which Z represents a divalent mononuclear or polynuclear aromatic radical, containing 6 to 30 carbon atoms.
Claim 5
Dependent Claim
37 words
A polycarbonate according to claim 3 characterized in that the diphenol is selected from hydroquinone, resorcinol, dihydroxydiphenyls, bis-(hydroxyphenyl)-alkanes, bis-(hydroxyphenyl)-cycloalkanes, bis-(hydroxyphenyl) sulphides, bis-(hydroxyphenyl) ethers, bis-(hydroxyphenyl) ketones, bis-(hydroxyphenyl) sulphoxides bis-(hydroxyphenyl) sulphones and α,α'-bis-(hydroxyphenyl)-diisopropylbenzenes, and their nuclear-alkylated and nuclear-halogenated compounds.
Claim 6
Dependent Claim
54 words
A polycarbonate according to any of claims 1, 2 or 3 characterized in that it is based on, as a branching agent, a compound containing 3 or more functional groups in the molecule, the said compound being present in an amount of about 0.05 to 2 mol percent, relative to the content of diphenol.
Claim 7
Dependent Claim
26 words
A polycarbonate according to any of claims 1, 2 or 3, characterized in that the chain stopper is selected from 2-(3,5-dimethylheptyl)-phenol, 4-(3,5-dimethylheptyl)-phenol, 4-(1,1,3,3-tetramethyl-butyl)-phenol and mixtures thereof.
Claim 8
Dependent Claim
64 words
In the phase boundary process for the preparation of a thermoplastic aromatic polycarbonate with a molecular weight Mw of at least about 10,000 the improvement wherein at least one diphenol, optionally a branching agent and about 0.1 mol % to 8 mol %, relative to the amount of diphenol, of a phenolic chain stopper of the formula (I), given in claim 1, are reacted.
Claim 9
Dependent Claim
24 words
A process according to claim 7, characterized in that the diphenol is employed in the form of a mono- and/or bis-chlorocarbonic acid ester thereof.
Claim 10
Dependent Claim
22 words
A process according to claim 7 or 8, characterized in that the reaction is effected at from about 0° to 40° C.
Claim 11
Dependent Claim
26 words
A process according to claim 7 or 8, characterized in that the organic phase of the reaction medium is methylene chloride, chlorobenzene or a mixture thereof.
Claim 12
Dependent Claim
25 words
A process according to claim 7 or 8, characterized in that the reaction is effected in the presence, as a catalyst, of a tertiary amine.
Claim 13
Dependent Claim
29 words
A process according to claim 11, characterized in that the catalyst is employed in an amount of about 0.05 to 10 mol % relative to the amount of diphenol.
Claim 14
Dependent Claim
29 words
A process according to claim 7 or 8, characterized in that about 0.1 to 5 mol % of phenolic chain stopper is employed, relative to the amount of diphenol.
Claim 15
Dependent Claim
11 words
A polycarbonate prepared by the process of claim 7 or 8.
References Cited (Backward Citations)
US3080342A
Cited
US3177179A
Cited
US3214405A
Cited
US3544514A
Cited
US4001183A
Cited
US3897392A
Cited
US3931108A
Cited
US4185009A
Cited
US4196276A
Cited
US4174437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |