US3897392A
Expired / Lapsed
US
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Branched aromatic polycarbonates
Assignee: Bayer AG
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Filing: 1973-10-23
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Granted: 1975-07-29
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Expires: 1993-10-23
Abstract
Abstract Thermoplastic branched aromatic polycarbonates and novel orthoester branching agents. The polycarbonates may be characterized by structural elements of the formula
Inventors
- 👤 Heinrich Haupt
- 👤 Dieter Freitag
- 👤 Hugo Vernaleken
- 👤 Kuno Wagner
- 👤 Kurt Findeisen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:38
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
50 words
THERMOPLASTIC BRANCHED POLYCARBONATES CONSISTING ESSENTIALLY OF THE REACTION PRODUCTS OF AROMATIC DIHYDROXY COMPOUNDS AND ORTHO-ARYL ESTERS OF CARBONIC ACID OR OF MONOCARBOXYLIC ACIDS OR DICARBOXYLIC ACIDS WITH POLYCARBONATE PERCURSORS WHEREIN THE OTHO-ARYL ESTERS ARE REACTED IN AMOUNTS OF 0.01 TO 5 MOL PERCENT RELATIVE TO THE AMOUNT OF DIHYDROXY COMPOUND.
Claim 2
Dependent Claim
50 words
THERMOPLASTIC BRANCHED POLYCARBONATES CONSISTING ESSENTIALLY OF THE REACTION PRODUCTS OF AROMATIC DIHYDROXY COMPOUNDS AND ORTHO-ARYL ESTERS OF CARBONIC ACID OR OF MONOCARBOXYLIC ACIDS OR DICARBOXYLIC ACIDS WITH POLYCARBONATE PERCURSORS WHEREIN THE OTHO-ARYL ESTERS ARE REACTED IN AMOUNTS OF 0.01 TO 5 MOL PERCENT RELATIVE TO THE AMOUNT OF DIHYDROXY COMPOUND.
Claim 3
Dependent Claim
25 words
The polycarbonates of claim 1 wherein the aromatic dihydroxy compounds are selected from the group consisting of: 2,2-bis-(4-Hydroxyphenyl)-propane; 2,2-bis-(4-hydroxy-3,5-dibromophenyl)-propane; 2,2-bis-(4-hydroxy-3,5-dichlorophenyl)-propane and Alpha , Alpha ''-bis-(4-hydroxyphenyl)-p-diisopropylbenzene.
Claim 4
Dependent Claim
30 words
The polycarbonates of claim 1 wherein the ortho-aryl esters are selected from the group consisting of ortho-phenyl carbonate, benzoic-acid ortho-phenyl ester; terephthalic acid ortho-phenyl ester and isophthalic acid ortho-phenyl ester.
Claim 5
Dependent Claim
25 words
Thermoplastic branched polycarbonates consisting essentially of the reaction products of polycarbonate precursors with aromatic dihydroxy compounds and ortho-ester branching agents of the formula (HO-D-O)3C-X where
Claim 6
Dependent Claim
25 words
Thermoplastic branched polycarbonates consisting essentially of the reaction products of polycarbonate precursors with aromatic dihydroxy compounds and ortho-ester branching agents of the formula (HO-D-O)3C-X where
Claim 7
Dependent Claim
9 words
Aromatic polycarbonates of the general formula (1) -R''(O-D-O-CO-)n-O-D-O)3C-X''; wherein
Claim 8
Dependent Claim
9 words
Aromatic polycarbonates of the general formula (1) -R''(O-D-O-CO-)n-O-D-O)3C-X''; wherein
Claim 9
Dependent Claim
8 words
The polycarbonates of claim 5 wherein X'' -O-D-O(-CO-O-D-O)n''R
Claim 10
Dependent Claim
67 words
In a process for the manufacture of branched thermoplastic polycarbonates wherein aromatic dihydroxy compounds are transesterified with diaryl carbonates in the presence of branching agents, the improvement comprising employing as the branching agents, ortho-aryl esters of carbonic acid or of monocarboxylic acids or dicarboxylic acids wherein the ortho-aryl esters are reacted in amounts of 0.01 to 5 mol percent based on the amount of aromatic dihydroxy compound.
Claim 11
Dependent Claim
67 words
In a process for the manufacture of branched thermoplastic polycarbonates wherein aromatic dihydroxy compounds are transesterified with diaryl carbonates in the presence of branching agents, the improvement comprising employing as the branching agents, ortho-aryl esters of carbonic acid or of monocarboxylic acids or dicarboxylic acids wherein the ortho-aryl esters are reacted in amounts of 0.01 to 5 mol percent based on the amount of aromatic dihydroxy compound.
Claim 12
Dependent Claim
75 words
In the phase boundary condensation process for manufacturing branched thermoplastic polycarbonates wherein aromatic dihydroxy compounds and branching agents are dissolved in aqueous sodium hydroxide solution and reacted thereafter with phosgene, the improvement comprising employing as the branching agents 0.01 to 5 mol percent, relative to the total amounts of dihydroxy compounds employed, of oRthoesters of carbonic acid or of monocarboxylic or dicarboxylic acids with aromatic dihydroxy compounds only one hydroxyl group of which is esterified.
Claim 13
Dependent Claim
75 words
In the phase boundary condensation process for manufacturing branched thermoplastic polycarbonates wherein aromatic dihydroxy compounds and branching agents are dissolved in aqueous sodium hydroxide solution and reacted thereafter with phosgene, the improvement comprising employing as the branching agents 0.01 to 5 mol percent, relative to the total amounts of dihydroxy compounds employed, of oRthoesters of carbonic acid or of monocarboxylic or dicarboxylic acids with aromatic dihydroxy compounds only one hydroxyl group of which is esterified.
Claim 14
Dependent Claim
25 words
The aromatic polycarbonates of claim 5 wherein n and n'' are identical or different and each have any integer value from 10 to 50 inclusive.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |