US4026913A
Expired / Lapsed
US
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Cyanic acid esters of aromatic polycarbonates
Assignee: Mitsubishi Gas Chemical Co Inc
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Filing: 1976-03-25
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Granted: 1977-05-31
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Expires: 1996-03-25
Abstract
Abstract A novel cyanic acid ester of an aromatic polycarbonate can be prepared by reacting an aromatic polycarbonate having one or two terminal hydroxyl groups with a cyanogen halide in an inert solvent at a temperature of -30° to +65° C in the presence of a base. Said cyanic acid ester and an admixture of said cyanic acid ester with other known cyanic acid ester, both of which may or may not contain a catalyst and/or other polymers are available for a coating material, a casting material, an adhesive or a molding material. When said cyanic acid ester or said admixture is cured, there is obtained a laminate, a film or a molded article. The cured products are rich in flexibility.
Inventors
- 👤 Mineaki Tanigaichi
- 👤 Morio Gaku
- 👤 Kazuyuki Ohya
- 👤 Susumu Motoori
- 👤 Kazuo Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:19
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/42; C08G64/04; C08G64/06
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
84 words
A cyanic acid ester of an aromatic polycarbonate obtained by reacting an aromatic polycarbonate having one or two terminal hydroxyl groups and prepared from an aromatic dihydroxy compound represented by one of the formulas I to X: ##STR4## or a mono-, di-, tri- or tetra-halogeno-nuclear substituted derivative of an aromatic dihydroxy compound represented by one of the formulas I to X, through the phosgene method or the ester interchange method, with a cyanogen halide in the presence of a base in an inert solvent.
Claim 2
Dependent Claim
84 words
A cyanic acid ester of an aromatic polycarbonate obtained by reacting an aromatic polycarbonate having one or two terminal hydroxyl groups and prepared from an aromatic dihydroxy compound represented by one of the formulas I to X: ##STR4## or a mono-, di-, tri- or tetra-halogeno-nuclear substituted derivative of an aromatic dihydroxy compound represented by one of the formulas I to X, through the phosgene method or the ester interchange method, with a cyanogen halide in the presence of a base in an inert solvent.
Claim 3
Dependent Claim
17 words
A cyanic acid ester according to claim 1, wherein the aromatic polycarbonate has two terminal hydroxyl groups.
Claim 4
Dependent Claim
22 words
A cyanic acid ester according to claim 1, wherein the aromatic polycarbonate has a number average molecular weight of less than 4,000.
Claim 5
Dependent Claim
22 words
A cyanic acid ester according to claim 1, wherein the aromatic polycarbonate has a number average molecular weight of 500 to 2,000.
Claim 6
Dependent Claim
30 words
A cyanic acid ester according to claim 1, wherein the aromatic dihydroxy compound is one represented by the formula ##STR5## or a mono-, di-, tri- or tetra-halogeno-nuclear substituted derivative thereof.
Claim 7
Dependent Claim
15 words
A cyanic acid ester according to claim 1, wherein the aromatic dihydroxy compound is 2,2-bis(4-hydroxyphenyl)propane.
Claim 8
Dependent Claim
15 words
A cyanic acid ester according to claim 1, wherein the aromatic dihydroxy compound is 2,2-bis(3,5-dibromo-4-hydroxylphenyl)propane.
Claim 9
Dependent Claim
31 words
A cyanic acid ester according to claim 6, wherein the aromatic polycarbonate has a number average molecular weight of 659 and 1.8 terminal hydroxyl groups and is reacted with cyanogen bromide.
Claim 10
Dependent Claim
31 words
A cyanic acid ester according to claim 7, wherein the aromatic polycarbonate has a number average molecular weight of 1,480 and 1.8 terminal hydroxyl groups and is reacted with cyanogen chloride.
Claim 11
Dependent Claim
31 words
A cyanic acid ester according to claim 6, wherein the aromatic polycarbonate has a number average molecular weight of 1,550 and 1.7 terminal hydroxyl groups and is reacted with cyanogen bromide.
Claim 12
Dependent Claim
31 words
A cyanic acid ester according to claim 6, wherein the aromatic polycarbonate has a number average molecular weight of 2,100 and 1.6 terminal hydroxyl groups and is reacted with cyanogen bromide.
Claim 13
Dependent Claim
31 words
A cyanic acid ester according to claim 6, wherein the aromatic polycarbonate has a number average molecular weight of 3,500 and 1.5 terminal hydroxyl groups and is reacted with cyanogen bromide.
Claim 14
Dependent Claim
33 words
A cyanic acid ester according to claim 1, wherein the cyanogen halide is used in a proportion of at least one equivalent per equivalent of the terminal hydroxyl group of the aromatic polycarbonate.
Claim 15
Dependent Claim
17 words
A cyanic acid ester according to claim 1, wherein the cyanogen halide is cyanogen chloride or bromide.
Claim 16
Dependent Claim
21 words
A cyanic acid ester according to claim 1, wherein the reaction is effected at a temperature of -30° to 65° C.
Claim 17
Dependent Claim
35 words
A cyanic acid ester according to claim 1, wherein the base is an alkali metal hydroxide, an alkaline earth metal hydroxide, an alkali metal bicarbonate, an alkali metal carbonate, an alcoholate or a tertiary amine.
Claim 18
Dependent Claim
32 words
A cyanic acid ester according to claim 1, wherein the base is used in a proportion of at least 0.7 equivalent per equivalent of the terminal hydroxyl group of the aromatic polycarbonate.
Claim 19
Dependent Claim
26 words
A cyanic acid ester according to claim 1, wherein the inert solvent is a hydrocarbon, a halogenated hydrocarbon, a nitrated hydrocarbon, a ketone or an ether.
Claim 20
Dependent Claim
23 words
A cyanic acid ester according to claim 1, wherein the equivalent ratio of the base to the cyanogen halide is less than 1.
References Cited (Backward Citations)
US5162664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |