US4308373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Halogen-containing polycarbonate resin and process for producing same
Assignee: Mitsubishi Chemical Corp
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Filing: 1980-09-26
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Granted: 1981-12-29
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Expires: 2000-09-26
Abstract
Abstract A halogen-containing polycarbonate resin is formed by co-polymerizing: (a) 15 to 55 parts by weight of a polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 500 to 10,000 and containing no aromatic halogen or less than 4% by weight of aromatic halogen, (b) 20 to 80 parts by weight of a halogen-containing polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 1,000 to 10,000 and containing 6 to 30% by weight aromatic halogen, and (c) 5 to 25 parts by weight of bisphenol A.
Inventors
- 👤 Hazime Mori
- 👤 Katsuhisa Kohyama
- 👤 Katsuhiko Nakamura
- 👤 Shigeyuki Haruhata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:04
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/18; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
121 words
A halogen-containing polycarbonate resin formed by copolyerizing in the presence of an organic solvent: (a) 15 to 55 parts by weight of a polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 500 to 10,000, containing no aromatic halogen or less than 4% by weight of aromatic halogen and containing recurring units derived from bisphenol A and phosgene, (b) 20 to 80 parts by weight of a halogen-containing polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 1,000 to 10,000, containing 6 to 30% by weight of aromatic halogen and containing recurring units derived from bisphenol A, halogenated bisphenol A and phosgene, and (c) 5 to 25 parts by weight of bisphenol A.
Claim 2
Dependent Claim
121 words
A halogen-containing polycarbonate resin formed by copolyerizing in the presence of an organic solvent: (a) 15 to 55 parts by weight of a polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 500 to 10,000, containing no aromatic halogen or less than 4% by weight of aromatic halogen and containing recurring units derived from bisphenol A and phosgene, (b) 20 to 80 parts by weight of a halogen-containing polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 1,000 to 10,000, containing 6 to 30% by weight of aromatic halogen and containing recurring units derived from bisphenol A, halogenated bisphenol A and phosgene, and (c) 5 to 25 parts by weight of bisphenol A.
Claim 3
Dependent Claim
15 words
A polycarbonate resin in accordance with claim 1 containing 6 to 24% by weight halogen.
Claim 4
Dependent Claim
157 words
A process for forming a halogen-containing polycarbonate resin comprising: (a) copolymerizing in the presence of an organic solvent to form a solution of the halogen-containing polycarbonate in the organic solvent: (1) 15 to 55 parts by weight of a polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 500 to 10,000, containing no aromatic halogen or less than 4% by weight of aromatic halogen and containing recurring units derived from bisphenol A and phosgene, (2) 20 to 80 parts by weight of a halogen containing polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 1,000 to 10,000, containing 6 to 30% by weight of aromatic halogen and containing recurring units derived from bisphenol A, halogenated bisphenol A and phosgene, and (3) 5 to 25 parts by weight of bisphenol A; (b) washing said solution with an aqueous washing agent; and (c) recovering the polycarbonate resin from the organic solvent.
Claim 5
Dependent Claim
157 words
A process for forming a halogen-containing polycarbonate resin comprising: (a) copolymerizing in the presence of an organic solvent to form a solution of the halogen-containing polycarbonate in the organic solvent: (1) 15 to 55 parts by weight of a polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 500 to 10,000, containing no aromatic halogen or less than 4% by weight of aromatic halogen and containing recurring units derived from bisphenol A and phosgene, (2) 20 to 80 parts by weight of a halogen containing polycarbonate oligomer with terminal chloroformate groups, having a number average molecular weight of 1,000 to 10,000, containing 6 to 30% by weight of aromatic halogen and containing recurring units derived from bisphenol A, halogenated bisphenol A and phosgene, and (3) 5 to 25 parts by weight of bisphenol A; (b) washing said solution with an aqueous washing agent; and (c) recovering the polycarbonate resin from the organic solvent.
Claim 6
Dependent Claim
12 words
The process of claim 3 wherein said organic solvent is methylene chloride.
Claim 7
Dependent Claim
32 words
A process in accordance with claim 4 wherein the viscosity of a methylene chloride solution containing 0.6 g/dl of the halogen-containing polycarbonate resin is 0.3 to 1.0 as measured at 20° C.
Claim 8
Dependent Claim
36 words
The process of claim 3 wherein the halogen-containing polycarbonate resin is recovered from the organic solvent by evaporating the organic solvent to concentrate the solution and thereby cause the halogen-containing polycarbonate resin to separate from solution.
Claim 9
Dependent Claim
17 words
The process of claim 6 wherein the halogen-containing resin is simultaneously comminuted as it separates from solution.
Claim 10
Dependent Claim
51 words
The product of claim 1 wherein oligomer (b) is formed by (1) reacting phosgene with a mixture of bisphenol A and a halogenated bisphenol A or (2) reacting phosgene with bisphenol A alone to form an oligomer reaction product and then reacting said oligomer reaction product with a halogenated bisphenol A.
Claim 11
Dependent Claim
57 words
The process of claim 3 wherein said oligomer containing 6-30% by weight of aromatic halogen is formed by (1) reacting phosgene with a mixture of bisphenol A and a halogenated bisphenol or (2) reacting phosgene with bisphenol A alone to form an oligomer reaction product and then reacting said oligomer reaction product with a halogenated bisphenol A.
Claim 12
Dependent Claim
21 words
The product of claim 1 or 8 wherein oligomer (b) is formed by reacting oligomer (a) with a halogenated bisphenol A.
Claim 13
Dependent Claim
43 words
The process of claim 3 or 9 wherein said oligomer containing 6 to 30% by weight of aromatic halogen is formed by reacting an oligomer containing no aromatic halogen or less than 4% by weight of aromatic halogen with a halogenated bisphenol A.
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) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |