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US4786707A
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Branched polycarbonate derived from single-ring aromatic compound
Assignee: Enichem Technoresine SpA
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Filing: 1986-12-17
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Granted: 1988-11-22
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Expires: 2006-12-17
Abstract
Abstract In the present invention disclosed are high-molecular-weight, soluble, thermoplastic branched polycarbonates endowed with improved properties, and suitable to blow-moulding fabrication. Such polycarbonates are characterized by the presence, in their structure, of units deriving from the following single-ring aromatic compounds: ##STR1## wherein R 1 indicates H, --COCl, --SO 2 Cl; R 2 , and R 3 , equal to or different from each other, indicate --COCl or SO 2 Cl. The above-said compounds are directly used in the syntheses.
Inventors
- 👤 Piero Manaresi
- 👤 Francesco Pilati
- 👤 Corrado Berti
- 👤 Alberto Petri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:21
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/081; C08G64/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
57 words
Branched aromatic polycarbonate comprised of units derived from the copolymerization of at least one aromatic dihydroxy compound, a carbonate precursor, and at least one single-ring aromatic compound, having the following formula (I): ##STR4## wherein R 1 represents H, --COCl, or --SO 2 Cl, and R 2 and R 3 , represent, independently, --COCl or --SO 2 Cl.
Claim 2
Dependent Claim
57 words
Branched aromatic polycarbonate comprised of units derived from the copolymerization of at least one aromatic dihydroxy compound, a carbonate precursor, and at least one single-ring aromatic compound, having the following formula (I): ##STR4## wherein R 1 represents H, --COCl, or --SO 2 Cl, and R 2 and R 3 , represent, independently, --COCl or --SO 2 Cl.
Claim 3
Dependent Claim
39 words
Branched polycarbonate according to claim 1, characterized in that the units derived from the compound having fiormula (I) are present in an amount ranging from 0.05 to 5 mol % relative to the units of the aromatic dihydroxy compound.
Claim 4
Dependent Claim
85 words
Branched polycarbonate according to claim 1, characterized in that the compound having formula (I) is selected among; 5-sulpho-isophthalic acid trichloride, wherein R 1 is H, and R 2 and R 3 are --COCl; 3,5-disulphobenzoic acid trichloride, wherein R 1 is H, R 2 is --COCl, and R 3 is --SO 2 Cl; 1,3,5-benzenetrisulphonic acid trichloride, wherein R 1 is H, R 2 is --COCl, and R 3 is --SO 2 Cl; 6-sulphotrimellitic acid trichloride, wherein R 1 , R 2 and R 3 are --COCl.
References Cited (Backward Citations)
US3262914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |