US4632953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-extinguishing polycarbonate composition
Assignee: ENICHEM TECNORESINE SpA PALERMO ITALY AN ITALIAN Co
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Filing: 1986-03-03
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Granted: 1986-12-30
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Expires: 2006-03-03
Abstract
Abstract Composition of self-extinguishing polycarbonate comprising, in mixture, a not halogenated aromatic polycarbonate and a mixture of additives conferring self-extinguishing characteristics to the same polycarbonate, formed by: (a) salt of alkaline metal, of alkaline-earth metal or of zinc, or mixed salt of said metals, of ethylenediaminotetraacetic acid; (b) oligomer of polycarbonate from tetrabromobisphenol-A terminated with phenol, or decabromodiphenyloxide; and (c) polytetrafluoroethylene.
Inventors
- 👤 Giovanni Dozzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:26
CPC Classifications
C; C08; C08L; C08L69/00; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/175
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
Composition of self-extinguishing polycarbonate comprising, in mixture, a non halogenated aromatic polycarbonate, and a mixture of additives conferring self-extinguishment characteristics to said polycarbonate, formed by: (a) a salt of alkaline metal, of alkaline-earth metal or of zinc, or mixed salt of these metals, of ethylene-diaminotetraacetic acid; (b) a phenol-terminated oligomer of polycarbonate from tetrabromobisphenol-A, or decabromo-diphenyl oxide; and (c) polytetrafluoroethylene; wherein additives (a), (b) and (c) are present in amounts of from 0.2 to 1.5 parts by weight per each 100 parts by weight of polycarbonate, the weight ratio of additive (b) to additive (a) varying within the range of from 1/1 to 16/1, and the weight ratio of additive (c) to additive (a) varying within the range of from 0.5/1 to 6/1.
Claim 2
Dependent Claim
123 words
Composition of self-extinguishing polycarbonate comprising, in mixture, a non halogenated aromatic polycarbonate, and a mixture of additives conferring self-extinguishment characteristics to said polycarbonate, formed by: (a) a salt of alkaline metal, of alkaline-earth metal or of zinc, or mixed salt of these metals, of ethylene-diaminotetraacetic acid; (b) a phenol-terminated oligomer of polycarbonate from tetrabromobisphenol-A, or decabromo-diphenyl oxide; and (c) polytetrafluoroethylene; wherein additives (a), (b) and (c) are present in amounts of from 0.2 to 1.5 parts by weight per each 100 parts by weight of polycarbonate, the weight ratio of additive (b) to additive (a) varying within the range of from 1/1 to 16/1, and the weight ratio of additive (c) to additive (a) varying within the range of from 0.5/1 to 6/1.
Claim 3
Dependent Claim
18 words
Composition according to claim 1, characterized in that non halogenated aromatic polycarbonate is a polycarbonate of bisphenol A.
Claim 4
Dependent Claim
31 words
Composition according to claim 1, characterized in that additive (a) is a mixed salt of calcium and sodium, or of barium and sodium, or of zinc and potassium of ethylenediaminotetraacetic acid.
Claim 5
Dependent Claim
71 words
Composition according to claim 1, characterized in that it contains additives (a), (b) and (c) in an amount ranging from 0.4 to 1.2 parts by weight per each 100 parts by weight of polycarbonate, the weight ratio of additive (b) to additive (a) varying within the range of from 2/1 to 10/1, and the weight ratio of additive (c) to additive (a) varying within the range of from 1/1 to 4/1.
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) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |