Patent US4332921A successfully refreshed from Google Patents.
US4332921A
Expired / Lapsed
US
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Polycarbonate/polyphosphonate thermoplastic composition
Assignee: Bayer AG
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Filing: 1980-12-29
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Granted: 1982-06-01
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Expires: 2000-12-29
Abstract
Abstract The invention is directed to compositions comprising halogen-free aromatic polycarbonates and halogen-free aromatic polyphosphonates suitable for producing films of improved flame resistance and to processes for their preparation.
Inventors
- 👤 Manfred Schmidt
- 👤 Joachim Wank
- 👤 Eckart Reese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:03
CPC Classifications
C; C08; C08L; C08L69/00; C08L85/00; C08L85/02; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
44 words
A composition comprising (a) 40 to 85% by weight of a halogen-free aromatic polycarbonate having a weight-average molecular weight greater than 24,000, and (b) 60 to 15% by weight of a halogen-free aromatic polyphosphonate having a number-average molecular weight of about 11,000 to 200,000.
Claim 2
Dependent Claim
44 words
A composition comprising (a) 40 to 85% by weight of a halogen-free aromatic polycarbonate having a weight-average molecular weight greater than 24,000, and (b) 60 to 15% by weight of a halogen-free aromatic polyphosphonate having a number-average molecular weight of about 11,000 to 200,000.
Claim 3
Dependent Claim
20 words
The composition of claim 1, wherein said halogen-free aromatic polycarbonate is one having a weight-average of about 35,000 to 120,000.
Claim 4
Dependent Claim
27 words
The composition of claim 1, wherein said (a) is from about 60 to 85% by weight and said (b) is from about 40 to 15% by weight.
Claim 5
Dependent Claim
47 words
Films prepared of a composition comprising (a) 40 to 85% by weight of a halogen-free aromatic polycarbonate having a weight-average molecular weight greater than 24,000, and (b) 60 to 15% by weight of a halogen-free aromatic polyphosphonate having a number-average molecular weight of about 11,000 to 200,000.
Claim 6
Dependent Claim
47 words
Films prepared of a composition comprising (a) 40 to 85% by weight of a halogen-free aromatic polycarbonate having a weight-average molecular weight greater than 24,000, and (b) 60 to 15% by weight of a halogen-free aromatic polyphosphonate having a number-average molecular weight of about 11,000 to 200,000.
Claim 7
Dependent Claim
8 words
The films of claim 4 prepared by extrusion.
Claim 8
Dependent Claim
8 words
The films of claim 4 prepared by casting.
Claim 9
Dependent Claim
68 words
A process for preparing polycarbonate/polyphosphonate compositions comprising melting a composition comprising 40 to 85% by weight of a halogen-free aromatic polycarbonate having a weight-average molecular weight greater than 24,000 and 60 to 15% by weight of a halogen-free aromatic polyphosphonate having a number-average molecular weight of about 11,000 to about 200,000 with simultaneous or subsequent intimate mixing and subsequent extrusion of the homogenized melt in a suitable apparatus.
Claim 10
Dependent Claim
68 words
A process for preparing polycarbonate/polyphosphonate compositions comprising melting a composition comprising 40 to 85% by weight of a halogen-free aromatic polycarbonate having a weight-average molecular weight greater than 24,000 and 60 to 15% by weight of a halogen-free aromatic polyphosphonate having a number-average molecular weight of about 11,000 to about 200,000 with simultaneous or subsequent intimate mixing and subsequent extrusion of the homogenized melt in a suitable apparatus.
Claim 11
Dependent Claim
74 words
A process for preparing polycarbonate/polyphosphonate compositions comprising melting a halogen-free aromatic polycarbonate having a weight-average molecular weight greater than 24,000 and metering into the resulting melt a halogen-free aromatic polyphosphonate having a number-average molecular weight of about 11,000 to about 200,000, homogenizing the melt and then extruding the mixture in a suitable apparatus, said composition comprising 40 to 85% by weight of said aromatic polycarbonate and 60 to 15% by weight of said polyphosphonate.
Claim 12
Dependent Claim
74 words
A process for preparing polycarbonate/polyphosphonate compositions comprising melting a halogen-free aromatic polycarbonate having a weight-average molecular weight greater than 24,000 and metering into the resulting melt a halogen-free aromatic polyphosphonate having a number-average molecular weight of about 11,000 to about 200,000, homogenizing the melt and then extruding the mixture in a suitable apparatus, said composition comprising 40 to 85% by weight of said aromatic polycarbonate and 60 to 15% by weight of said polyphosphonate.
Claim 13
Dependent Claim
77 words
A process for preparing polycarbonate/polyphosphonate compositions comprising mixing solutions of said polycarbonates and of said polyphosphonates and evaporating off the solvents while melting the mixture and at the same time extruding the melt, said composition comprising (a) 40 to 85% by weight of a halogen-free aromatic polycarbonate having a weight-average molecular weight greater than 24,000, and (b) 60 to 15% by weight of a halogen-free aromatic polyphosphonate having a number-average molecular weight of about 11,000 to 200,000.
Claim 14
Dependent Claim
77 words
A process for preparing polycarbonate/polyphosphonate compositions comprising mixing solutions of said polycarbonates and of said polyphosphonates and evaporating off the solvents while melting the mixture and at the same time extruding the melt, said composition comprising (a) 40 to 85% by weight of a halogen-free aromatic polycarbonate having a weight-average molecular weight greater than 24,000, and (b) 60 to 15% by weight of a halogen-free aromatic polyphosphonate having a number-average molecular weight of about 11,000 to 200,000.
Claim 15
Dependent Claim
80 words
A process for preparing polycarbonate/polyphosphonate compositions comprising admixing a solution of a polycarbonate to a melt of polyphosphonate, evaporating off the solvent while melting said polycarbonate, homogenizing the melt and then extruding in a suitable apparatus, said composition comprising (a) 40 to 85% by weight of a halogen-free aromatic polycarbonate having a weight-average molecular weight greater than 24,000, and (b) 60 to 15% by weight of a halogen-free aromatic polyphosphonate having a number-average molecular weight of about 11,000 to 200,000.
Claim 16
Dependent Claim
80 words
A process for preparing polycarbonate/polyphosphonate compositions comprising admixing a solution of a polycarbonate to a melt of polyphosphonate, evaporating off the solvent while melting said polycarbonate, homogenizing the melt and then extruding in a suitable apparatus, said composition comprising (a) 40 to 85% by weight of a halogen-free aromatic polycarbonate having a weight-average molecular weight greater than 24,000, and (b) 60 to 15% by weight of a halogen-free aromatic polyphosphonate having a number-average molecular weight of about 11,000 to 200,000.
Claim 17
Dependent Claim
44 words
A composition comprising (a) 40 to 85% by weight of a halogen-free aromatic polycarbonate having a weight-average molecular weight greater than 24,000, and (b) 60 to 15% by weight of a halogen-free aromatic polyphosphonate having a number-average molecular weight of about 13,000 to 80,000.
Claim 18
Dependent Claim
44 words
A composition comprising (a) 40 to 85% by weight of a halogen-free aromatic polycarbonate having a weight-average molecular weight greater than 24,000, and (b) 60 to 15% by weight of a halogen-free aromatic polyphosphonate having a number-average molecular weight of about 13,000 to 80,000.
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) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |