US4320049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retarding agents for polycarbonates
Assignee: Bayer Corp
•
Filing: 1980-07-14
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Granted: 1982-03-16
•
Expires: 2000-07-14
Abstract
Abstract A sufficient amount of a novel halogenated aromatic imide sulfonate, represented by the structural formula: <IMAGE> wherein X is a halogen, n is 1 to 4, Y is a lower alkyl having 1 to 4 carbon atoms, a halogen or a hydrogen atom, "a" is 0 to 4, M is an alkali metal and T is either 0 or 1, is incorporated into an aromatic polycarbonate to provide flame resistance thereto.
Inventors
- 👤 Sivaram Krishnan
- 👤 Russell P. Carter, Jr.
- 👤 Robert D. Kroshefsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:09
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48; C08; C08K; C08K5/00; C08K5/36; C08K5/41; C08K5/42
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
53 words
The compound ##STR7## wherein X is a halogen, n is an integer from 1 to 4, Y is a lower alkyl having 1 to 4 carbon atoms, a halogen or a hydrogen atom, a is an integer from 0 to 4, M is an alkali metal, and T is either 0 or 1.
Claim 2
Dependent Claim
53 words
The compound ##STR7## wherein X is a halogen, n is an integer from 1 to 4, Y is a lower alkyl having 1 to 4 carbon atoms, a halogen or a hydrogen atom, a is an integer from 0 to 4, M is an alkali metal, and T is either 0 or 1.
Claim 3
Dependent Claim
3 words
The compound ##STR8##
Claim 4
Dependent Claim
3 words
The compound ##STR8##
Claim 5
Dependent Claim
28 words
In the process of rendering thermoplastic aromatic polycarbonates flame resistant, the improvement comprising blending therewith 0.01 to 1% by weight the compound of claim 1 or claim 2.
Claim 6
Dependent Claim
28 words
In the process of rendering thermoplastic aromatic polycarbonates flame resistant, the improvement comprising blending therewith 0.1 to 0.75% by weight the compound of claim 1 or claim 2.
Claim 7
Dependent Claim
23 words
A thermoplastic aromatic polycarbonate comprising a polycarbonate resin and, from 0.01 to 1% by weight, the compound of claim 1 or claim 2.
Claim 8
Dependent Claim
23 words
A thermoplastic aromatic polycarbonate comprising a polycarbonate resin and, from 0.1 to 0.75% by weight, the compound of claim 1 or claim 2.
Claim 9
Dependent Claim
18 words
The thermoplastic aromatic polycarbonate of claim 5 or claim 6, wherein said polycarbonate resin is derived from bis-2-(4-hydroxyphenyl)propane.
Claim 10
Dependent Claim
75 words
A thermally stable flame retarding agent for polycarbonates, of the general formula: ##STR9## wherein X is a halogen atom, n equals 1 to 4, Y is a lower alkyl having 1 to 4 carbon atoms or a halogen atom, "a" is 0 to 4, M is an alkali metal and T is either 0 or 1 characterized in that it retains at least 90% of its weight after exposure to 300° C. for 30 minutes.
Claim 11
Dependent Claim
75 words
A thermally stable flame retarding agent for polycarbonates, of the general formula: ##STR9## wherein X is a halogen atom, n equals 1 to 4, Y is a lower alkyl having 1 to 4 carbon atoms or a halogen atom, "a" is 0 to 4, M is an alkali metal and T is either 0 or 1 characterized in that it retains at least 90% of its weight after exposure to 300° C. for 30 minutes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |