Patent US3883471A successfully refreshed from Google Patents.
US3883471A
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Composition for use in the formation of three-dimensional flame retardant articles
Assignee: Celanese Corp
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Filing: 1974-01-10
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Granted: 1975-05-13
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Expires: 1994-01-10
Abstract
Abstract An improved flame retardant molding composition of polypropylene terephthalate or polybutylene terephthalate is provided. The composition includes in intimate admixture an oxide of antimony and a specific brominated aromatic polyphosphate copolymer which has been found to be highly compatible with the other components. In a preferred embodiment the molding composition additionally includes a reinforcing agent (e.g. a glass fiber reinforcing agent). Unlike the flame ratardant molding compositions of the prior art, the components of the same tend to be non-exuding during utilization of a resulting three-dimensional shaped article at elevated temperatures (e.g. after 66 hours at 175*C.) and thereby render the same suitable for attractive utilization in an even wider range of applications.
Inventors
- 👤 Robert W Stackman
- 👤 Frank M Berardinelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:19
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/2279; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/521; C08K5/523; C08L; C08L67/00; C08L67/02; C08L85/00; C08L85/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
60 words
A MOLDING COMPOSITION HAVING FLAME RETARDANT PROPERTIES WHEN MOLDED INTO THREE-DIMENSIONAL ARTICLES COMPRISING AN INTIMATE BLEND OF A. A POLYALKYLENE TEREPHTHALATE SELECTED FROM THE GROUP CONSISTING OF POLYPROPYLENE TEREPHTHALATE AND POLYBUTYL ENE TEREPHTHALATE HAVING AN INHERENT VISCOSITY OF ABOUT 0.2 TO 1.4 DECILITERS PER GRAM, B. AN OXIDE OF ANTIMONY, AND C. A BROMINATED AROMATIC POLYPHOSPHATE COPOLYMER OF THE FORMULA
Claim 2
Dependent Claim
60 words
A MOLDING COMPOSITION HAVING FLAME RETARDANT PROPERTIES WHEN MOLDED INTO THREE-DIMENSIONAL ARTICLES COMPRISING AN INTIMATE BLEND OF A. A POLYALKYLENE TEREPHTHALATE SELECTED FROM THE GROUP CONSISTING OF POLYPROPYLENE TEREPHTHALATE AND POLYBUTYL ENE TEREPHTHALATE HAVING AN INHERENT VISCOSITY OF ABOUT 0.2 TO 1.4 DECILITERS PER GRAM, B. AN OXIDE OF ANTIMONY, AND C. A BROMINATED AROMATIC POLYPHOSPHATE COPOLYMER OF THE FORMULA
Claim 3
Dependent Claim
15 words
An improved molding composition according to claim 1 wherein said polyalkylene terephthalate is polybutylene terephthalate.
Claim 4
Dependent Claim
15 words
An improved molding composition according to claim 1 wherein said polyalkylene terephthalate is polypropylene terepthalate.
Claim 5
Dependent Claim
24 words
An improved molding composition according to claim 1 wherein said polyalkylene terephthalate has an inherent viscosity of about 0.4 to 1.2 deciliters per gram.
Claim 6
Dependent Claim
38 words
An improved molding composition according to claim 1 wherein said brominated aromatic polyphosphate copolymer is provided in said molding composition in concentration of about 15 to 30 percent by weight based upon the weight of said polyalkylene terephthalate.
Claim 7
Dependent Claim
38 words
An improved molding composition according to claim 1 wherein said oxide of antimony is provided in said molding composition in a concentration of about 4 to 8 percent by weight based upon the weight of said polyalkylene terephthalate.
Claim 8
Dependent Claim
30 words
An improved molding composition according to claim 1 wherein said composition additionally includes about 20 to 40 percent by weight reinforcing agent based upon the total weight of said composition.
Claim 9
Dependent Claim
33 words
An improved molding composition according to claim 1 wherein said composition additionally includes about 20 to 40 percent by weight of glass fiber reinforcing agent based upon the total weight of said composition.
Claim 10
Dependent Claim
30 words
An improved molding composition according to claim 1 wherein in the formula of said brominated aromatic polyphosphate copolymer x about 1, y about 1, and n about 5 to 15.
Claim 11
Dependent Claim
54 words
A molding composition capable of forming improved flame retardant three-dimensional shaped articles comprising an intimate blend of a. 40 to 70 percent by weight polybutylene terephthalate having an inherent viscosity of about 0.4 to 1.2 deciliters per gram, b. 10 to 15 percent by weight of a polymeric brominated aromatic phosphate of the formula
Claim 12
Dependent Claim
54 words
A molding composition capable of forming improved flame retardant three-dimensional shaped articles comprising an intimate blend of a. 40 to 70 percent by weight polybutylene terephthalate having an inherent viscosity of about 0.4 to 1.2 deciliters per gram, b. 10 to 15 percent by weight of a polymeric brominated aromatic phosphate of the formula
Claim 13
Dependent Claim
30 words
An improved molding composition according to claim 10 wherein in the formula of said polymeric brominated aromatic phosphate x about 1, y about 1, and n about 5 to 15.
Claim 14
Dependent Claim
13 words
An improved molding composition according to claim 10 which is free of asbestos.
Claim 15
Dependent Claim
50 words
An improved three-dimensional shaped article molded from the composition of claim 10 which (1) is self-extinguishing and non-dripping when subjected to the UL-94 Flammability Test, and (2) shows no propensity for any component thereof to exude from the same during utilization at an elevated temperature of 175*C. for 66 hours.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |