US4024102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding composition suitable for forming improved flame retardant three-dimensional shaped articles
Assignee: Celanese Corp
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Filing: 1974-02-13
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Granted: 1977-05-17
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Expires: 1994-02-13
Abstract
Abstract An improved flame retardant molding composition of polypropylene terephthalate or polybutylene terephthalate is provided. The composition includes in intimate admixture with the non-halogenated polypropylene terephthalate or polybutylene terephthalate an oxide of antimony, a reinforcing agent (e.g. a glass fiber reinforcing agent), and a polyalkylene-2,5-dibromoterephthalate. Unlike the flame retardant molding compositions of the prior art, the components of the same tend to be non-exuding during utilization of the 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
2026-11-08 04:42
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/2279; C08K3/01; C08K3/013; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
164 words
A molding composition having flame retardant properties when molded into three-dimensional articles comprising a physical admixture of a. about 30 to 80 percent by weight of a non-halogenated polyalkylene terephthalate selected from the group consisting of polypropylene terephthalate and polybutylene terephthalate having an inherent viscosity of about 0.2 to about 1.4 deciliters per gram, b. about 2 to 7 percent by weight of an oxide of antimony, c. about 2 to 60 percent by weight of a reinforcing agent, and d. as an organic flame retardant additive about 5 to 20 percent by weight of a polyalkylene-2,5-dibromoterephthalate consisting of recurring units of the formula ##STR4## where n= 2, 3 or 4, and x= about 3 to 25, with said polyalkylene-2,5-dibromoterephthalate exhibiting no propensity to exude from said physical admixture during utilization of a three-dimensional article molded therefrom at an elevated temperature of 175° C. for 66 hours and with said composition when molded being self-extinguishing and non-dripping when subjected to the UL-94 Flammability Test.
Claim 2
Dependent Claim
164 words
A molding composition having flame retardant properties when molded into three-dimensional articles comprising a physical admixture of a. about 30 to 80 percent by weight of a non-halogenated polyalkylene terephthalate selected from the group consisting of polypropylene terephthalate and polybutylene terephthalate having an inherent viscosity of about 0.2 to about 1.4 deciliters per gram, b. about 2 to 7 percent by weight of an oxide of antimony, c. about 2 to 60 percent by weight of a reinforcing agent, and d. as an organic flame retardant additive about 5 to 20 percent by weight of a polyalkylene-2,5-dibromoterephthalate consisting of recurring units of the formula ##STR4## where n= 2, 3 or 4, and x= about 3 to 25, with said polyalkylene-2,5-dibromoterephthalate exhibiting no propensity to exude from said physical admixture during utilization of a three-dimensional article molded therefrom at an elevated temperature of 175° C. for 66 hours and with said composition when molded being self-extinguishing and non-dripping when subjected to the UL-94 Flammability Test.
Claim 3
Dependent Claim
16 words
An improved molding composition according to claim 1 wherein said non-halogenated polyalkylene terephthalate is polybutylene terephthalate.
Claim 4
Dependent Claim
16 words
An improved molding composition according to claim 1 wherein said non-halogenated polyalkylene terephthalate is polypropylene terephthalate.
Claim 5
Dependent Claim
25 words
An improved molding composition according to claim 1 wherein said non-halogenated polyalkylene terephthalate has an inherent viscosity of about 0.4 to 1.2 deciliters per gram.
Claim 6
Dependent Claim
22 words
An improved molding composition according to claim 1 wherein in said formula for the recurring units of said polyalkylene-2,5-dibromoterephthalate n = 2.
Claim 7
Dependent Claim
32 words
An improved molding composition according to claim 1 wherein said composition includes about 20 to 40 percent by weight of glass fiber reinforcing agent based upon the total weight of said composition.
Claim 8
Dependent Claim
21 words
An improved molding composition according to claim 1 wherein x in the formula of said polyalkylene-2,5-dibromoterephthalate is about 5 to 15.
Claim 9
Dependent Claim
132 words
A molding composition capable of forming improved flame retardant three-dimensional shaped articles comprising a physical admixture 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 polyalkylene-2,5-dibromoterephthalate consisting of recurring units of the formula ##STR5## where x = about 3 to 25, c. about 3 to 6 percent by weight of an oxide of antimony, and d. about 20 to 40 percent by weight of glass fiber reinforcing agent, with said composition when molded (1) being self-extinguishing and non-dripping when subjected to the UL-94 Flammability Test, and (2) showing no propensity for any component thereof to exude from the same during utilization at an elevated temperature of 175° C. for 66 hours.
Claim 10
Dependent Claim
132 words
A molding composition capable of forming improved flame retardant three-dimensional shaped articles comprising a physical admixture 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 polyalkylene-2,5-dibromoterephthalate consisting of recurring units of the formula ##STR5## where x = about 3 to 25, c. about 3 to 6 percent by weight of an oxide of antimony, and d. about 20 to 40 percent by weight of glass fiber reinforcing agent, with said composition when molded (1) being self-extinguishing and non-dripping when subjected to the UL-94 Flammability Test, and (2) showing no propensity for any component thereof to exude from the same during utilization at an elevated temperature of 175° C. for 66 hours.
Claim 11
Dependent Claim
21 words
An improved molding composition according to claim 8 wherein x in the formula of said polyalkylene-2,5-dibromoterephthalate is about 5 to 15.
Claim 12
Dependent Claim
13 words
An improved molding composition according to claim 8 which is free of asbestos.
Claim 13
Dependent Claim
49 words
An improved three-dimensional shaped article molded from the composition of claim 8 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 at an elevated temperature of 175° C. for 66 hours.
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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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |