Patent US3987008A successfully refreshed from Google Patents.
US3987008A
Expired / Lapsed
US
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Flame retardant polyester
Assignee: Celanese Corp
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Filing: 1973-02-15
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Granted: 1976-10-19
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Expires: 1993-02-15
Abstract
Abstract Flame retardant polyester compositions are provided which comprise melt blends of a synthetic linear polyester with up to about 25 percent, based on the weight of polyester, of a polyphosphate having the following formula: ##EQU1## WHEREIN Ar is a divalent radical having up to about 20 carbon atoms selected from arylene and haloarylene; R is a monovalent radical having up to about 20 carbon atoms selected from alkyl, aryl, haloalkyl and haloaryl; n is an integer greater than 1; and X is a monovalent radical selected from the group consisting of H, alkyl, aryl, haloalkyl and haloaryl, Y is a monovalent radical selected from the group consisting of H, OH and ##EQU2## where X and R are as above.
Inventors
- 👤 Robert William Stackman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:56
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; Y; Y10; Y10S; Y10S57/00; Y10S57/904
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
126 words
Fiber comprising phosphorus-containing polyester compositions having improved flame retardant properties wherein said compositions comprise melt blends of a synthetic linear polyester selected from the group consisting of poly(ethylene terephthalate) and poly(tetramethylene terephthalate) with up to about 25 weight percent of a polyphosphate having the following general formula: ##EQU3## wherein Ar is an arylene group having up to about 20 carbon atoms; R is a monovalent radical having up to about 20 carbon atoms selected from the group consisting of alkyl and aryl; n is an integer greater than 1; and X is a monovalent radical selected from the group consisting of alkyl and aryl; Y is a monovalent radical selected from the group consisting of H, OH and ##EQU4## where X and R are as above.
Claim 2
Dependent Claim
126 words
Fiber comprising phosphorus-containing polyester compositions having improved flame retardant properties wherein said compositions comprise melt blends of a synthetic linear polyester selected from the group consisting of poly(ethylene terephthalate) and poly(tetramethylene terephthalate) with up to about 25 weight percent of a polyphosphate having the following general formula: ##EQU3## wherein Ar is an arylene group having up to about 20 carbon atoms; R is a monovalent radical having up to about 20 carbon atoms selected from the group consisting of alkyl and aryl; n is an integer greater than 1; and X is a monovalent radical selected from the group consisting of alkyl and aryl; Y is a monovalent radical selected from the group consisting of H, OH and ##EQU4## where X and R are as above.
Claim 3
Dependent Claim
12 words
The polyester compositions of claim 1 wherein R is an aryl group.
Claim 4
Dependent Claim
21 words
The polyester compositions of claim 1, wherein said polyphosphate is present in an amount of from 3 to 15 weight percent.
Claim 5
Dependent Claim
21 words
The polyester compositions of claim 3 wherein said polyphosphate is present in an amount of from 5 to 10 weight percent.
Claim 6
Dependent Claim
15 words
The polyester compositions of claim 1, wherein n has a value from 3 to 100.
Claim 7
Dependent Claim
15 words
The polyester compositions of claim 5, wherein n has a value from 3 to 10.
Claim 8
Dependent Claim
90 words
A fiber having an Oxygen Index greater than 20, comprising a melt blend of poly(ethylene terephthalate) with from 5 to 15 weight percent of a polyphosphate having the following general formula: ##STR25## wherein Ar is ##SPC1## R is --CH 3 or --C 2 H 5 or ##SPC2## n is from 3 to 100; and X is a monovalent radical selected from the group consisting of alkyl and aryl; Y is a monovalent radical selected from the group consisting of H, OH, and ##STR26## where X and R are as above.
Claim 9
Dependent Claim
90 words
A fiber having an Oxygen Index greater than 20, comprising a melt blend of poly(ethylene terephthalate) with from 5 to 15 weight percent of a polyphosphate having the following general formula: ##STR25## wherein Ar is ##SPC1## R is --CH 3 or --C 2 H 5 or ##SPC2## n is from 3 to 100; and X is a monovalent radical selected from the group consisting of alkyl and aryl; Y is a monovalent radical selected from the group consisting of H, OH, and ##STR26## where X and R are as above.
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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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |