Patent US3839276A successfully refreshed from Google Patents.
US3839276A
Expired / Lapsed
US
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Flameproofing thermoplastic polymers by incorporating the reaction product of either urea or thiourea and phosphorus pentoxide
Assignee: BK Giulini GmbH
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Filing: 1972-10-03
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Granted: 1974-10-01
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Expires: 1992-10-03
Abstract
Abstract Substantially water-insoluble polyanionic compounds are obtained by heating urea or thiourea with phosphorus pentoxide until ammonia evolution ceases. The reaction products are useful flameproofing agents for thermoplastics.
Inventors
- 👤 H Rohlfs
- 👤 A Nebelung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:03
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/28; C01B25/38; C01B25/40; C01B25/405; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
THE PROCESS OF FLAMEPROOFING THERMOPLASTICS BY MIXING A THERMOPLASTIC MATERIAL WHICH IS SELECTED FROM THE GROUP CONSISTING OF A POLYAMIDE, A POLYOLEFIN, APOLYSTYRENE, AN ACRYLIC POLYMER AND A THERMOPLASTIC LINEAR POLYESTER WITH A SUBSTANTIALLY WATER INSOLUBLE POLYANIONIC COMPOUND OBTAINED BY HEATING AN ACID AMIDE COMPOUND SELECTED FROM THE GROUP CONSISTING OF UREA AND THIOUREA WITH PHOSPHORUS PENTOXIDE IN A MOLAR PROPORTION BETWEEN ABOUT 1.5:1.0 AND ABOUT 6.0:1.0 AT A TEMPERATURE BETWEEN ABOUT 250*C. AND ABOUT 400*C. UNTIL AMMONIA EVOLUTION CEASES.
Claim 2
Dependent Claim
80 words
THE PROCESS OF FLAMEPROOFING THERMOPLASTICS BY MIXING A THERMOPLASTIC MATERIAL WHICH IS SELECTED FROM THE GROUP CONSISTING OF A POLYAMIDE, A POLYOLEFIN, APOLYSTYRENE, AN ACRYLIC POLYMER AND A THERMOPLASTIC LINEAR POLYESTER WITH A SUBSTANTIALLY WATER INSOLUBLE POLYANIONIC COMPOUND OBTAINED BY HEATING AN ACID AMIDE COMPOUND SELECTED FROM THE GROUP CONSISTING OF UREA AND THIOUREA WITH PHOSPHORUS PENTOXIDE IN A MOLAR PROPORTION BETWEEN ABOUT 1.5:1.0 AND ABOUT 6.0:1.0 AT A TEMPERATURE BETWEEN ABOUT 250*C. AND ABOUT 400*C. UNTIL AMMONIA EVOLUTION CEASES.
Claim 3
Dependent Claim
27 words
The process of claim 1, in which the polyanionic compound is a compound obtained by heating the reaction components at a reaction temperature of about 350* C.
Claim 4
Dependent Claim
33 words
The process of claim 1, in which the polyanionic compound is a compound obtained by heating the acid amide compound and phosphorus pentoxide in a molar proportion between about 3.0:1.0 and about 4.0:1.0.
Claim 5
Dependent Claim
26 words
The process of claim 1, in which the amount of the polyanionic compound compounded with and incorporated in the thermoplastic material is at least 1 percent.
Claim 6
Dependent Claim
30 words
The process of claim 1, in which the amount of the polyanionic compound compounded with and incorporated in the thermoplastic material is between about 10 percent and about 15 percent.
Claim 7
Dependent Claim
14 words
The process of claim 1, in which the thermoplastic material is a thermoplastic polyamide.
Claim 8
Dependent Claim
60 words
Substantially flameproof thermoplastic material having incorporated therein as flameproofing agent a substantially water insoluble polyanionic compound obtained by heating an acid amide compound selected from the group consisting of urea and thiourea with phosphorus pentoxide in a molar proportion between about 1.5:1.0 and about 6.0:1.0 at a temperature between about 250* C. and about 400* C. until ammonia evolution ceases.
Claim 9
Dependent Claim
60 words
Substantially flameproof thermoplastic material having incorporated therein as flameproofing agent a substantially water insoluble polyanionic compound obtained by heating an acid amide compound selected from the group consisting of urea and thiourea with phosphorus pentoxide in a molar proportion between about 1.5:1.0 and about 6.0:1.0 at a temperature between about 250* C. and about 400* C. until ammonia evolution ceases.
Claim 10
Dependent Claim
17 words
The substantially flameproof thermoplastic material of claim 7, in which the thermoplastic material is a thermoplastic polyamide.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |