Patent US4242240A successfully refreshed from Google Patents.
US4242240A
Expired / Lapsed
US
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Compositions intended for the flameproofing of plastics
Assignee: Rhone Poulenc Industries SA
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Filing: 1978-03-23
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Granted: 1980-12-30
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Expires: 1998-03-23
Abstract
Abstract Compositions based on red phosphorus and a phenolformaldehyde polycondensate. These compositions contain from 50 to 95% by weight of red phosphorus and from 5 to 50% by weight of a thermoplastic phenol-formaldehyde polycondensate of molecular weight between 120 and 1,500, wherein the molar ratio of formaldehyde to phenol is between 0.7 and 0.9. These compositions are intended for the flameproofing of plastics and do not evolve toxic products during use.
Inventors
- 👤 Jacqueline Cerny
- 👤 Gilbert Vivant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:24
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/04; C08K9/10; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
94 words
Compositions intended for the flameproofing of plastics, which do not evolve toxic products during the processing of these plastics, characterized in that they contain: (a) from 50 to 95% by weight of red phosphorus in the form of a powder having a mean particle size of less than 200μ; (b) from 5 to 50% by weight of a thermoplastic phenol-formaldehyde polycondensate of molecular weight between 120 and 1,500, wherein the molar ratio of formaldehyde to phenol is between 0.7 and 0.9 and in which the particles of red phosphorus are coated with the polycondensate.
Claim 2
Dependent Claim
94 words
Compositions intended for the flameproofing of plastics, which do not evolve toxic products during the processing of these plastics, characterized in that they contain: (a) from 50 to 95% by weight of red phosphorus in the form of a powder having a mean particle size of less than 200μ; (b) from 5 to 50% by weight of a thermoplastic phenol-formaldehyde polycondensate of molecular weight between 120 and 1,500, wherein the molar ratio of formaldehyde to phenol is between 0.7 and 0.9 and in which the particles of red phosphorus are coated with the polycondensate.
Claim 3
Dependent Claim
44 words
Compositions according to claim 1, characterized in that they furthermore contain up to 100% by weight, relative to the red phosphorus, of a metal oxide chosen from the group consisting of the oxides of copper, zinc, silver, iron, antimony, vanadium, tin, titanium and magnesium.
Claim 4
Dependent Claim
27 words
Flameproofed compositions of plastics, characterized in that they contain from 0.2 to 20% by weight relative to the plastic of a flameproofing composition according to claim 1.
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) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |