US4265806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant thermoplastic synthetic resin
Assignee: Huels AG
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Filing: 1980-07-11
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Granted: 1981-05-05
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Expires: 2000-07-11
Abstract
Abstract A process for producing a solid, intumescent, phosphorus-containing flame retardant for thermoplastic synthetic resins, comprises evaporating to dryness the reaction product of (a) 1 mole of phosphoric acid, phosphorous acid or polyphosphoric acid, (b) 0.5-2 moles of ethylene oxide or glycol, and (c) 0.2-1 mole of melamine, and tempering the thus-obtained solid at 100 DEG -250 DEG C. The product so obtained can be added to such resins to render them flameproof without deleterious side effects such as discoloration.
Inventors
- 👤 Raban Grundmann
- 👤 Gunther Maahs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:51
CPC Classifications
C; C09; C09K; C09K21/00; C09K21/06; C09K21/12; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/5205; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A flame-retardant composition comprising a thermoplastic synthetic resin and an intumescent phosphorous-containing flame retardant prepared by the process comprising evaporating to dryness the reaction product of (a) 1 mole of phosphoric acid, phosphoric acid or polyphosphoric acid, (b) 0.5-2 moles of ethylene oxide or ethylene glycol, and (c) 0.2-1 mole of melamine, and tempering the thus-obtained solid at 100°-250° C.
Claim 2
Dependent Claim
60 words
A flame-retardant composition comprising a thermoplastic synthetic resin and an intumescent phosphorous-containing flame retardant prepared by the process comprising evaporating to dryness the reaction product of (a) 1 mole of phosphoric acid, phosphoric acid or polyphosphoric acid, (b) 0.5-2 moles of ethylene oxide or ethylene glycol, and (c) 0.2-1 mole of melamine, and tempering the thus-obtained solid at 100°-250° C.
Claim 3
Dependent Claim
50 words
The flame-retardant composition of claim 1 wherein the process comprises reacting (a) 1 mole of phosphoric acid, phosphorous acid or polyphosphoric acid, (b) 0.5-2 moles of ethylene oxide or glycol, and (c) 0.2-1 mole of melamine; evaporing to dryness the product so-produced; and tempering the thus-obtained solid at 100°-250° C.
Claim 4
Dependent Claim
13 words
The flame-retardant composition of claim 1 wherein the tempering is at 160°-200° C.
Claim 5
Dependent Claim
47 words
The flame-retardant composition of claim 1 wherein there is also reacted 1-50 mole percent, based on the amount of ethylene glycol or ethylene oxide, of a propane substituted by 2 or 3 OH groups, by an epoxy group, or by an OH group and an epoxy group.
Claim 6
Dependent Claim
39 words
The flame-retardant composition of claim 1 wherein there is also reacted 1-80 molar percent, based on the amount of melamine employed, of urea, dicyandiamide, methylurea, guanylurea, thiourea, guanylthiourea, phenylenediamine, piperazine, diethyltriamine, melamine aldehyde resin, polyamide, polyurethane or polyisocyanurate, etc.
Claim 7
Dependent Claim
18 words
The flame-retardant composition of claim 1, containing 5-60% by weight of the total mixture of the flame-retardant product.
Claim 8
Dependent Claim
12 words
The flame-retardant composition of claim 6, wherein the synthetic resin is polypropylene.
References Cited (Backward Citations)
US4010137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |