US4774268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of flame resistant polyurethane compositions
Assignee: Dr Wolman GmbH
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Filing: 1988-01-20
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Granted: 1988-09-27
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Expires: 2008-01-20
Abstract
Abstract Flame resistant foams and other compositions containing polyurethane and/or polyisocyanurate groups are prepared by reacting an organic polyisocyanate with a polyol in the presence of flame retardants, catalysts, blowing agents as well as optionally chain extenders, cross-linkers auxiliaries and additives. The flame retardents comprise a phenol or melamine formaldehyde condensate, pentaerythritol as well as ammonium phosphate and preferably in addition dicyandiamide.
Inventors
- 👤 Hans-Norbert Marx
- 👤 Wendelin Hettler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:32
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/32; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/4009; C08G18/4027; C08G18/65; C08G18/6505; C08G18/6511; C08K5/00; C08K5/16; C08K5/29; C08K5/31; C08L; C08L75/00; C08L75/04; C08G2115/00; C08G2115/02; Y; Y10; Y10S; Y10S521/00; Y10S521/902; Y10S521/906; Y10S521/907
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
63 words
A flame-resistant composition containing polyurethane and/or polyisocyanurate groups, comprising reacting an organic polyisocyanate with a polyol in the presence of flame retardants, catalysts, blowing agents, chain extending agents, crosslinking agents, auxiliary agents and additives, wherein the flame retardant comprises: (a) a phenol- or melamine formaldehyde condensate, (b) a carbohydrate or multivalent alcohol, (c) ammonium phosphate, and (d) a heat reducing organic nitrogen compound.
Claim 2
Dependent Claim
63 words
A flame-resistant composition containing polyurethane and/or polyisocyanurate groups, comprising reacting an organic polyisocyanate with a polyol in the presence of flame retardants, catalysts, blowing agents, chain extending agents, crosslinking agents, auxiliary agents and additives, wherein the flame retardant comprises: (a) a phenol- or melamine formaldehyde condensate, (b) a carbohydrate or multivalent alcohol, (c) ammonium phosphate, and (d) a heat reducing organic nitrogen compound.
Claim 3
Dependent Claim
53 words
The composition of claim 1 wherein the flame retardant comprises from (a) 10 to 50 weight percent of a phenol - and/or melamine-formaldehyde condensate, (b) 5 to 40 weight percent of pentaerythritol, and (c) 10 to 60 weight percent of ammonium phosphate, of the total of 100 weight percent of the flame retardant.
Claim 4
Dependent Claim
25 words
A process for the preparation of the composition of claim 1 wherein the flame retardant is added to the polyol before mixing the reactants together.
Claim 5
Dependent Claim
25 words
A process for the preparation of the composition of claim 2 wherein the flame retardant is added to the polyol before mixing the reactants together.
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) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |