Patent US4960803A successfully refreshed from Google Patents.
US4960803A
Expired / Lapsed
US
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Fire retardant foam materials
Assignee: Individual
•
Filing: 1988-07-29
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Granted: 1990-10-02
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Expires: 2008-07-29
Abstract
Abstract A method is provided for making a fire retardant rigid polyurethane foam. The method comprises reacting, in the presence of a non-metallic catalyst: (a) a polyol having a molecular weight between about 200 and about 6000; (b) polyisocyanate; (c) a foaming agent; (d) a surfactant; and (e) a single salt consisting of ammonium phosphate.
Inventors
- 👤 Laszlo A. Muhl
- 👤 Thomas I. Omori
- 👤 John Milligan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:44
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/32; Y; Y10; Y10S; Y10S521/00; Y10S521/906
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
121 words
A fire retardant polyurethane foam, prepared by the process of reacting in the presence of a non-metallic catalyst, (a) from about 80 parts to about 120 parts by weight of a polyol having a molecular weight of from about 200 to about 6000; (b) from about 80 parts to about 120 parts by weight of a polyisocyanate; (c) from about 10 parts to about 50 parts by weight of a foaming agent; (d) from about 0.05 to about 2.0 parts by weight of a surfactant; (e) a flame-retardant consisting essentially of from about 20 parts to about 200 parts by weight of a single salt consisting of ammonium phosphate having a particle size less than or equal to about I50 mesh.
Claim 2
Dependent Claim
121 words
A fire retardant polyurethane foam, prepared by the process of reacting in the presence of a non-metallic catalyst, (a) from about 80 parts to about 120 parts by weight of a polyol having a molecular weight of from about 200 to about 6000; (b) from about 80 parts to about 120 parts by weight of a polyisocyanate; (c) from about 10 parts to about 50 parts by weight of a foaming agent; (d) from about 0.05 to about 2.0 parts by weight of a surfactant; (e) a flame-retardant consisting essentially of from about 20 parts to about 200 parts by weight of a single salt consisting of ammonium phosphate having a particle size less than or equal to about I50 mesh.
Claim 3
Dependent Claim
22 words
The polyurethane foam of claim 1, wherein the salt is comprised of a blend of two different sizes of ammonium phosphate particles.
Claim 4
Dependent Claim
27 words
The polyurethane foam of claim 2, wherein the blend is a mixture of ammonium particles having a 150 mesh size and particles having a 300 mesh size.
Claim 5
Dependent Claim
25 words
The polyurethane foam of claim 3, wherein the blend is a bimodal distribution and contains approximately equal amounts by weight of the two particle sizes.
Claim 6
Dependent Claim
13 words
The polyurethane foam of claim 1, wherein the ammonium phosphate is agricultural grade.
Claim 7
Dependent Claim
22 words
The polyurethane foam of claim 1, wherein the ammonium phosphate has a minimum assay for phosphorous pentoxide of at least 47 percent.
Claim 8
Dependent Claim
21 words
The polyurethane foam of claim 1, wherein the ammonium phosphate has an ammonium nitrogen content of at least about 10 percent.
Claim 9
Dependent Claim
124 words
A process for the preparation of a fire retardant polyurethane foam, which comprises reacting in the presence of a non-metallic catalyst; (a) from about 80 parts to about 120 parts by weight of a polyol having a molecular weight of from about 200 to about 6000; (b) from about 80 parts to about 120 parts by weight of a polyisocyanate; (c) from about 10 parts to about 50 parts by weight of a foaming agent; (d) from about 0.05 to about 2.0 parts by weight of a surfactant; (e) a flame-retardant consisting essentially of from about 20 parts of about 200 parts by weight of a single salt consisting of ammonium phosphate having a particle size less than or equal to about 150 mesh.
Claim 10
Dependent Claim
124 words
A process for the preparation of a fire retardant polyurethane foam, which comprises reacting in the presence of a non-metallic catalyst; (a) from about 80 parts to about 120 parts by weight of a polyol having a molecular weight of from about 200 to about 6000; (b) from about 80 parts to about 120 parts by weight of a polyisocyanate; (c) from about 10 parts to about 50 parts by weight of a foaming agent; (d) from about 0.05 to about 2.0 parts by weight of a surfactant; (e) a flame-retardant consisting essentially of from about 20 parts of about 200 parts by weight of a single salt consisting of ammonium phosphate having a particle size less than or equal to about 150 mesh.
Claim 11
Dependent Claim
21 words
The process of claim 8, wherein the salt is comprised of a blend of two different sizes of ammonium phosphate particles.
Claim 12
Dependent Claim
27 words
The process of claim 9, wherein the blend is a mixture of ammonium phosphate particles having a 150 mesh size and particles having a 300 mesh size.
Claim 13
Dependent Claim
24 words
The process of claim 10, wherein the blend is a bimodal distribution and contains approximately equal amounts by weight of the two particle sizes.
Claim 14
Dependent Claim
12 words
The process of claim 8, wherein the ammonium phosphate is agricultural grade.
Claim 15
Dependent Claim
21 words
The process of claim 8, wherein the ammonium phosphate has a minimum assay for phosphorous pentoxide of at least 47 percent.
Claim 16
Dependent Claim
20 words
The process of claim 8, wherein the ammonium phosphate has an ammonium nitrogen content of at least about 10 percent.
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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) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |