US4221875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame resistant polyurethane foam and the method for manufacturing the same
Assignee: Bridgestone Corp
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Filing: 1978-02-27
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Granted: 1980-09-09
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Expires: 1998-02-27
Abstract
Abstract According to the present invention polyurethane foams, can be obtained as flame resistant and non-corrosive product. The invention specifies the foaming of raw material mixture comprising polyhydroxyl compound, polyisocyanate, blowing agent and etc. to be carried out in the presence of melamine powder added thereto as novel flame retardant, the final products being inexpensive and suitable to be used as structural material, etc.
Inventors
- 👤 Toshio Yukuta
- 👤 Takumi Ishiwaka
- 👤 Noboru Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:11
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0028; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; C08G18/3842; C08G18/3851; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/906
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
70 words
In a rigid polyurethane foam obtained by reacting a polyhydroxyl compound with a polyisocyanate in the presence of blowing agent, silicone surfactant and catalyst, the improvement, which comprises; employment of hydrophobic polyetherpolyol having two or more hydroxyl groups per molecule as the polyhydroxyl compound and incorporation of 20 to 100 parts by weight of melamine per 100 parts by weight of the polyhydroxyl compound as a sole flame retardant component.
Claim 2
Dependent Claim
70 words
In a rigid polyurethane foam obtained by reacting a polyhydroxyl compound with a polyisocyanate in the presence of blowing agent, silicone surfactant and catalyst, the improvement, which comprises; employment of hydrophobic polyetherpolyol having two or more hydroxyl groups per molecule as the polyhydroxyl compound and incorporation of 20 to 100 parts by weight of melamine per 100 parts by weight of the polyhydroxyl compound as a sole flame retardant component.
Claim 3
Dependent Claim
21 words
The rigid polyurethane foam according to claim 1, wherein the polyetherpolyol is one containing 70 mole % or more propylene oxide.
Claim 4
Dependent Claim
52 words
The rigid polyurethane foam according to claim 1, wherein the polyetherpolyol is one produced by addition of an alkylene oxide mixture containing 70 mole % or more propylene oxide to an active hydrogen containing compound selected from the group consisting of ethylene glycol, glycerol, propylene glycol, diethylenetriamine, aromatic diamines, sucrose and sorbitol.
Claim 5
Dependent Claim
26 words
The rigid polyurethane foam according to claim 1, wherein the polyisocyanate is one selected from the group consisting of aromatic isocyanates, alicyclic isocyanates and aliphatic isocyanates.
Claim 6
Dependent Claim
73 words
In a method of manufacturing a rigid polyurethane foam by reacting a polyhydroxyl compound with a polyisocyanate in the presence of blowing agent, silicone surfactant and catalyst, the improvement, which comprises; employment of a hydrophobic polyetherpolyol having two or more hydroxyl groups per molecule as the polyhydroxyl compound and incorporation of 20 to 100 parts by weight of melamine per 100 parts by weight of the polyhydroxyl as the sole flame retardant component.
Claim 7
Dependent Claim
73 words
In a method of manufacturing a rigid polyurethane foam by reacting a polyhydroxyl compound with a polyisocyanate in the presence of blowing agent, silicone surfactant and catalyst, the improvement, which comprises; employment of a hydrophobic polyetherpolyol having two or more hydroxyl groups per molecule as the polyhydroxyl compound and incorporation of 20 to 100 parts by weight of melamine per 100 parts by weight of the polyhydroxyl as the sole flame retardant component.
Claim 8
Dependent Claim
19 words
The method according to claim 5, wherein the polyetherpolyol is one containing 70 mole % or more propylene oxide.
Claim 9
Dependent Claim
50 words
The method according to claim 5, wherein the polyetherpolyol is one produced by addition of an alkylene oxide mixture containing 70 mole % or more propylene oxide to an active hydrogen containing compound selected from the group consisting of ethylene glycol, glycerol, propylene glycol, diethylenetriamine, aromatic diamines, sucrose and sorbitol.
Claim 10
Dependent Claim
24 words
The method according to claim 5, wherein the polyisocyanate is one selected from the group consisting of aromatic isocyanates, alicyclic isocyanates and aliphatic isocyanates.
References Cited (Backward Citations)
US3399151A
Cited
US3462381A
Cited
US3824239A
Cited
US4098729A
Cited
US3897372A
Cited
US4139501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |