US4026829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible polyurethane foam
Assignee: Sanyo Chemical Industries Ltd
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Filing: 1975-08-04
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Granted: 1977-05-31
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Expires: 1995-08-04
Abstract
Abstract A flexible polyurethane foam which produces a reduced amount of smoke when in contact with a flame and which has flame resistant properties is produced by reacting, under foaming conditions, a polyetherpolyol having a hydroxyl number of 25 - 80 and, a primary hydroxyl group content of at least 10% and a liquid mixture of a polyoxyethylenepolyol modified polyisocyanate and a polyisocyanate monomer.
Inventors
- 👤 Tetsuya Samura
- 👤 Isao Ishikawa
- 👤 Kozaburo Nagata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:11
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/4841; C08G18/721; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/005; C08G2110/0083; Y; Y10; Y10S; Y10S521/00; Y10S521/903
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
88 words
In a process for producing a flexible polyurethane foam by reacting a polyetherpolyol and a polyisocyanate in the presence of a catalyst and a foaming agent, the improvement which comprises using, as the polyetherpolyol, a polyetherpolyol having an hydroxyl number of 25- 80 and a primary hydroxyl group content of at least 10% based on the total hydroxyl group content, and using, as the polyisocyanate, a liquid mixture of a polyisocyanate modified by reaction with a polyoxyethylenepolyol having a molecular weight of 200- 600 and a polyisocyanate monomer.
Claim 2
Dependent Claim
88 words
In a process for producing a flexible polyurethane foam by reacting a polyetherpolyol and a polyisocyanate in the presence of a catalyst and a foaming agent, the improvement which comprises using, as the polyetherpolyol, a polyetherpolyol having an hydroxyl number of 25- 80 and a primary hydroxyl group content of at least 10% based on the total hydroxyl group content, and using, as the polyisocyanate, a liquid mixture of a polyisocyanate modified by reaction with a polyoxyethylenepolyol having a molecular weight of 200- 600 and a polyisocyanate monomer.
Claim 3
Dependent Claim
21 words
The process of claim 1, wherein the hydroxyl number is 30- 70 and the primary hydroxyl group content is 10- 50%.
Claim 4
Dependent Claim
23 words
The process of claim 1, wherein the polyetherpolyol is an alkylene oxide adduct with a compound having at least two active hydrogen atoms.
Claim 5
Dependent Claim
14 words
The process of claim 1, wherein the polyetherpolyol is one tipped with ethylene oxide.
Claim 6
Dependent Claim
18 words
The process of claim 1, wherein the polyetherpolyol has a molecular weight of 1,000- 3,000 per hydroxyl group.
Claim 7
Dependent Claim
23 words
The process of claim 1, wherein the polyetherpolyol is used in a mixture with other compounds having at least two active hydrogen atoms.
Claim 8
Dependent Claim
26 words
The process of claim 1, wherein the liquid mixture has an NCO content of 20- 45% by weight based on the weight of the total mixture.
Claim 9
Dependent Claim
27 words
The process of claim 1, wherein the liquid mixture is one produced in a single step by reacting the polyoxyethylenepolyol with a large excess of polyisocyanate monomer.
Claim 10
Dependent Claim
42 words
The process of claim 1, wherein said polyetherpolyol is used in admixture with a compound having at least two active hydrogen atoms, a molecular weight of up to 200 and which is selected from the group consisting of polyhydric alcohols and polyamines.
Claim 11
Dependent Claim
18 words
The process of claim 9, wherein said compound having at least two active hydrogen atoms is diethylene glycol.
Claim 12
Dependent Claim
11 words
The flexible polyurethane foam produced by the process of 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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |