Patent US4071482A successfully refreshed from Google Patents.
US4071482A
Expired / Lapsed
US
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Reduced-friability, highly cross-linked, flame-resistant, polyurethane foams
Assignee: Lyondell Chemical Technology LP
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Filing: 1976-10-27
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Granted: 1978-01-31
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Expires: 1996-10-27
Abstract
Abstract Highly flame-resistant polyurethane foams of improved friability and reduced brittleness without a corresponding substantial increase in flame-spread or smoke-generation characteristics are prepared by incorporating into a foamable polyurethane composition an amount of a liquid organic carbonate, such as ethylene or propylene carbonate.
Inventors
- 👤 Henry S. Hopkins, Jr.
- 👤 Donald L. Vargo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:25
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0023; C08K; C08K5/00; C08K5/04; C08K5/10; C08J2375/00; C08J2375/04; C08J2375/08; Y; Y10; Y10S; Y10S521/00; Y10S521/903
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
103 words
An improved, rigid, cross-linked, polyurethane foam characterized by ASTM E-84 flame-spread values of 25 or less and low smoke-generation values of 400 or less, and having improved friability properties, which foam comprises the reaction product of a polyisocyanate and a halogenated polyether polyol having a hydroxyl number of about 300 to 600 and a functionality of three to eight, the reaction carried out in the presence of a catalyst and a blowing agent, and which foam contains from about 1 to 10% by weight of a liquid C 2 -C 6 alkylene carbonate having a boiling point of greater than about 230° C.
Claim 2
Dependent Claim
103 words
An improved, rigid, cross-linked, polyurethane foam characterized by ASTM E-84 flame-spread values of 25 or less and low smoke-generation values of 400 or less, and having improved friability properties, which foam comprises the reaction product of a polyisocyanate and a halogenated polyether polyol having a hydroxyl number of about 300 to 600 and a functionality of three to eight, the reaction carried out in the presence of a catalyst and a blowing agent, and which foam contains from about 1 to 10% by weight of a liquid C 2 -C 6 alkylene carbonate having a boiling point of greater than about 230° C.
Claim 3
Dependent Claim
32 words
The polyurethane foam of claim 1 which is characterized by a flame-spread value of about 20 to 25 and a smoke-generation value of a 4-inch foam of between about 200 and 400.
Claim 4
Dependent Claim
19 words
The polyurethane foam of claim 1 wherein the liquid carbonate is ethylene carbonate or propylene carbonate and mixtures thereof.
Claim 5
Dependent Claim
27 words
The polyurethane foam of claim 1 wherein the carbonate is propylene or ethylene carbonate and is present in an amount of from 2 to 8% by weight.
Claim 6
Dependent Claim
16 words
The polyurethane foam of claim 1 wherein the polyol is a chloro or bromo butylated polyol.
Claim 7
Dependent Claim
16 words
The polyurethane foam of claim 1 wherein the halogenated polyether polyol is a chlorobutylene oxide polyol.
Claim 8
Dependent Claim
16 words
The polyurethane foam of claim 1 wherein the blowing agent is a liquid fluorocarbon blowing agent.
Claim 9
Dependent Claim
20 words
The polyurethane foam of claim 1 which has a density of from about 1.0 to 3.0 pounds per cubic foot.
Claim 10
Dependent Claim
19 words
The polyurethane foam of claim 1 wherein the polyol contains from about 0.1 to 1.5% by weight of water.
Claim 11
Dependent Claim
102 words
An improved, rigid, cross-linked, polyurethane foam characterized by ASTM E-84 flame-spread values of about 20 to 25 or less and low smoke-generation values of a 4-inch foam of between 200 and 400 or less, and having improved friability properties, which foam comprises the reaction product of a polyisocyanate and a polyol comprising a chloro polyether polyol, and having a hydroxyl number of about 300 to 600 and a functionality of three to eight, the reaction carried out in the presence of a catalyst and a blowing agent, and which foam contains from about 2 to 8% by weight of a propylene carbonate.
Claim 12
Dependent Claim
102 words
An improved, rigid, cross-linked, polyurethane foam characterized by ASTM E-84 flame-spread values of about 20 to 25 or less and low smoke-generation values of a 4-inch foam of between 200 and 400 or less, and having improved friability properties, which foam comprises the reaction product of a polyisocyanate and a polyol comprising a chloro polyether polyol, and having a hydroxyl number of about 300 to 600 and a functionality of three to eight, the reaction carried out in the presence of a catalyst and a blowing agent, and which foam contains from about 2 to 8% by weight of a propylene carbonate.
Claim 13
Dependent Claim
14 words
The polyurethane foam of claim 10 wherein the polyol is a trichlorobutylene oxide polyol.
Claim 14
Dependent Claim
20 words
The polyurethane foam of claim 11 which has a density of from about 1.0 to 3.0 pounds per cubic foot.
Claim 15
Independent Claim
90 words
A method of preparing an improved polyurethane foam which is characterized by ASTM E-84 flame-spread values of 25 or less and low smoke-generation values of 400 or less, and having improved friability properties, which method comprises reacting a polyisocyanate and a halogenated polyether polyol having a hydroxyl number of about 300 to 600 and a functionality of three to eight, the reaction carried out in the presence of a catalyst and a blowing agent, and which foam contains from about 1 to 10% by weight of ethylene or propylene carbonate.
Claim 16
Independent Claim
90 words
A method of preparing an improved polyurethane foam which is characterized by ASTM E-84 flame-spread values of 25 or less and low smoke-generation values of 400 or less, and having improved friability properties, which method comprises reacting a polyisocyanate and a halogenated polyether polyol having a hydroxyl number of about 300 to 600 and a functionality of three to eight, the reaction carried out in the presence of a catalyst and a blowing agent, and which foam contains from about 1 to 10% by weight of ethylene or propylene carbonate.
Claim 17
Dependent Claim
13 words
The method of claim 13 wherein the polyol is a chlorobutylene oxide polyol.
Claim 18
Dependent Claim
18 words
The method of claim 14 wherein the polyol contains from about 0.1 to 1.5% by weight of water.
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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) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |