US4264744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of low molecular weight polyhydroxy compounds in methylene chloride blown polyurethane foams
Assignee: Dow Chemical Co
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Filing: 1979-12-26
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Granted: 1981-04-28
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Expires: 1999-12-26
Abstract
Abstract The use of methylene chloride as a blowing agent for resinous foams, particularly urethane foams is improved by incorporating a low molecular weight polyhydroxy aliphatic compound having more than two hydroxyl groups. Simultaneously with the addition the amount of gelling catalyst (e.g., stannous octoate) required to obtain good foam, particularly the very soft foams, is reduced over that required using the methylene chloride without the addition of the polyhydroxy compound. Similarly, when the polyhydroxy compound of this invention is used, smaller amounts of the gelling catalyst are employed for equal foam properties when the fluorinated halocarbons are employed either alone or in combination with the methylene chloride.
Inventors
- 👤 Olga L. Milovanovic
- 👤 Wolf Sehr
- 👤 Richard S. Sayad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:24
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J9/144; C08J9/145; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/161; C08G18/163; C08G18/165; C08G18/28; C08G18/65; C08G18/6505; C08G18/6511; C08G18/6517; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
In a method for preparing a polyurethane foam by reacting a polyether polyol having a molecular weight of from about 800 to about 5000, an isocyanate, water, a metal salt catalyst, an amine catalyst, a silicone surfactant and a halogenated hydrocarbon blowing agent, which blowing agent is at least 10% methylene chloride, the improvement which consists of incorporating from about 0.1 to about 1.5 parts per 100 parts of polyether polyol of a polyhydroxy compound having at least three hydroxyl groups and a molecular weight of not more than about 195, while employing from about 1.2 to about 1.8 times the metal salt catalyst of that used where a fluorocarbon is the sole blowing agent.
Claim 2
Dependent Claim
115 words
In a method for preparing a polyurethane foam by reacting a polyether polyol having a molecular weight of from about 800 to about 5000, an isocyanate, water, a metal salt catalyst, an amine catalyst, a silicone surfactant and a halogenated hydrocarbon blowing agent, which blowing agent is at least 10% methylene chloride, the improvement which consists of incorporating from about 0.1 to about 1.5 parts per 100 parts of polyether polyol of a polyhydroxy compound having at least three hydroxyl groups and a molecular weight of not more than about 195, while employing from about 1.2 to about 1.8 times the metal salt catalyst of that used where a fluorocarbon is the sole blowing agent.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein the polyhydroxy compound is glycerine.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein the polyhydroxy compound is an adduct of glycerine and propylene oxide.
Claim 5
Dependent Claim
18 words
The method of claim 3 wherein the adduct contains 1.6 moles of propylene oxide per mole of glycerine.
Claim 6
Dependent Claim
117 words
In a method for preparing a polyurethane foam by reacting a polyether polyol having a molecular weight of from about 800 to about 5000, an isocyanate, water, a metal salt catalyst, an amine catalyst, a silicone surfactant and a halogenated hydrocarbon blowing agent, which blowing agent is at least 10% methylene chloride, the improvement which consists of incorporating from about 0.1 to about 1.5 parts per 100 parts of polyether polyol of a polyhydroxy compound having at least three hydroxyl groups and a molecular weight of not more than about 195, and wherein from about 16 to about 32% less of the metal salt catalyst is employed than is employed in the absence of said polyhydroxy compound.
Claim 7
Dependent Claim
117 words
In a method for preparing a polyurethane foam by reacting a polyether polyol having a molecular weight of from about 800 to about 5000, an isocyanate, water, a metal salt catalyst, an amine catalyst, a silicone surfactant and a halogenated hydrocarbon blowing agent, which blowing agent is at least 10% methylene chloride, the improvement which consists of incorporating from about 0.1 to about 1.5 parts per 100 parts of polyether polyol of a polyhydroxy compound having at least three hydroxyl groups and a molecular weight of not more than about 195, and wherein from about 16 to about 32% less of the metal salt catalyst is employed than is employed in the absence of said polyhydroxy compound.
References Cited (Backward Citations)
US3914189A
Cited
US4150212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |