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US3879315A
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Process for the preparation of flexible polyurethane foams in the presence of alkyl alkanoate blowing agents
Assignee: Lyondell Chemical Technology LP
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Filing: 1973-06-18
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Granted: 1975-04-22
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Expires: 1993-06-18
Abstract
Abstract This application relates to the use of alkyl alkanoates having molecular weights no greater than 74 as blowing agents in the production of flexible slabstock polyurethane foams. Compared to the blowing agents (fluorocarbons) widely used commercially in producing such foams, the alkyl alkanoates are more efficient in that they produce a greater volume of gas per pound of blowing agent.
Inventors
- 👤 John Watkinson
- 👤 Ralph R Elrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:32
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/149; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
95 words
A process for producing flexible polyurethane foams which comprises reacting and foaming, at atmospheric pressure, a reaction mixture comprising: a. a polyether or polyester polyol component having a hydroxyl number from 28 to 150, b. an organic polyisocyanate component, c. a catalyst component for the reaction of (a) and (b) to form the polyurethane, d. a polyurethane foam stabilizer component, and e. a blowing agent component containing an alkyl alkanoate having a molecular weight no greater than 74, said alkyl alkanoate being selected from the group consisting of methyl formate, ethyl formate and methyl acetate.
Claim 2
Dependent Claim
95 words
A process for producing flexible polyurethane foams which comprises reacting and foaming, at atmospheric pressure, a reaction mixture comprising: a. a polyether or polyester polyol component having a hydroxyl number from 28 to 150, b. an organic polyisocyanate component, c. a catalyst component for the reaction of (a) and (b) to form the polyurethane, d. a polyurethane foam stabilizer component, and e. a blowing agent component containing an alkyl alkanoate having a molecular weight no greater than 74, said alkyl alkanoate being selected from the group consisting of methyl formate, ethyl formate and methyl acetate.
Claim 3
Dependent Claim
63 words
A PROCESS FOR PRODUCING FLEXIBLE POLYURETHANE FOAMS WHICH COMPRISES REACTING AND FOAMING, AT ATMOSPHERIC PRESSURE, AREACTION MIXTURE COMPRISING: A. A POLYETHER OR POLYESTER POLYOL COMPONENT HAVING AHYDROXYL NUMBER FROM 28 TO 150, B. AN ORGANIC POLYISOCYANATE COMPONENT, C. A CATALYST COMPONENT FOR THE REACTION OF (A) AND (B) TO FORM THE POLYURETHANE FOAM STABILIZER COMPONENT, AND D. A POLYURETHANE FOAM STABILIZER COMPONENT, AND
Claim 4
Dependent Claim
63 words
A PROCESS FOR PRODUCING FLEXIBLE POLYURETHANE FOAMS WHICH COMPRISES REACTING AND FOAMING, AT ATMOSPHERIC PRESSURE, AREACTION MIXTURE COMPRISING: A. A POLYETHER OR POLYESTER POLYOL COMPONENT HAVING AHYDROXYL NUMBER FROM 28 TO 150, B. AN ORGANIC POLYISOCYANATE COMPONENT, C. A CATALYST COMPONENT FOR THE REACTION OF (A) AND (B) TO FORM THE POLYURETHANE FOAM STABILIZER COMPONENT, AND D. A POLYURETHANE FOAM STABILIZER COMPONENT, AND
Claim 5
Dependent Claim
33 words
A BLOWING AGENT COMPONENT CONTAINING AN ALKYL ALKANOATE HAVING A MOLECULAR WEIGHT NO GREATER THAN 74, SAND ALKYL ALKANOATE BEING SELECTED FROM THE GROUP CONSISTING OF METHYL FORMATE, ETHYL FORMATE AND METHYL ACETATE.
Claim 6
Dependent Claim
33 words
A BLOWING AGENT COMPONENT CONTAINING AN ALKYL ALKANOATE HAVING A MOLECULAR WEIGHT NO GREATER THAN 74, SAND ALKYL ALKANOATE BEING SELECTED FROM THE GROUP CONSISTING OF METHYL FORMATE, ETHYL FORMATE AND METHYL ACETATE.
Claim 7
Dependent Claim
60 words
A process as claimed in claim 1 wherein the blowing agent component comprises from 5 to 50 parts by weight of the alkyl alkanoate and from 95 to 50 parts by weight of a fluorocarbon having a molecular weight from 87 to 187, said parts by weight being based on 100 parts by weight of the alkanoate and the fluorocarbon.
Claim 8
Dependent Claim
15 words
A process as claimed in claim 2 wherein the blowing agent component also contains water.
Claim 9
Dependent Claim
42 words
A process as claimed in claim 2 wherein the blowing agent component comprises an azeotrope composed of 18 parts by weight of methyl formate and 82 parts by weight of trichloromonofluoromethane per 100 parts by weight of the methyl formate and trichloromonofluoromethane.
Claim 10
Dependent Claim
15 words
A process a claimed in claim 4 wherein the blowing agent component also contains water.
Claim 11
Dependent Claim
30 words
A blend comprising a major amount of a polyether polyol or a polyester polyol and a minor amount of an alkyl alkanoate having a molecular weight no greater than 74.
Claim 12
Dependent Claim
30 words
A blend comprising a major amount of a polyether polyol or a polyester polyol and a minor amount of an alkyl alkanoate having a molecular weight no greater than 74.
Claim 13
Dependent Claim
66 words
A blend as claimed in claim 6 comprising a major amount of a polyether polyol or a polyester polyol and a minor amount of a mixture consisting of 5 to 50 parts by weight of an alkyl alkanoate having a molecular weight no greater than 74 and from 95 to 50 parts by weight of a fluorocarbon having a molecular weight of from 87 to 187.
Claim 14
Dependent Claim
37 words
A blend as claimed in claim 7 wherein the mixture consists of 18 parts by weight of methyl formate and 82 parts by weight of trichloromonofluoromethane per 100 parts by weight of the methyl formate and trichloromonofluoromethane.
Claim 15
Dependent Claim
34 words
A process as claimed in claim 2 wherein the blowing agent component is present in an amount of from 10 to 30 parts by weight per 100 parts by weight of the polyol component.
References Cited (Backward Citations)
US3072582A
Cited
US3745203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |