US4960804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigid foams using blends of chlorofluorocarbons and alkyl alkanoates as blowing agent
Assignee: Bayer Corp
•
Filing: 1990-03-30
•
Granted: 1990-10-02
•
Expires: 2010-03-30
Abstract
Abstract The present invention is directed to the use of a mixture of specific chlorofluorocarbons and an alkyl alkanoate in the production of rigid, closed cell foams.
Inventors
- 👤 Herman P. Doerge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:27
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/149; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S264/00; Y10S264/05
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
In a process for the preparation of closed cell, rigid foams by reacting (a) a polyol component having a hydroxyl number of from about 200 to about 650, and (b) an organic polyisocyanate, in the presence of (c) a catalyst, (d) a foam stabilizer, and (e) a blowing agent, the improvement wherein the blowing agent comprises of a mixture of (i) from 95 to 50 percent by weight of a chlorofluorocarbon having an atmospheric boiling point of from about 74° F. to about 120° F. and (ii) from 5 to 50 percent by weight of an alkyl alkanoate having a molecular weight of no more than about 88, the percents by weight being based on the total weight of said mixture.
Claim 2
Dependent Claim
121 words
In a process for the preparation of closed cell, rigid foams by reacting (a) a polyol component having a hydroxyl number of from about 200 to about 650, and (b) an organic polyisocyanate, in the presence of (c) a catalyst, (d) a foam stabilizer, and (e) a blowing agent, the improvement wherein the blowing agent comprises of a mixture of (i) from 95 to 50 percent by weight of a chlorofluorocarbon having an atmospheric boiling point of from about 74° F. to about 120° F. and (ii) from 5 to 50 percent by weight of an alkyl alkanoate having a molecular weight of no more than about 88, the percents by weight being based on the total weight of said mixture.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein said chlorofluorocarbon is selected from the group consisting of trichloromonofluoromethane, 1,1-dichloro-2,2,2-trifluoroethane, 1,1-dichloro-1-fluoroethane, and trifluorotrichloroethane.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein said chlorofluorocarbon is selected from the group consisting of trichloromonofluoromethane and 1,1-dichloro-2,2,2-trifluoroethane.
Claim 5
Dependent Claim
10 words
The process of claim 3, wherein said chlorofluorocarbon is trichloromonofluoromethane.
Claim 6
Dependent Claim
26 words
The process of claim 1, wherein said alkanoate is selected from the group consisting of methyl formate, methyl acetate, ethyl formate, ethyl acetate, and butyl formate.
Claim 7
Dependent Claim
33 words
The process of claim 1 wherein said blowing agent comprises (i) from 90 to 70 percent by weight of said chlorofluorocarbon and (ii) from 10 to 30 percent by weight of said alkanoate.
Claim 8
Dependent Claim
27 words
The process of claim 1 wherein said blowing agent comprises a mixture of 18 parts by weight of methyl formate and 82 parts by weight of trichloromonofluoromethane.
References Cited (Backward Citations)
US2191196A
Cited
US3072582A
Cited
US3524825A
Cited
US3091551A
Cited
US3153002A
Cited
US3846347A
Cited
US3745203A
Cited
US3879315A
Cited
US4033910A
Cited
US4076644A
Cited
US4248975A
Cited
US4448951A
Cited
US4624970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |