US4248975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigid shrink stable polyurethane foam derived from an adduct of an alkylene oxide having at least three carbon atoms and a polyol having at least four hydroxy groups and blown with a fluorinated-chlorinated alkane
Assignee: Witco Corp
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Filing: 1978-03-22
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Granted: 1981-02-03
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Expires: 1998-03-22
Abstract
Abstract A rigid shrink stable polyurethane foam having a K factor value below 0.22 and having substantially all closed cells is prepared from a reaction product of an arylene polyisocyanate and an addition product of an alkylene oxide having at least three carbon atoms and a polyol having at least four hydroxy groups using a chlorofluoro-lower alkane blowing agent.
Inventors
- 👤 Kenneth P. Satterly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:39
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4829; C08G2110/00; C08G2110/0008; C08G2110/0016; C08G2110/0025; C08G2110/0041; C08G2110/005; C08G2110/0058; C08G2110/0083
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
93 words
A rigid shrink stable polyurethane foam having a K factor value of less than 0.22 and in which foam substantially all of the cells are closed, the closed cell content being at least 90 percent, the cells being fine uniform cells, and which foam is prepared from the reaction product of: (a) an arylene polyisocyanate and (b) an addition product of an alkylene oxide having at least three carbon atoms and a polyol having at least four hydroxy groups in the presence of a volatile blowing agent essentially consisting of a chlorofluoro-lower alkane.
Claim 2
Dependent Claim
93 words
A rigid shrink stable polyurethane foam having a K factor value of less than 0.22 and in which foam substantially all of the cells are closed, the closed cell content being at least 90 percent, the cells being fine uniform cells, and which foam is prepared from the reaction product of: (a) an arylene polyisocyanate and (b) an addition product of an alkylene oxide having at least three carbon atoms and a polyol having at least four hydroxy groups in the presence of a volatile blowing agent essentially consisting of a chlorofluoro-lower alkane.
Claim 3
Dependent Claim
17 words
A rigid shrink stable polyurethane foam as defined in claim 1 wherein said lower alkane is monofluorotrichloromethane.
Claim 4
Dependent Claim
43 words
A rigid shrink stable polyurethane foam as defined in claim 1 wherein said foam is also prepared in the presence of a siloxy compound foam stabilizing agent or emulsifying agent selected from the group consisting of dimethyl polysiloxanes, phenylethoxy silanes and propoxy silnes.
Claim 5
Dependent Claim
27 words
A rigid shrink stable polyurethane foam as defined in claim 1 wherein said polyol is pentaerythritol, sorbitol, sucrose, or a mixture of two or more of same.
Claim 6
Dependent Claim
18 words
A rigid shrink stable polyurethane foam as defined in claim 1 wherein said arylene polyisocyanate is toluene diisocyanate.
Claim 7
Dependent Claim
19 words
A rigid shrink stable polyurethane foam as defined in claim 1 wherein said arylene polyisocyanate is p,p'-methylene diphenyl diisocyanate.
Claim 8
Dependent Claim
33 words
A rigid shrink stable polurethane foam as defined in claim 1 wherein said arylene polyisocyanate is toluene diisocyanate or p,p'-methylene diphenyl diisocyanate, and said blowing agent is a fluorine and chlorine containing methane.
Claim 9
Dependent Claim
28 words
A rigid shrink stable polyurethane foam as defined in claim 3 wherein said polyisocyanate is toluene diisocyanate or p,p'-methylene diphenyl diisocyanate, and said blowing agent is a fluorochloromethane.
Claim 10
Dependent Claim
16 words
A rigid shrink stable polyurethane foam as defined in claim 8 wherein said polyol is sucrose.
Claim 11
Dependent Claim
22 words
A rigid shrink stable polyurethane foam as defined in claim 1 wherein said foam has a K factor value of about 0.14.
Claim 12
Dependent Claim
17 words
A rigid shrink stable polyurethane foam as defined in claim 10 wherein said chlorofluoro-lower alkane is trichloromonofluoromethane.
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) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |