US5013766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closed cell, rigid polyurethane foam
Assignee: Bayer Corp
•
Filing: 1989-09-15
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Granted: 1991-05-07
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Expires: 2009-09-15
Abstract
Abstract The present invention is directed to the discovery that relatively long chain polyols, which are typically used to produce flexible foams, can be used to produced closed cell rigid polyurethane foams.
Inventors
- 👤 Lotar H. Hanusa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:40
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G18/6677; C08G18/40; C08G18/48; C08G18/4804; C08G18/6681; C08G18/6688; C08G2110/00; C08G2110/0025; C08G2110/0033; C08G2110/0041; C08G2110/005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
A process for preparing a rigid, closed cell polyurethane foam comprising reacting: (a) an organic di and/or polyisocyanate and (b) a polyol mixture comprising: (i) a polyol having an hydroxyl functionality of from 3 to 8 and an hydroxyl number of from about 300 to about 800, and (ii) from about 10 to about 90 parts by weight per 100 parts by weight of polyol (i), of a polyol having an hydroxyl functionality of from 2 to 3 and an hydroxyl number of from about 25 to about 115, in the presence of (c) a catalyst, (d) a blowing agent, and (e) a foam stabilizer, at an isocyanate index of form about 70 to about 115.
Claim 2
Dependent Claim
116 words
A process for preparing a rigid, closed cell polyurethane foam comprising reacting: (a) an organic di and/or polyisocyanate and (b) a polyol mixture comprising: (i) a polyol having an hydroxyl functionality of from 3 to 8 and an hydroxyl number of from about 300 to about 800, and (ii) from about 10 to about 90 parts by weight per 100 parts by weight of polyol (i), of a polyol having an hydroxyl functionality of from 2 to 3 and an hydroxyl number of from about 25 to about 115, in the presence of (c) a catalyst, (d) a blowing agent, and (e) a foam stabilizer, at an isocyanate index of form about 70 to about 115.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein component (b) (ii) is present in an amount of from about 15 to about 40 parts by weight per 100 parts by weight of polyol (i).
Claim 4
Dependent Claim
15 words
The process of claim 1, wherein said index is from about 95 to about 105.
Claim 5
Dependent Claim
39 words
The process of claim 1, wherein all or a portion of polyol (ii) is first reacted with said isocyanate to form an isocyanate terminated prepolymer which is then reacted with polyol (i) and any remaining portion of polyol (ii).
Claim 6
Dependent Claim
10 words
A polyurethane foam produced by the process of claim 1.
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) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |