Patent US4239856A successfully refreshed from Google Patents.
US4239856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing high-resilient flexible urethane foams
Assignee: Dow Chemical Co
•
Filing: 1978-08-28
•
Granted: 1980-12-16
•
Expires: 1998-08-28
Abstract
Abstract A stable high-resilient (HR) flexible polyurethane foam may be made from an MDI type isocyanate, a polyether polyol and an amount of diethanolamine in an amount effective for preventing splits in the finished foam. The foams disclosed herein use water as the blowing agent. The disclosed foams have excellent properties and process without splitting.
Inventors
- 👤 Richard L. Rowton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:22
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6688; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G18/7671; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/005; C08G2110/0058; C08G2110/0083; Y; Y10; Y10S; Y10S521/00; Y10S521/904
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
78 words
In a process of preventing splits in high-resilient, flexible polyurethane foam which is the reaction product of a polyether triol of about 5000 to 7000 molecular weight and a methylene diphenyl diisocyanate modified to assume a liquid form and in the presence of water as the only blowing agent, the improvement which comprises reacting the components in the presence of from about 0.2 to about 2.0 parts by weight of diethanolamine per 100 parts by weight of triol.
Claim 2
Dependent Claim
78 words
In a process of preventing splits in high-resilient, flexible polyurethane foam which is the reaction product of a polyether triol of about 5000 to 7000 molecular weight and a methylene diphenyl diisocyanate modified to assume a liquid form and in the presence of water as the only blowing agent, the improvement which comprises reacting the components in the presence of from about 0.2 to about 2.0 parts by weight of diethanolamine per 100 parts by weight of triol.
Claim 3
Dependent Claim
17 words
A process as in claim 1 wherein the polyether triol has a molecular weight of about 5500.
References Cited (Backward Citations)
CA717124A
Cited
US3394164A
Cited
US3476933A
Cited
US3933701A
Cited
US4119582A
Cited
US4150206A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |