US4614754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigid polyurethane foams with constant or slightly decreasing strain with an increasing stress in compression
Assignee: BASF Corp
•
Filing: 1984-09-21
•
Granted: 1986-09-30
•
Expires: 2004-09-21
Abstract
Abstract Rigid polyurethane foams which exhibit constant or slightly decreasing strain with an increasing stress in compression are prepared employing from 30 to 60 parts of an alkoxylated toluenediamine polyol per 100 parts of polyol mixture. These foams may be employed in shoring up geological formations.
Inventors
- 👤 Donald L. Christman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:25
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/92; C09K8/94; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5033; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6688; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/0066; C08G2110/0083
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
122 words
A rigid polyurethane foam which exhibits nearly constant strain with increasing stress in compression wherein the rigid foam is the reaction product of a mixture of polyether polyols, an organic polyisocyanate, a catalyst and a silicone surfactant wherein said polyol mixture comprises an effective amount of an alkokxylated toluenediamine polyol having a structure of ##STR3## wherein w, x, y, and z represent numerals from 0 to 2; a, b, c, and d represent numerals from 1 to 5; w+x+y+z is from 2 to 5; a+b+c+d is from 2 to 5 and wherein w+x+y+z+a+b+c+d is not less than 5 nor more than 9 and a polyether polyol having a functionality from 2 to 8 and a molecular weight range from 200 to 1000.
Claim 2
Dependent Claim
122 words
A rigid polyurethane foam which exhibits nearly constant strain with increasing stress in compression wherein the rigid foam is the reaction product of a mixture of polyether polyols, an organic polyisocyanate, a catalyst and a silicone surfactant wherein said polyol mixture comprises an effective amount of an alkokxylated toluenediamine polyol having a structure of ##STR3## wherein w, x, y, and z represent numerals from 0 to 2; a, b, c, and d represent numerals from 1 to 5; w+x+y+z is from 2 to 5; a+b+c+d is from 2 to 5 and wherein w+x+y+z+a+b+c+d is not less than 5 nor more than 9 and a polyether polyol having a functionality from 2 to 8 and a molecular weight range from 200 to 1000.
Claim 3
Dependent Claim
25 words
The foam of claim 1 wherein the polyol mixture contains from 30 to 60 parts of alkoxylated toluenediamine polyol per 100 parts of polyol mixture.
Claim 4
Dependent Claim
21 words
The foam of claim 1 wherein the sum of w+x+y+z is about 4 and the sum of a+b+c+d is about 5.
References Cited (Backward Citations)
US3072582A
Cited
US3423344A
Cited
US3336245A
Cited
US3493525A
Cited
US4243759A
Cited
US4397966A
Cited
US4469822A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |