US4388420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a microcellular polyurethane foam with improved green strength
Assignee: BASF Corp
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Filing: 1981-11-30
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Granted: 1983-06-14
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Expires: 2001-11-30
Abstract
Abstract There is provided a process for preparing a microcellular foam with improved green strength properties comprising the step of reacting an organic polyisocyanate with polyalkylene ether polyol and from 1 to about 35 parts (by weight, per hundred parts of said polyol) of a chain extender in the presence of from about 0.1 to about 10.0 parts (by weight, per hundred parts of said polyol) of a compound selected from the group consisting of: ##STR1## wherein: (a) said polyol has an average functionality of from about 2 to about 8 and an average equivalent weight of from about 1000 to about 2700, and from about 0.8 to about 1.2 equivalents of said polyol are reacted per equivalent of isocyanate; (b) R is a divalent alkylene radical containing from about 1 to about 4 carbon atoms; and (c) R 1 , R 2 , R 3 , and R 4 are independently selected from the group consisting of hydroxyalkyl containing from about 1 to about 4 carbon atoms and from about 1 to about 2 hydroxyl groups.
Inventors
- 👤 Robert L. McBrayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:41
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6688; C08G18/08; C08G18/16; C08G18/18; C08G2110/00; C08G2110/0041; C08G2110/0066
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
A process for preparing a flexible, microcellular polyurethane foam with improved green strength, comprising: reacting together a polyalklyene polyether polyol having an average functionality of from about 2 to about 8 and an average equivalent weight of from about 1000 to about 2700, a chain extender and an organic polyisocyanate in the presence of an admixture of (1) a urethane--formation promoting organometallic catalyst and (2) an amine selected from the group consisting of N, N, N 1 , N 1 -tetrakis-(2-hydroxypropyl)ethylene diamine, triethanolamine and mixtures thereof, the amine being present in an amount ranging from about 0.1 to about ten parts by weight thereof per hundred parts by weight of polyol.
Claim 2
Dependent Claim
111 words
A process for preparing a flexible, microcellular polyurethane foam with improved green strength, comprising: reacting together a polyalklyene polyether polyol having an average functionality of from about 2 to about 8 and an average equivalent weight of from about 1000 to about 2700, a chain extender and an organic polyisocyanate in the presence of an admixture of (1) a urethane--formation promoting organometallic catalyst and (2) an amine selected from the group consisting of N, N, N 1 , N 1 -tetrakis-(2-hydroxypropyl)ethylene diamine, triethanolamine and mixtures thereof, the amine being present in an amount ranging from about 0.1 to about ten parts by weight thereof per hundred parts by weight of polyol.
Claim 3
Dependent Claim
101 words
A process for preparing a flexible, microcellular polyurethane foam with improved green strength, comprising: reacting together a polyalkylene polyether polyol having an average functionality of from about 2 to about 8 and an average equivalent weight of from about 1000 to about 2700, a chain extender and an organic polyisocyanate in the presence of an amine selected from the group consisting of N, N, N 1 , N 1 -tetrakis-(2-hydroxypropyl)ethylene dimaine, triethanolamine and mixtures thereof, the amine being present in an amount ranging from about 0.1 to about ten parts by weight thereof per hundred parts by weight of the polyol.
Claim 4
Dependent Claim
101 words
A process for preparing a flexible, microcellular polyurethane foam with improved green strength, comprising: reacting together a polyalkylene polyether polyol having an average functionality of from about 2 to about 8 and an average equivalent weight of from about 1000 to about 2700, a chain extender and an organic polyisocyanate in the presence of an amine selected from the group consisting of N, N, N 1 , N 1 -tetrakis-(2-hydroxypropyl)ethylene dimaine, triethanolamine and mixtures thereof, the amine being present in an amount ranging from about 0.1 to about ten parts by weight thereof per hundred parts by weight of the polyol.
Claim 5
Dependent Claim
31 words
The process of claim 1 wherein the amine is present in an amount ranging from about 0.1 to about five parts by weight thereof per hundred parts by weight of polyol.
Claim 6
Dependent Claim
19 words
The process of claim 2 wherein the amine is employed in a 1:1 equivalent weight ratio admixture with dimethylethanolamine.
Claim 7
Dependent Claim
18 words
The process of claim 2 wherein the amine is N, N, N 1 , N 1 -tetrakis(2-hydroxypropyl)ethylene diamine.
Claim 8
Dependent Claim
53 words
The process of claim 2 wherein: (a) the polyol has an average functionality of from about 2 to about 8 and an average equivalent weight of from about 1000 to about 2700; (b) the chain extender is 1,4-butanediol, and (e) the amine is N, N, N 1 , N 1 ,-tetrakis (2-hydroxypropyl)ethylene diamine.
References Cited (Backward Citations)
US3112281A
Cited
US3050477A
Cited
US3471416A
Cited
US3476933A
Cited
US3580868A
Cited
US3620986A
Cited
US3894972A
Cited
US3922238A
Cited
US4145318A
Cited
US4273885A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |