US4144386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of flexible polyurethane foams
Assignee: Montedison SpA
•
Filing: 1977-03-15
•
Granted: 1979-03-13
•
Expires: 1997-03-15
Abstract
Abstract There is provided a process for the preparation of flexible polyurethane foams having excellent softness, the process comprising reacting in the presence of a foaming agent, (A) a polyhydroxyl containing polyether including from 75 to 90% by weight of ethylene oxide, the polyether having a functionality equal to or greater than 2, an equivalent weight of between 700 and 2,200 for each hydroxyl group, from 2 to 35 percent of primary hydroxyl groups, based on the total number of hydroxyl groups present and a ratio of weight percent value of ethylene oxide to the percent value of primary hydroxyl groups based on the total number of hydroxyl groups present of between 2.1 and 42.5, and (B) a polyisocyanate which is the product of the partial polymerization of toluene diisocyanate and a polyhydroxyl containing polyether which includes propylene oxide, wherein (A) and (B) are present respectively in amounts such that the molar ratio of isocyanate groups to hydroxyl groups, NCO/OH, is equal to or greater than 1, preferably from 1:1 to 1.15:1.
Inventors
- 👤 Salvatore Consoli
- 👤 Franco Galati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:55
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/4845; C08G18/08; C08G18/10; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/005; C08G2110/0083; Y; Y10; Y10S; Y10S521/00; Y10S521/914
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
199 words
A process for the preparation of a flexible polyurethane foam, the process comprising reacting in the presence of a foaming agent (A) a polyhydroxyl containing polyether which includes from 75 to 90% by weight of ethylene oxide, said polyether being terminated with propylene oxide only and having been prepared by the polycondensation of a mixture of propylene oxide and ethylene oxide with a compound having at least two active hydrogen atoms said polyether having (i) a functionality equal to or greater than 2; (ii) an equivalent weight of between 700 and 2,200 for each hydroxyl group; (iii) from 2 to 35 percent of primary hydroxyl groups, based on the total number of hydroxyl groups present, and (iv) a ratio of weight percent value of ethylene oxide to the percent value of primary hydroxyl groups based on the total number of hydroxyl groups present of between 2.1 and 42.5; and (B) a polyisocyanate which is the product of the partial polymerization of toluene diisocyanate and a polyhydroxyl containing polyether which contains propylene oxide, wherein components (A) and (B) are present in amounts such that the molar ratio of isocyanate groups to hydroxyl groups is equal to or greater than 1.
Claim 2
Dependent Claim
199 words
A process for the preparation of a flexible polyurethane foam, the process comprising reacting in the presence of a foaming agent (A) a polyhydroxyl containing polyether which includes from 75 to 90% by weight of ethylene oxide, said polyether being terminated with propylene oxide only and having been prepared by the polycondensation of a mixture of propylene oxide and ethylene oxide with a compound having at least two active hydrogen atoms said polyether having (i) a functionality equal to or greater than 2; (ii) an equivalent weight of between 700 and 2,200 for each hydroxyl group; (iii) from 2 to 35 percent of primary hydroxyl groups, based on the total number of hydroxyl groups present, and (iv) a ratio of weight percent value of ethylene oxide to the percent value of primary hydroxyl groups based on the total number of hydroxyl groups present of between 2.1 and 42.5; and (B) a polyisocyanate which is the product of the partial polymerization of toluene diisocyanate and a polyhydroxyl containing polyether which contains propylene oxide, wherein components (A) and (B) are present in amounts such that the molar ratio of isocyanate groups to hydroxyl groups is equal to or greater than 1.
Claim 3
Dependent Claim
32 words
The process according to claim 1 wherein said compound having at least two active hydrogen atoms is selected from among glycols, triols, tetrols, alkanolamines, polyamines, or mixtures of any of the foregoing.
Claim 4
Dependent Claim
31 words
The process according to claim 2 wherein the glycol is dipropylene glycol, the triol is glycerine or trimethylolpropane, the tetrol is pentaerythritol, the polyamine is ethylenediamine and the alkanolamine is triethanolamine.
Claim 5
Dependent Claim
20 words
The process according to claim 1 wherein said polyhydroxyl containing polyether (A) has a functionality of between 3 and 4.
Claim 6
Dependent Claim
36 words
The process according to claim 1 wherein said polyhydroxyl containing polyether (A) and said polyisocyanate (B) are present in amounts such that the molar ratio of isocyanate groups to hydroxyl groups is between 1:1 and 1.15:1.
Claim 7
Dependent Claim
23 words
The process according to claim 1 wherein the polyhydroxyl containing polyether of component (B) has a functionality equal to or greater than 2.
Claim 8
Dependent Claim
22 words
The process according to claim 6 wherein the polyhydroxyl containing polyether of component (B) has a functionality of between 3 and 4.
Claim 9
Dependent Claim
23 words
The process according to claim 1 wherein the polyhydroxyl containing polyether of component (B) has an equivalent weight of between 400 and 1,500.
Claim 10
Dependent Claim
23 words
The process according to claim 8 wherein the polyhydroxyl containing polyether of component (B) has an equivalent weight of between 1,000 and 1,500.
Claim 11
Dependent Claim
21 words
The process according to claim 1 wherein said polyisocyanate (B) contains from 15 to 40% by weight of free isocyanate groups.
Claim 12
Dependent Claim
21 words
The process according to claim 10 wherein said polyisocyanate (B) contains from 20 to 35% by weight of free isocyanate groups.
Claim 13
Dependent Claim
24 words
The process according to claim 1 wherein the polyhydroxyl containing polyether of component (B) also includes up to 3% by weight of ethylene oxide.
Claim 14
Dependent Claim
12 words
The process according to claim 1 wherein the foaming agent is water.
Claim 15
Dependent Claim
12 words
The process according to claim 1 wherein the foaming agent is trichlorofluoromethane.
Claim 16
Dependent Claim
16 words
The process according to claim 1 which is carried out in the presence of a catalyst.
Claim 17
Dependent Claim
19 words
The process according to claim 15 wherein said catalyst comprises a metal catalyst in combination with an amine catalyst.
Claim 18
Dependent Claim
13 words
The process according to claim 1 which includes a minor amount of silicone.
Claim 19
Dependent Claim
11 words
A flexible polyurethane foam prepared by the method of claim 1.
References Cited (Backward Citations)
CA665758A
Cited
US3042631A
Cited
US3461086A
Cited
US3546145A
Cited
US3821130A
Cited
US4008189A
Cited
US4026829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |