Patent US3856718A successfully refreshed from Google Patents.
US3856718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded flexible polyurethane foams
Assignee: Honeywell International Inc
•
Filing: 1972-09-18
•
Granted: 1974-12-24
•
Expires: 1992-09-18
Abstract
Abstract Cold molded one-shot polyurethane flexible, high resilient foams are prepared by conducting the reaction of a polyisocyanate with a certain polyether polyol in the presence of a catalyst, a blowing agent comprising water and a curing agent comprising, as the major component thereof, a certain isocyanurate polyol.
Inventors
- 👤 B Taub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:49
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4804; C08G18/482; C08G18/50; C08G18/5021; C08G18/5054; C08G18/5063; C08G18/65; C08G18/66; C08G18/6666; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/005; C08G2110/0058; C08G2110/0083; Y; Y10; Y10S; Y10S521/00; Y10S521/904
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
120 words
A POLYURETHANE FOAM HAVING A DENSITY IN EXCESS OF 1.75 LB/FT3, A TENSILE STRENGTH OF AT LEAST 12 PSI, AN ELONGATION OF AT LEAST 130%, A TEAR STRENGTH OF AT LEAST 1.5 LB/IN, A SAG FACTOR OF ABOVE ABOUT 2.5, AND COMPRESSION SET AT 50%, AFTER HUMID AGING, OF NOT GREATER THAN 30, PREPARED BY THE PROCESS COMPRISING EFFECTING REACTION BETWEEN AN ORGANIC POLYISOCYANATE SELECTED FROM THE GROUP CONSISTING OF AN UNDISTILLED TOLUENE DIAMINE PHOSGENATION PRODUCT, A POLYARYL-POLYALKYLENE POLYISOCYANATE AND A BENZENE TRIISOCYANATE, AND A POLYETHER POLYOL HAVING A NUMBER AVERAGE MOLECULAR WEIGHT BETWEEN ABOUT 3,000 AND 7,500 IN THE PRESENCE OF A CATALYST, A BLOWING AGENT COMPRISING WATER AND, AS CURING AGENT AN ISOCYANURATE POLYOL CORRESPONDING TO THE FORMULA:
Claim 2
Dependent Claim
120 words
A POLYURETHANE FOAM HAVING A DENSITY IN EXCESS OF 1.75 LB/FT3, A TENSILE STRENGTH OF AT LEAST 12 PSI, AN ELONGATION OF AT LEAST 130%, A TEAR STRENGTH OF AT LEAST 1.5 LB/IN, A SAG FACTOR OF ABOVE ABOUT 2.5, AND COMPRESSION SET AT 50%, AFTER HUMID AGING, OF NOT GREATER THAN 30, PREPARED BY THE PROCESS COMPRISING EFFECTING REACTION BETWEEN AN ORGANIC POLYISOCYANATE SELECTED FROM THE GROUP CONSISTING OF AN UNDISTILLED TOLUENE DIAMINE PHOSGENATION PRODUCT, A POLYARYL-POLYALKYLENE POLYISOCYANATE AND A BENZENE TRIISOCYANATE, AND A POLYETHER POLYOL HAVING A NUMBER AVERAGE MOLECULAR WEIGHT BETWEEN ABOUT 3,000 AND 7,500 IN THE PRESENCE OF A CATALYST, A BLOWING AGENT COMPRISING WATER AND, AS CURING AGENT AN ISOCYANURATE POLYOL CORRESPONDING TO THE FORMULA:
Claim 3
Dependent Claim
23 words
The foam of claim 1 wherein the polyisocyanate is a toluene diamine phosgenation product having an amine equivalent between about 90 and 125.
Claim 4
Dependent Claim
28 words
The foam of claim 2 wherein the polyether polyol is a polyethylene ether triol or diol or mixture thereof having a number average molecular weight between about 4,500-6,700.
Claim 5
Dependent Claim
17 words
The foam of claim 2 wherein the isocyanurate polyol employed as curing agent corresponds to the formula:
Claim 6
Dependent Claim
22 words
The foam of claim 4 wherein, in said formula, x is 1 to 5 and y and z are 0 to 5.
Claim 7
Dependent Claim
21 words
The foam of claim 4 wherein, in said foRmula, R is methyl and each of x, y and z is 1.
Claim 8
Dependent Claim
21 words
The foam of claim 4 wherein, in said formula, R is hydrogen and each of x, y and z is 1.
Claim 9
Dependent Claim
26 words
The foam of claim 1 wherein said reaction is conducted in the presence of a minor amount of a primary diamine as an auxiliary curing agent.
Claim 10
Dependent Claim
29 words
The foam of claim 8 wherein the primary diamine is present in amount of from about 1 to 10%, by weight, based on the weight of the polyether polyol.
Claim 11
Dependent Claim
101 words
A polyurethane foam having a density in excess of 1.75 lb/ft3, a tensile strength of at least 12 psi, an elongation of at least 130%, a tear strength of at least 1.5 lb/in, a sag factor of above about 2.5, and compression set at 50%, after humid aging, of not greater than 30, prepared by the process comprising effecting reaction between a tolylene diisocyanate and a polyether polyol having a number average molecular weight between about 3,000 and 7,500 in the presence of a catalyst, a blowing agent comprising water and as curing agent, an isocyanurate polyol corresponding to the formula:
Claim 12
Dependent Claim
101 words
A polyurethane foam having a density in excess of 1.75 lb/ft3, a tensile strength of at least 12 psi, an elongation of at least 130%, a tear strength of at least 1.5 lb/in, a sag factor of above about 2.5, and compression set at 50%, after humid aging, of not greater than 30, prepared by the process comprising effecting reaction between a tolylene diisocyanate and a polyether polyol having a number average molecular weight between about 3,000 and 7,500 in the presence of a catalyst, a blowing agent comprising water and as curing agent, an isocyanurate polyol corresponding to the formula:
Claim 13
Dependent Claim
29 words
The foam of claim 10 wherein the primary diamine is present in amount of from about 1 to 10%, by weight, based on the weight of the polyether polyol.
Claim 14
Dependent Claim
18 words
The foam of claim 10 wherein the diisocyanate is a mixture of distilled isomeric 2,4 and 2,6-tolylene diisocyanates.
Claim 15
Dependent Claim
28 words
The foam of claim 12 wherein the polyether polyol is a polyethylene ether triol or diol or mixture thereof having a number average molecular weight between about 4,500-6,700.
Claim 16
Dependent Claim
17 words
The foam of claim 12 wherein the isocyanurate polyol employed as curing agent corresponds to the formula
Claim 17
Dependent Claim
22 words
The foam of claim 14 wherein, in said formula, x is 1 to 5 and y and z are 0 to 5.
Claim 18
Dependent Claim
21 words
The foam of claim 14 wherein, in said formula, R is methyl and each of x, y and z is 1.
Claim 19
Dependent Claim
21 words
The foam of claim 14 wherein, in said formula, R is hydrogen and each of x, y and z is 1.
References Cited (Backward Citations)
CA894240A
Cited
US3174950A
Cited
US3377296A
Cited
US3523918A
Cited
US3467606A
Cited
US3595814A
Cited
US3586649A
Cited
US3632707A
Cited
US3730923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |