Patent US3880780A successfully refreshed from Google Patents.
US3880780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High resilient polyurethane foam
Assignee: Olin Corp
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Filing: 1974-09-23
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Granted: 1975-04-29
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Expires: 1994-09-23
Abstract
Abstract Flexible polyurethane foam having a combination of desirable physical properties is prepared from a select formulation comprising an oxypropylated, oxyethylated triol, a select polyisocyanate mixture, and an aromatic amine curing agent. The resulting foam is of utility in various cushioning applications including the production of automotive seats.
Inventors
- 👤 Williard L Ridenour
- 👤 Robert D Mcaree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:55
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7607; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6685; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/005; C08G2110/0058; C08G2110/0083; Y; Y10; Y10S; Y10S521/00; Y10S521/904
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
115 words
A FLEXIBLE ONE SHOT POLYURETHANE FOAM PREPARED FROM A REACTION MIXTURE COMPRISED OF: A. A POLYETHER TRIOL HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 4,400 AND AT LEAST 60 PERCENT OF PRIMARY HYDROXYL GROUPS WHICH IS THE PRODUCT OF SEQUENTIALLY OXYALKYLATING A TRIHYDROXY ALCOHOL FIRST WITH PROPYLENE OXIDE AND THEN EITH ETHYLENE OXIDE, B. A POLYISOCYANATE MIXTURE OF (1) TOLUENE DIISOCYANATE AND (2) A POLYMETHYLENE POLYPHENYLISOCYANATE IN A WEIGHT RATIO, (1):(2), FROM ABOUT 75:25 TO ABOUT 96:4, IN AN AMOUNT SUFFICIENT TO PROVIDE FROM 0.7 TO ABOUT 1.25 NCO GROUPS PER EACH HYDROXYL GROUP IN THE REACTION MIXTURE, C. A BLOWING AGENT, D. A REACTION CATALYST, AND E. AN AROMATIC PRIMARY DIAMINE CURING AGENT.
Claim 2
Dependent Claim
115 words
A FLEXIBLE ONE SHOT POLYURETHANE FOAM PREPARED FROM A REACTION MIXTURE COMPRISED OF: A. A POLYETHER TRIOL HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 4,400 AND AT LEAST 60 PERCENT OF PRIMARY HYDROXYL GROUPS WHICH IS THE PRODUCT OF SEQUENTIALLY OXYALKYLATING A TRIHYDROXY ALCOHOL FIRST WITH PROPYLENE OXIDE AND THEN EITH ETHYLENE OXIDE, B. A POLYISOCYANATE MIXTURE OF (1) TOLUENE DIISOCYANATE AND (2) A POLYMETHYLENE POLYPHENYLISOCYANATE IN A WEIGHT RATIO, (1):(2), FROM ABOUT 75:25 TO ABOUT 96:4, IN AN AMOUNT SUFFICIENT TO PROVIDE FROM 0.7 TO ABOUT 1.25 NCO GROUPS PER EACH HYDROXYL GROUP IN THE REACTION MIXTURE, C. A BLOWING AGENT, D. A REACTION CATALYST, AND E. AN AROMATIC PRIMARY DIAMINE CURING AGENT.
Claim 3
Dependent Claim
20 words
A polyurethane foam as claimed in claim 1 wherein said polyether triol contains about 65-85 percent of primary hydroxyl groups.
Claim 4
Dependent Claim
34 words
The polyurethane foam of claim 2 wherein said polyether triol has a molecular weight from about 4,500 to about 7,000 and said ratio in the polyisocyanate mixture is from about 85:15 to about 94:6.
Claim 5
Dependent Claim
39 words
The polyurethane foam of claim 3 wherein said curing agent is a methylene-bridged aromatic diamine and this is employed in a proportion ranging from about 1 to about 4 parts per 100 parts by weight of saId polyether triol.
Claim 6
Dependent Claim
14 words
The polyurethane foam of claim 4 wherein said trifunctional alcohol is glycerin or trimethylolpropane.
Claim 7
Dependent Claim
28 words
The polyurethane foam of claim 5 wherein said curing agent is used in a proportion of about 1.6-2.4 parts per 100 parts by weight of said polyether triol.
Claim 8
Dependent Claim
20 words
The polyurethane foam of claim 6 wherein said ratio in the polyisocyanate mixture ranges from about 87:13 to about 92:8.
Claim 9
Dependent Claim
13 words
The polyurethane foam of claim 7 wherein said catalyst comprises a tertiary amine.
Claim 10
Dependent Claim
15 words
The polyurethane foam of claim 8 wherein said reaction mixture comprises a polyurethane foam surfactant.
Claim 11
Dependent Claim
16 words
The polyurethane foam of claim 9 wherein said ratio in the polyisocyanate mixture is about 90:10.
Claim 12
Dependent Claim
12 words
The polyurethane foam of claim 10 wherein said foaming agent is water.
Claim 13
Dependent Claim
32 words
The polyurethane foam of claim 11 wherein said trifunctional alcohol is glycerin and said polyether triol contains about 70 percent of primary hydroxyl groups and has a molecular weight of about 6,000.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |