US3933701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High resilience polyurethane foam
Assignee: Olin Corp
•
Filing: 1975-01-29
•
Granted: 1976-01-20
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Expires: 1995-01-29
Abstract
Abstract Selected methylene-bridged diaryl polyisocyanates are used as stabilizers in the production of high resilience polyurethane foam.
Inventors
- 👤 John E. Puig
- 👤 Ralph A. Colafati, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:02
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G18/7671; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; Y; Y10; Y10S; Y10S521/00; Y10S521/904
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
137 words
In a process for preparing polyurethane foam from a reaction mixture comprised of an organic polyisocyanate, a polyether polyol reactant characterized by (1) a molecular weight of at least about 4,000, (2) an aliphatic alcohol nucleus having from about 2 to about 8 hydroxyl groups, (3) polyoxyalkylene chain segments attached to said nucleus, and (4) a ratio of primary to secondary hydroxyl end groups ranging from about 1.5:1 to about 5.5:1, a foaming agent and a reaction catalyst, the improvement which comprises including in said reaction mixture a foam stabilizing proportion of a methylene-bridged diaryl polyisocyanate of the formula: ##EQU4## wherein R 1 is NCO or halogen, and R 2 is H or an alkyl having 1-4 carbon atoms, with the proviso that when R 1 is halogen, R 2 is an alkyl having 1-4 carbon atoms.
Claim 2
Dependent Claim
137 words
In a process for preparing polyurethane foam from a reaction mixture comprised of an organic polyisocyanate, a polyether polyol reactant characterized by (1) a molecular weight of at least about 4,000, (2) an aliphatic alcohol nucleus having from about 2 to about 8 hydroxyl groups, (3) polyoxyalkylene chain segments attached to said nucleus, and (4) a ratio of primary to secondary hydroxyl end groups ranging from about 1.5:1 to about 5.5:1, a foaming agent and a reaction catalyst, the improvement which comprises including in said reaction mixture a foam stabilizing proportion of a methylene-bridged diaryl polyisocyanate of the formula: ##EQU4## wherein R 1 is NCO or halogen, and R 2 is H or an alkyl having 1-4 carbon atoms, with the proviso that when R 1 is halogen, R 2 is an alkyl having 1-4 carbon atoms.
Claim 3
Dependent Claim
10 words
A polyurethane foam prepared by the process of claim 1.
Claim 4
Dependent Claim
39 words
The process of claim 1 wherein said polyether polyol has a molecular weight of from about 4,500 to about 7,000 and in which said ratio of primary to secondary hydroxyl end groups ranges from about 2:1 to about 5:1.
Claim 5
Dependent Claim
12 words
The process of claim 3 wherein said organic polyisocyanate is toluene diisocyanate.
Claim 6
Dependent Claim
39 words
The process of claim 4 wherein said methylene-bridged diaryl polyisocyanate is an isomeric mixture selected from the group consisting of a mixture of 2,4- and 2,6-diisocyanatophenyl-isocyanatophenyl-methane, a mixture of 2,4- and 2,6-diisocyanatophenyl-chloromethylphenyl-methane, and a mixture of 2,4- and 2,6-diisocyanatophenyl-chloroethylphenyl-methane.
Claim 7
Dependent Claim
27 words
The process of claim 5 wherein said foam stabilizing proportion ranges from about 1 to about 5 parts per 100 parts by weight of said polyether polyol.
Claim 8
Dependent Claim
10 words
A polyurethane foam prepared by the process of claim 6.
Claim 9
Dependent Claim
61 words
The process of claim 1 wherein said methylene-bridged diaryl polyisocyanate is represented by one of the following two formulas or a mixture thereof: ##EQU5## wherein, as applied to each of said formulas, R 1 is NCO or chlorine and R 2 is H, methyl or ethyl with the proviso that when R 1 is chlorine, R 2 is ethyl or methyl.
Claim 10
Dependent Claim
10 words
A polyurethane foam prepared by the process of claim 8.
Claim 11
Dependent Claim
38 words
The process of claim 8 wherein said methylene-bridged diaryl polyisocyanate is an isomeric mixture selected from the group consisting of a mixture of 2,4- and 2,6-diisocyanatophenyl-isocyanatophenyl-methane, a mixture of 2,4- and 2,6-diisocyanatophenyl-chloromethylphenyl-methane, a mixture of 2,4- and 2,6-diisocyanatophenyl-chloroethylphenyl-methane.
Claim 12
Dependent Claim
45 words
The process of claim 9 wherein said polyether polyol is an oxypropylated, oxyethylated aliphatic triol having a molecular weight of from about 4,500 to about 6,600 and in which said ratio of primary to secondary hydroxyl end groups ranges from about 3:1 to about 4.5:1.
Claim 13
Dependent Claim
36 words
The process of claim 10 wherein said organic polyisocyanate is an isomeric mixture of 2,4- and 2,6-toluene diisocyanate in which the weight ratio of the 2,4-isomer to the 2,6-isomer is from about 60:40 to about 90:10.
Claim 14
Dependent Claim
13 words
The process of claim 12 wherein said aliphatic triol is glycerol or trimethylolpropane.
Claim 15
Dependent Claim
37 words
The process of claim 13 wherein said reaction catalyst is a mixture of triethylene diamine and dipropylene glycol having a weight ratio of from about 1:2 to about 1:4 of said triethylene diamine to said dipropylene glycol.
Claim 16
Dependent Claim
10 words
A polyurethane foam produced by the process of claim 11.
Claim 17
Dependent Claim
18 words
The process of claim 14 wherein said methylene-bridged diaryl polyisocyanate is an isomeric mixture of 2,4- and 2,6-diisocyanatophenyl-isocyanatophenyl-methane.
Claim 18
Dependent Claim
24 words
A polyurethane foam produced by the process of claim 16 having a density of from about 1.3 to about 3.8 pounds per cubic foot.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |