US4016113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of Schiff bases as cross-linking agents for high resilience polyurethane foam
Assignee: Olin Corp
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Filing: 1976-02-17
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Granted: 1977-04-05
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Expires: 1996-02-17
Abstract
Abstract Selected Schiff bases of aromatic and alkylsubstituted aromatic ortho diamines are employed as cross-linking agents in the preparation of high resilience polyurethane foam.
Inventors
- 👤 Frank J. Preston
- 👤 John S. Babiec, Jr.
- 👤 Clifford J. Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:42
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6685; C08G18/30; C08G18/32; C08G18/3225; C08G18/3253; C08G18/3256; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/005; C08G2110/0083; Y; Y10; Y10S; Y10S521/00; Y10S521/904
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
147 words
In a process for preparing a flexible high resilience polyurethane foam from a reaction mixture comprised of an organic polyisocyanate, a foaming agent, a reaction catalyst, and a polyether polyol reactant characterized by (1) a molecular weight of at least about 4,000, (2) a polyhydroxy alcohol nucleus having a functionability of 2-4, (3) polyoxyalkylene chain segments attached to said nucleus and (4) a ratio of primary to secondary hydroxy groups ranging from about 1.5:1 to about 6:1, the improvement which comprises including in said reaction mixture a crosslinking amount of a Schiff base represented by the formula: ##STR9## wherein R is a hydrogen or alkyl or 1-12 carbon atoms, and each R' is independently an aliphatic hydrocarbon radical having 1-12 carbon atoms, or the moiety ##STR10## is an unsubstituted or alkyl-substituted cycloaliphatic radical having 5 or 6 ring carbon atoms, the alkyl substitutent having 1-6 carbon atoms.
Claim 2
Dependent Claim
147 words
In a process for preparing a flexible high resilience polyurethane foam from a reaction mixture comprised of an organic polyisocyanate, a foaming agent, a reaction catalyst, and a polyether polyol reactant characterized by (1) a molecular weight of at least about 4,000, (2) a polyhydroxy alcohol nucleus having a functionability of 2-4, (3) polyoxyalkylene chain segments attached to said nucleus and (4) a ratio of primary to secondary hydroxy groups ranging from about 1.5:1 to about 6:1, the improvement which comprises including in said reaction mixture a crosslinking amount of a Schiff base represented by the formula: ##STR9## wherein R is a hydrogen or alkyl or 1-12 carbon atoms, and each R' is independently an aliphatic hydrocarbon radical having 1-12 carbon atoms, or the moiety ##STR10## is an unsubstituted or alkyl-substituted cycloaliphatic radical having 5 or 6 ring carbon atoms, the alkyl substitutent having 1-6 carbon atoms.
Claim 3
Dependent Claim
10 words
A polyurethane foam prepared by the process of claim 1.
Claim 4
Dependent Claim
9 words
The process of claim 1 wherein R is methyl.
Claim 5
Dependent Claim
13 words
The process of claim 3 wherein the moiety ##STR11## is cyclopentyl or cyclohexyl.
Claim 6
Dependent Claim
10 words
A polyurethane foam prepared by the process of claim 4.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein said polyether polyol is a triol having a molecular weight of about 4500-7500.
Claim 8
Dependent Claim
14 words
The process of claim 6 wherein said reaction mixture also comprise a silicon-based surfactant.
Claim 9
Dependent Claim
20 words
The process of claim 7 wherein said organic polyisocyanate is toluene diisocyanate or a mixture thereof with a polymethylene polyphenylisocyanate.
Claim 10
Dependent Claim
14 words
The process of claim 8 wherein said catalyst comprises at least one tertiary amine.
Claim 11
Dependent Claim
10 words
A polyurethane foam prepared by the process of claim 9.
Claim 12
Dependent Claim
37 words
The process of claim 9 wherein said foaming agent is water and said polyether triol has a molecular weight of about 5600-6600 and ratio of primary to secondary hydroxy groups ranging from about 2:1 to about 5:1.
Claim 13
Dependent Claim
28 words
The process of claim 1 wherein said cross-linking agent is employed in a proportion of about 1-6 parts per every 100 parts by weight of said polyether triol.
Claim 14
Dependent Claim
15 words
The process of claim 12 wherein R is hydrogen or alkyl of 1-4 carbon atoms.
Claim 15
Dependent Claim
22 words
The process of claim 13 wherein said polyether polyol is an oxypropylated then oxyethylated glycerin and said organic polyisocyanate is toluene diisocyanate.
Claim 16
Dependent Claim
11 words
The process of claim 14 wherein said catalyst comprises stannous octoate.
Claim 17
Dependent Claim
15 words
The process of claim 15 wherein R is methyl and the moiety ##STR12## is cyclohexyl.
Claim 18
Dependent Claim
10 words
A polyurethane foam prepared by the process of claim 16.
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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |