Patent US4701473A successfully refreshed from Google Patents.
US4701473A
Expired / Lapsed
US
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Catalyst for producing polyurethane foams coated with skin
Assignee: Tosoh Corp
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Filing: 1986-06-23
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Granted: 1987-10-20
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Expires: 2006-06-23
Abstract
Abstract Amine catalysts useful for producing polyurethane foams coated with skin by reaction of an organic polyisocyanate with a polyol. The catalysts comprise 4-methyl-1-(2-hydroxyalkyl)-piperazine, and emit no bad odor, give excellent moldability and are free from deterioration of skin and discoloration of covering materials.
Inventors
- 👤 Masazumi Hasegawa
- 👤 Shoji Arai
- 👤 Shinya Mizoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:29
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/20; C08J; C08J9/00; C08J9/34; C08G18/2009; C08G18/2027; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
52 words
A process for producing a polyurethane foam coated with a skin comprising forming an unfoamed skin of a polyurethane elastomer or of a vinyl chloride resin in a mold and reacting an organic polyisocyanate with a polyol and foaming with a blowing agent in the presence of a 4-methyl-1-(2-hydroxyalkyl)piperazine in the mold.
Claim 2
Dependent Claim
52 words
A process for producing a polyurethane foam coated with a skin comprising forming an unfoamed skin of a polyurethane elastomer or of a vinyl chloride resin in a mold and reacting an organic polyisocyanate with a polyol and foaming with a blowing agent in the presence of a 4-methyl-1-(2-hydroxyalkyl)piperazine in the mold.
Claim 3
Dependent Claim
15 words
A process according to claim 1 wherein the skin is made from a polyurethane elastomer.
Claim 4
Dependent Claim
16 words
A process according to claim 1 wherein the skin is made from a vinyl chloride resin.
Claim 5
Dependent Claim
18 words
A process according to claim 1 wherein piperazine has 2 to 4 carbon atoms in the hydroxyalkyl group.
Claim 6
Dependent Claim
12 words
A process according to claim 4 wherein the hydroxyalkyl group is hydroxyethyl.
Claim 7
Dependent Claim
12 words
A process according to claim 4 wherein the hydroxyalkyl group is hydroxypropyl.
Claim 8
Dependent Claim
14 words
A process according to claim 1 comprising adding another tertiary amine as a promotor.
Claim 9
Dependent Claim
17 words
A process according to claim 7 wherein the promotor is triethylenediamine bis-(2-dimethyl-amino ethyl)ether or a mixture thereof.
Claim 10
Dependent Claim
29 words
A process according to claim 8 wherein the concentrations of 4-methyl-1-(2-hydroxyalkyl)piperazine and bis-(2-dimethylaminoethyl)ether are 98 to 50% and 1 to 50%, respectively, by weight based on the two materials.
Claim 11
Dependent Claim
36 words
A process according to claim 8 wherein there are employed 4-methyl-1-(2-hydroxyalkyl)piperazine, triethylenediamine and bis-(2-dimethylaminoethyl)ether in an amount of 98 to 67%, 1 to 8% and 1 to 25%, respectively, by weight based on these three materials.
Claim 12
Dependent Claim
30 words
A process according to claim 8 wherein the concentrations of 4-methyl-1-(2-hydroxyalkyl)piperazine and triethylenediamine are 98 to 85% and 2 l to 20% respectively, by weight based on these two materials.
Claim 13
Dependent Claim
13 words
A process according to claim 1 comprising including a solvent with the 4-methyl-1-(2-hydroxyalkyl)piperazine.
Claim 14
Dependent Claim
23 words
A process according to claim 12, wherein the solvent is selected from the group consisting of dipropylene glycol, ethylene glycol, 1,4-butanediol and water.
Claim 15
Dependent Claim
24 words
A process according to claim 13, wherein water is the solvent and the concentration of the piperazine is not more than 15% by weight.
References Cited (Backward Citations)
US4590223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |