Patent US4638016A successfully refreshed from Google Patents.
US4638016A
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US
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Process for producing high density elastic polyurethane using a combination of 4-methyl-1-(2-dimethylaminoethyl) piperazine together with another tertiary amine catalyst
Assignee: Tosoh Corp
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Filing: 1985-08-21
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Granted: 1987-01-20
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Expires: 2005-08-21
Abstract
Abstract Process for producing a high density elastic polyurethane of reduced weight having excellent resistance to bending, which employs as catalyst 4-methyl-1-(2-dimethylaminoethyl)piperazine or a mixture of 4-methyl-1-(2-dimethylaminoethyl)piperazine and another tertiary amine compound as co-catalyst.
Inventors
- 👤 Shoji Arai
- 👤 Yutaka Tamano
- 👤 Masazumi Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:38
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/20; C08G18/2009; C08G18/2027; C08G18/28; C08G18/40; C08G18/42; C08G18/4236; C08G18/4238; C08G2410/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
81 words
Process for producing a high density elastic polyurethane of reduced weight which comprises a polyol having a molecular weight of 500-4,000, a cross linking agent, a blowing agent, an organic polyisocyanate which is a terminal isocyanate prepolymer which is the reaction product of polyisocyanate and/or of a mixture of polyisocyanate and a compound containing two or more active hydrogen atoms in the molecule, comprising employing as catalyst 4-methyl-1-(2-dimethylaminoethyl) piperazine or a mixture of 4-methyl-1-(2-dimethylaminoethyl)piperazine and another tertiary amine compound as co-catalyst.
Claim 2
Dependent Claim
81 words
Process for producing a high density elastic polyurethane of reduced weight which comprises a polyol having a molecular weight of 500-4,000, a cross linking agent, a blowing agent, an organic polyisocyanate which is a terminal isocyanate prepolymer which is the reaction product of polyisocyanate and/or of a mixture of polyisocyanate and a compound containing two or more active hydrogen atoms in the molecule, comprising employing as catalyst 4-methyl-1-(2-dimethylaminoethyl) piperazine or a mixture of 4-methyl-1-(2-dimethylaminoethyl)piperazine and another tertiary amine compound as co-catalyst.
Claim 3
Dependent Claim
10 words
Process according to claim 1, wherein polyol is polyester polyol.
Claim 4
Dependent Claim
20 words
Process according to claim 2, wherein said polyester polyol is polyester diol which is prepared from adipic acid and diol.
Claim 5
Dependent Claim
13 words
Process according to claim 1, wherein said other tertiary amine compound is triethylenediamine.
Claim 6
Dependent Claim
32 words
Process according to any one of claims 1 through 4, wherein employed is a mixture of 20-95% by weight of 4-methyl-1-(2-dimethylaminoethyl)piperazine as catalyst and 5-80% by weight of triethylene diamine as co-catalyst.
Claim 7
Dependent Claim
22 words
Process according to any of claims 1 through 5, wherein said high density elastic polyurethane is an elastomer for use as sole.
Claim 8
Dependent Claim
47 words
A process according to claim 6 wherein there is employed a mixture of 20-95% by weight of 4-methyl-1-(2-dimethhlaminoethyl) piperazine as catalyst and 5-80% by weight of triethylene diamine as cocatalyst and the polyol is a polyester diol which has been prepared from adipic acid and a diol.
Claim 9
Dependent Claim
23 words
A process according to claim 5 wherein the polyol is a polyester diol which has been prepared from adipic acid and a diol.
References Cited (Backward Citations)
US2949431A
Cited
GB1365015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |