US4246392A
Expired / Lapsed
US
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Method for the preparation of polyurethane elastomers based on polyethyleneglycol-bis(4-aminobenzoates)
Assignee: Ihara Chemical Industry Co Ltd
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Filing: 1978-10-11
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Granted: 1981-01-20
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Expires: 1998-10-11
Abstract
Abstract A method for the preparation of polyurethane elastomers in which polyethyleneglycol-bis(4-aminobenzoate) is used as the curing agent to be admixed with the polyurethane formulations. This curing agent imparts considerably extended pot life to the ready-prepared polyurethane composition to be cured by heating into an elastomer having improved properties.
Inventors
- 👤 Wataro Koike
- 👤 Masami Takayama
- 👤 Hideaki Ohashi
- 👤 Chihiro Yazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:48
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5024; C08G18/5027; C08G18/08; C08G18/10; C08G18/30; C08G18/32; C08G18/3225; C08G18/3237; C08G18/3243
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
46 words
A method for the preparation of a polyurethane elastomer which comprises admixing a polyethylene glycol-bis( 4-aminobenzoate) represented by the general formula ##STR2## wherein n is 2, 3 or 4, with a polyisocyanate and a polyol or with a prepolymer having isocyanate groups at the chain ends.
Claim 2
Independent Claim
46 words
A method for the preparation of a polyurethane elastomer which comprises admixing a polyethylene glycol-bis( 4-aminobenzoate) represented by the general formula ##STR2## wherein n is 2, 3 or 4, with a polyisocyanate and a polyol or with a prepolymer having isocyanate groups at the chain ends.
Claim 3
Dependent Claim
17 words
The method as claimed in claim 1 wherein the number n in the general formula is 2.
Claim 4
Dependent Claim
42 words
The method as claimed in claim 1 wherein the polyethylene glycol-bis(4-aminobenzoate) is admixed with the prepolymer having isocyanate groups at the chain ends in an amount in the range from 0.8 to 1.2 equivalents based on the isocyanate groups in the prepolymer.
Claim 5
Dependent Claim
29 words
The method as claimed in claim 1 wherein the polyethylene glycol-bis(4-aminobenzoate) is admixed while in a super-cooled liquid state with the prepolymer having isocyanate groups at the chain ends.
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) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |