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US4297442A
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Cellular elastomeric foams and method of production using an expanding agent containing a component reactive with the polyamine chain-lengthening agent
Assignee: Metzeler Kautschuk GmbH
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Filing: 1980-06-27
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Granted: 1981-10-27
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Expires: 2000-06-27
Abstract
Abstract Polyurethane elastomeric foam by foaming a prepolymer or polyisocyanates and compounds having at least two hydrogen atoms reactive to isocyanates, and a chain-lengthening polyamine agent, in the presence of an expanding agent containing a component reactive with the polyamine chain-lengthening agent or with the products of reaction thereof with polyisocyanates, and split-off gas.
Inventors
- 👤 Johannes Blahak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:46
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
51 words
Cellular elastomeric foams produced by foaming a polyurethane or a polyurethane prepolymer and cross-linked with a polyamine-chain lengthening agent in the presence of an organic expanding agent containing at least in part a gas-forming component, which reacts with the polyamine chain-lengthening agent or with the products of reaction thereof with polyisocyanates.
Claim 2
Dependent Claim
51 words
Cellular elastomeric foams produced by foaming a polyurethane or a polyurethane prepolymer and cross-linked with a polyamine-chain lengthening agent in the presence of an organic expanding agent containing at least in part a gas-forming component, which reacts with the polyamine chain-lengthening agent or with the products of reaction thereof with polyisocyanates.
Claim 3
Dependent Claim
54 words
Method for the production of cellular elastomeric foams by foaming a polyurethane or a polyurethane prepolymer cross-linked with a polyamine-chain lengthening agent in the presence of an organic expanding agent containing at least in part a gas-forming component, which reacts with the polyamine chain-lengthening agent or with the products of reaction thereof with polyisocyanates.
Claim 4
Dependent Claim
54 words
Method for the production of cellular elastomeric foams by foaming a polyurethane or a polyurethane prepolymer cross-linked with a polyamine-chain lengthening agent in the presence of an organic expanding agent containing at least in part a gas-forming component, which reacts with the polyamine chain-lengthening agent or with the products of reaction thereof with polyisocyanates.
Claim 5
Dependent Claim
14 words
Method according to claim 2, wherein the polyamine chain-lengthening agent is bisethoxylated toluylene diamine.
Claim 6
Dependent Claim
16 words
Method according to claim 2, wherein the polyamine chain-lengthening agent is a 4-methyl 3, diamino-benzoic-acid ester.
Claim 7
Dependent Claim
22 words
Method according to claim 2, wherein the polyamine chain-lengthening agent is a mixed condensate of 2,6-diethyl and 2,6 diisopropyl aniline with formaldehyde.
Claim 8
Dependent Claim
32 words
Method according to claim 2, wherein the polyamine chain-lengthening agent with the prepolymer alone at 55° C. has a reaction time of <30 seconds and a mold removal time of <3 minutes.
Claim 9
Dependent Claim
20 words
Method according to claim 6, wherein the reaction time is <20 seconds and the mold removal time is <2 minutes.
Claim 10
Dependent Claim
15 words
Method according to claim 2, wherein the gas-forming component is a dicarbonic acid dialkyl ester.
Claim 11
Dependent Claim
15 words
Method according to claim 8, wherein the gas-forming component is a dicarbonic acid diethyl ester.
Claim 12
Dependent Claim
17 words
Method according to claim 2, wherein the gas-forming component is isatoic acid anhydride suspended in the prepolymer.
Claim 13
Dependent Claim
19 words
Method according to claim 2, wherein the gas-forming component is formic acid or an aqueous solution of formic acid.
Claim 14
Dependent Claim
11 words
Method according to claim 2, wherein the gas-forming component is carbaminate.
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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |