Patent US1362367A successfully refreshed from Google Patents.
US5118722A
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Method of producing elastic foams having a base of polyurethane by microwave foaming
Assignee: Illbruck GmbH
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Filing: 1989-11-27
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Granted: 1992-06-02
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Expires: 2009-11-27
Abstract
Abstract A method of producing elastic foam having a base of polyurethane, in particular for use in the field of automobiles for sound damping. Allows production of foam parts directly in a desired shape in as few operations as possible. The foam is formed from a mixture of at least one polyurethane precondensate, at least on melamine precondensate and further additives for the foaming.
Inventors
- 👤 Klaus Wollmann
- 👤 Alexander Ach
- 👤 Werner Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:13
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2361/00; C08J2361/20; C08J2361/26; C08J2361/28; C08J2375/00; C08J2375/04; C08J2461/00; C08J2475/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
66 words
A method of producing elastic foam having a base of polyurethane suitable for use in automobiles for acoustic insulation, by foaming a polyisocyanate and a polyalcohol under dielectric heating, the method comprising mixing at least one polyurethane precondensate, at least one water-insoluble melamine formaldehyde precondensate, a protein/fatty-acid concentrate which acts as foaming agent and emulsifier, and further additives to produce a mixture; and foaming the mixture.
Claim 2
Independent Claim
66 words
A method of producing elastic foam having a base of polyurethane suitable for use in automobiles for acoustic insulation, by foaming a polyisocyanate and a polyalcohol under dielectric heating, the method comprising mixing at least one polyurethane precondensate, at least one water-insoluble melamine formaldehyde precondensate, a protein/fatty-acid concentrate which acts as foaming agent and emulsifier, and further additives to produce a mixture; and foaming the mixture.
Claim 3
Dependent Claim
22 words
A method according to claim 1, wherein said polymethane precondensate is a linear polyurethane precondensate having 5 to 10% free isocyanate groups.
Claim 4
Dependent Claim
22 words
A method according to claim 2, wherein the mixing step employs also linear polyisocyanate precondensates having 5 to 10% free isocyanate groups.
Claim 5
Dependent Claim
22 words
A method according to claim 1, wherein the mixing step employs also linear polyisocyanate precondensates having 5 to 10% free isocyanate groups.
Claim 6
Dependent Claim
38 words
A method according to claim 1, wherein the mixing step employs a polyurethane precondensate which has been obtained from a polyhydroxy compound having a molecular weight of 1000 to 3000 and a hydroxyl number of 30 to 70.
Claim 7
Dependent Claim
27 words
A method according to claim 4, wherein as polyisocyanate there is used 2,4- and 2,6-toluylene-diisocyanate, naphthaline-1,5-diisocyanate, diphenylmethane-4,4'-diisocyanate, 1,6-hexamethylene diisocyanate, trimethylhexamethylene diisocyanate or isophorondiisocyanate, individually or in mixture.
Claim 8
Dependent Claim
17 words
A method according to claim 6, wherein a polyester or polyether glycol is used as polyhydroxy compound.
Claim 9
Dependent Claim
17 words
A method according to claim 5, wherein a polyester or polyether glycol is used as polyhydroxy compound.
Claim 10
Dependent Claim
21 words
A method according to claim 1, wherein the foaming is effected for about 1 to 20 minutes in a microwave oven.
Claim 11
Dependent Claim
28 words
A method according to claim 1, further comprising a step of subsequent hardening of the mixture for about 1 to 10 minutes at 50° C. to 100° C.
Claim 12
Dependent Claim
23 words
An elastic foam comprising a foamed mixture of at least one polyurethane precondensate, at least one water-insoluble melamine formaldehyde precondensate, and further additives.
Claim 13
Dependent Claim
23 words
An elastic foam comprising a foamed mixture of at least one polyurethane precondensate, at least one water-insoluble melamine formaldehyde precondensate, and further additives.
Claim 14
Dependent Claim
13 words
A foam according to claim 11, wherein said further additives comprise an emulsifier.
Claim 15
Dependent Claim
13 words
A foam according to claim 11, wherein said further additives comprise a stabilizer.
Claim 16
Dependent Claim
14 words
A foam according to claim 13, wherein said further additives comprise an expansion agent.
Claim 17
Dependent Claim
40 words
A sound-damping composite structural part, suitable for use in an automobile, comprising a foamed mixture of at least one polyurethane precondensate, at least one water-insoluble melamine formaldehyde precondensate, and further additives; and a plastic supporting part for supporting the foam.
Claim 18
Dependent Claim
40 words
A sound-damping composite structural part, suitable for use in an automobile, comprising a foamed mixture of at least one polyurethane precondensate, at least one water-insoluble melamine formaldehyde precondensate, and further additives; and a plastic supporting part for supporting the foam.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-02 | 1995-12-02 | 1996-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-02 | 1999-12-02 | 2000-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-02 | 2003-12-02 | 2004-06-02 | $7700.00 | Window Closed / Lapsed |