US4666948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of resilient melamine foams
Assignee: BASF SE
•
Filing: 1986-09-24
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Granted: 1987-05-19
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Expires: 2006-09-24
Abstract
Abstract Resilient foams based on melamine resins are prepared by foaming an aqueous solution which contains a melamine/formaldehyde precondensate, an emulsifier, a volatile blowing agent and a curing agent and then curing the foam. In this process, from 0.2 to 4% by weight of an alkali metal, alkaline earth metal or aluminum salt of an organic, preferably polybasic acid, of a polyphosphoric acid or of a boron acid are added to the aqueous solution.
Inventors
- 👤 Frank P. Woerner
- 👤 Peter Neumann
- 👤 Harald Mahnke
- 👤 Josef Lamprecht
- 👤 Dieter Horn
- 👤 Gerhard Turznik
- 👤 Friedrich Kraus
- 👤 Hanshelmut Kaeppel
- 👤 Eduard Heim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:09
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/141; C08J9/0014; C08J9/0023; C08J9/0066; C08J2361/00; C08J2361/20; C08J2361/26; C08J2361/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
84 words
A process for the preparation of a resilient foam based on a melamine resin by foaming an aqueous solution which contains a melamine/formaldehyde precondensate, an emulsifier, a volatile blowing agent and a curing agent and, if required, conventional additives, and then curing the foam, wherein from 0.2 to 4% by weight, based on the precondensate, of an alkali metal, alkaline earth metal or aluminum salt of an organic acid, of a polyphosphoric acid or of a boron acid are added to the aqueous solution.
Claim 2
Dependent Claim
84 words
A process for the preparation of a resilient foam based on a melamine resin by foaming an aqueous solution which contains a melamine/formaldehyde precondensate, an emulsifier, a volatile blowing agent and a curing agent and, if required, conventional additives, and then curing the foam, wherein from 0.2 to 4% by weight, based on the precondensate, of an alkali metal, alkaline earth metal or aluminum salt of an organic acid, of a polyphosphoric acid or of a boron acid are added to the aqueous solution.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1, wherein a salt A of a polybasic acid, preferably of a polymeric acid, is used.
Claim 4
Dependent Claim
70 words
A process as claimed in claim 2, wherein a combination of a salt A of a polybasic acid with an alkali metal or alkaline earth metal salt B of an organic acid or of an oxyacid of sulfur, of phosphorus or of boron, the acid of salt B having a lower basicity than the acid of salt A, is used in a weight ratio A:B of from 10:90 to 50:50.
Claim 5
Dependent Claim
50 words
A process as claimed in claim 3, wherein a combination of from 0.1 to 1% by weight of an alkali metal salt of a polymeric acid with from 0.5 to 2.5% by weight of an alkali metal salt of formic acid is used, the percentages being based on the precondensate.
References Cited (Backward Citations)
US3238155A
Cited
US4192923A
Cited
US4390643A
Cited
EP0017671A1
Cited
US4511678A
Cited
US4540717A
Cited
US4336170A
Cited
EP0037470A1
Cited
US4334971A
Cited
EP0053441A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |