Patent US4666948A successfully refreshed from Google Patents.
US4666948A
Expired / Lapsed
US
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Preparation of resilient melamine foams
Assignee: BASF SE
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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 20:23
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.
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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) | 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 |