Invention Grant
- Patent Title: Method for producing melamine/formaldehyde foams
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Application No.: US14425357Application Date: 2013-08-23
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Publication No.: US09663625B2Publication Date: 2017-05-30
- Inventor: Bernd Gross , Horst Baumgartl , Jens-Uwe Schierholz , Bettina Wester , Peter Wolf , Bernhard Vath , Peter Nessel , Klaus Hahn , Tobias Heinz Steinke
- Applicant: BASF SE
- Applicant Address: DE Ludwigshafen
- Assignee: BASF SE
- Current Assignee: BASF SE
- Current Assignee Address: DE Ludwigshafen
- Agency: Drinker, Biddle & Reath LLP
- Priority: EP12182963 20120904
- International Application: PCT/EP2013/067525 WO 20130823
- International Announcement: WO2014/037233 WO 20140313
- Main IPC: C08J9/00
- IPC: C08J9/00 ; B29C44/20 ; C08L61/28 ; C08J9/14 ; C08J9/30 ; B29K81/00 ; B29L31/00

Abstract:
The present invention relates to processes for producing melamine-formaldehyde foams, said processes comprising the steps of: a) producing an aqueous mixture M1) comprising 100 parts by weight of at least one melamine-formaldehyde precondensate, 2 to 4 parts by weight of at least one curative, 0.2 to 5 parts by weight of a surfactant mixture, 0.1 to 5 parts by weight of at least one salt of an inorganic acid or one salt of an organic carboxylic acid, 1 to 40 parts by weight of at least one blowing agent, 0 to 5 parts by weight of at least one dye and/or optical brightener, 0 to 20 parts by weight of one or more further additives, and 25 to 60 parts by weight of water, b) heating and foaming said mixture M1) using microwave radiation, c) crosslinking and curing the resulting foam using the curative and microwave radiation, d) drying the foam using microwave radiation, and e) annealing the dried foam using hot air, wherein as essential feature of the present invention said mixture M1) comprises a surfactant mixture comprising a mixture of 50 to 90 wt % of an anionic surfactant and 10 to 50 wt % of a nonionic surfactant, wherein the weight percentages are each based on the total weight of the surfactant mixture, and also to melamine-formaldehyde foams obtainable by the processes of the present invention and also to uses of said foams.
Public/Granted literature
- US20150210814A1 METHOD FOR PRODUCING MELAMINE/FORMALDEHYDE FOAMS Public/Granted day:2015-07-30
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