Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1981-05-22
1983-01-04
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521 82, 521136, 521137, 528 85, C08G 1814
Patent
active
043672949
ABSTRACT:
A process for the preparation of polyurethane foams modified with melamine-formaldehyde precondensates, in which the precondensates employed are storage-stable, aqueous 40-85% strength by weight resin solutions which are obtained by condensing melamine with formaldehyde in a molar ratio of 1:1.1-1.75 in aqueous solution at a pH which, at least periodically, is above 8, and at from 60 to 130.degree. C., until one part by volume of resin solution can be diluted with from 0.5 to 4 parts by volume of water at 20.degree. C. without causing a persisting cloudiness.
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Hahn Klaus
Horn Peter
Marx Matthias
Weber Heinz
Weiss Wolfram
BASF - Aktiengesellschaft
Foelak Morton
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