Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1977-11-07
1978-05-30
Foelak, Morton
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 70R, 260 71, 260849, C08J 930, C08J 912
Patent
active
040922774
ABSTRACT:
Method of producing a substantially chemically stable urea-formaldehyde foam which comprises preparing a partially cured aqueous urea-formaldehyde resin, modifying the partially cured resin by reacting at pH 4.5 - 5.5 and 70.degree.-110.degree. C with aqueous dialdehyde containing two to six molecular carbons and additional urea with each additive amounting to 1-5 per cent by weight of the modified resin, neutralizing the modified resin to pH 6.7 - 7.5 by addition of aqueous alkali hydroxides or carbonates, combining said neutral modified resin with a froth produced by forcing air through a dilute acidic aqueous surfactant solution to re-activate and complete the cure of the modified resin in the foam, and drying the foam.
Glyoxal is the preferred dialdehyde for modifying the urea-formaldehyde foam resin because of its effectiveness at increasing chemical stability of the foam at levels as low as 1.0 per cent.
REFERENCES:
patent: 2559891 (1951-07-01), Meyer
patent: 3256067 (1966-06-01), Shriver et al.
patent: 3377139 (1968-04-01), MacGregor et al.
Foelak Morton
Waverly Chemical Co.
LandOfFree
Method for producing chemically stable urea-formaldehyde foams does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for producing chemically stable urea-formaldehyde foams, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for producing chemically stable urea-formaldehyde foams will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-468660