Formaldehyde immobilization method

Details Formaldehyde immobilization method Formaldehyde immobilization method

1982-09-13

1984-12-25

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

52743, 521187, 521188, C08J 936, C08J 940

Patent

active

044904860

ABSTRACT:
Residual formaldehyde contained in urea formaldehyde structures is immobilized by subjecting the structure to a gaseous mixture of a carrier/penetrating gas and a reactive gas chosen from the group consisting of anhydrous ammonia, ozone and mixtures thereof for a period sufficient to react with and immobilize the formaldehyde. In building construction utilizing urea formaldehyde foamed in place insulation the method comprises the steps of injecting the gaseous mixture of the carrier/penetrating gas with anhydrous ammonia, ozone or a mixture of anhydrous ammonia and ozone into the stud space containing the foamed in place urea formaldehyde insulation. For structures in which particle board or similar manufactured sheet material contains residual formaldehyde the formaldehyde may be reacted by exposure of the surface of the panel to anhydrous ammonia, ozone or mixtures thereof contained in the carrier/penetrating gas.

REFERENCES:
patent: 3189479 (1965-06-01), Coppick et al.
patent: 3284379 (1966-11-01), Brasco et al.
patent: 3290260 (1966-12-01), Buccigross
patent: 3312639 (1967-04-01), Justice
patent: 3855161 (1974-12-01), Bauer
patent: 4119757 (1978-10-01), Hobson et al.

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