Process for the preparation of thermosettable urea-formaldehyde

Details Process for the preparation of thermosettable urea-formaldehyde Process for the preparation of thermosettable urea-formaldehyde

1979-05-24

1981-01-27

Pertilla, Theodore E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

428530, 528259, C08L 6124, C08G 1212

Patent

active

042474337

ABSTRACT:
A method for preparing thermosettable urea-formaldehyde resins having a urea to formaldehyde molar ratio of 1:1 to 1:1.5 wherein urea and formaldehyde are first reacted in an aqueous solution at a molar ratio of 1:1.5 to 1:4 in the pH range between 7.5 to 10, and then condensing the reactants in a pH range from 4 to 6 to a precipitation number of 1:1.5 to 1:10, thereafter adjusting the pH to 7 to 10 and adding the remaining urea to obtain a molar ratio of 1:1 to 1:1.5 and continuing the reaction until a precipitation number of 1:0.5 to 1:3 is obtained. The products obtained have a uniform molecular weight and good penetration properties when used to impregnate supporting webs for coating wood-based panels.

REFERENCES:
patent: 2729611 (1956-01-01), Chesley et al.
patent: 3198761 (1965-08-01), O'Donnell
patent: 3842039 (1974-10-01), Vargiu et al.
patent: 4113701 (1978-09-01), Laqua et al.

Affiliated with

Also associated with

Rating

Process for the preparation of thermosettable urea-formaldehyde does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the preparation of thermosettable urea-formaldehyde , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of thermosettable urea-formaldehyde will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1180795