Process for the preparation of urea-formaldehyde resins

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

1982-02-16

1983-04-26

Phynes, Lucille M.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

528232, 528259, C08L 6120

Patent

active

043813682

ABSTRACT:
A process for preparing urea-formaldehyde resins is disclosed. The process involves reacting urea and formaldehyde at pH 4.5-5.5 at 90.degree. to 100.degree. C. at a mole ratio of 2.0:1 to 2.2:1 formaldehyde:urea, and adding additional urea under these conditions. The reaction mixture is then neutralized and cooled to 30.degree. to 50.degree. C.and additional urea is reacted. The reaction mixture is then cooled to from 40.degree. to 30.degree. C. and additional formaldehyde and urea added to bring the final mole ratio of formaldehyde:urea to from 1.05:1 to 1.15:1.

REFERENCES:
patent: 2729611 (1956-01-01), Chesley
patent: 3842039 (1974-10-01), Vargiu et al.
patent: 3896087 (1975-07-01), Brunnmueller et al.
patent: 3962166 (1976-06-01), Gordon
patent: 4174310 (1979-11-01), Hubbard
patent: 4246152 (1981-01-01), Bruguera
patent: 4247433 (1981-01-01), Schamberg et al.

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