Urea-formaldehyde resin manufacture

Details Urea-formaldehyde resin manufacture Urea-formaldehyde resin manufacture

1985-02-22

1986-01-14

Phynes, Lucille M.

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

Synthetic resins

From aldehyde or derivative thereof as reactant

525398, 525405, 525406, 528254, 528257, 528258, 528265, 528268, C08G 1234, C08G 1230

Patent

active

045646678

ABSTRACT:
A solid urea-formaldehyde resin is provided, having a degree of condensation of 25% to 45%.
A process for making the resin is also described and includes several steps. Urea and formaldehyde is first reacted with a molar ratio of U:F of 1:2.5 or more then concentrated. Further urea is added to reduce the ratio to the range 1:1.1 to 1:2 and further concentration is achieved without precipitation of solid resin by the use of a stabilization agent.

REFERENCES:
patent: 2413697 (1947-01-01), Edgar
patent: 3842039 (1974-10-01), Vargiu et al.
patent: 4064088 (1977-12-01), Reaser
patent: 4113701 (1978-09-01), Laqua et al.
patent: 4174310 (1979-11-01), Hubbard

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