Process for the manufacture of urea-formaldehyde resins

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From aldehyde or derivative thereof as reactant

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528260, 524405, 524597, 525509, 428106, C08G 1212, C08K 338, B32B 2742

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050345001

ABSTRACT:
Urea-formaldehyde resins, particularly useful for producing particle boards having lower rates of release of formaldehyde are synthesized in several stages including a stage of further condensing a first condensate having a F/U molar ratio of 1.8-2.3 and which was condensed at a pH of between 6 and 8. The further condensing is conducted at a pH of between 6 and 8 until a cloud point with water is reached at 10.degree.-40.degree. C. making it possible to obtain resins which are reactive and stable during storage.

REFERENCES:
patent: 2428752 (1947-10-01), Hewett
patent: 3896087 (1975-07-01), Brunnmueller et al.
patent: 4482699 (1984-11-01), Williams
Japan Appln. Abstract 58-147478(A), vol. 7, No. 263 (C-196) (1408), Nov. 24, 1983.

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