Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From aldehyde or derivative thereof as reactant
Patent
1991-02-22
1992-06-09
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From aldehyde or derivative thereof as reactant
528239, 528254, 528259, C08G 1226
Patent
active
051208210
ABSTRACT:
A process of producing melamine formaldehyde resins using crude or impure melamine is described. The process using the impure or crude melamine includes the control of the pH within the range of from about 8 to 10, and preferably 9 to 9.2 during at least the initial stages of the formaldehyde/melamine reaction. The pH control provides resins having commercially acceptable characteristics, with the cook times of the resin formation also being commercially acceptable.
REFERENCES:
patent: 4645859 (1987-02-01), Green, II et al.
patent: 4663387 (1987-05-01), Lahalith et al.
patent: 4797433 (1989-01-01), Lahalith et al.
Crews George M.
Ji Shen
Acquah Sam A.
Kight III John
Melamine Chemicals, Inc.
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