Formaldehyde → Melamine formaldehyde

In 120 parts of a 4.5% aqueous solution of partial sodium salt of polyvinylbenzene sulfonic acid (average molecular weight: 500,000) adjusted to pH 6.0 were dispersed 2 parts of 2-(2'-hydroxy-3',5'-di-tertbutylphenyl)-5-chlorobenzotriazole as an ultraviolet absorber and 100 parts of a color former oil prepared by dissolving a color former shown in Table 1 in a solvent shown in Table 1 to thereby obtain an emulsion having such a particle size that the average particle diameter was 5.5 μm. Independently, 6 parts of melamine, 11 parts of a 37% by weight aqueous formaldehyde solution and 30 parts of water were heated at 60° C. and stirred, and in 30 minutes a transparent aqueous solution of a mixture of melamine, formaldehyde and a melamine-formaldehyde initial condensate was obtained. The pH of the aqueous solution of the mixture was 6.0 to 8.0. This aqueous solution of the mixture of melamine, formaldehyde and the melamine-formaldehyde initial condensate is hereinafter referred to as an "initial condensate solution". The initial condensate solution obtained by the above method was added to the above dispersion and mixed. The pH of the mixture was adjusted to 6.0 by adding a 3.6% by weight hydrochloric acid solution while stirring, the temperature was raised to 65° C., and the mixture was stirred for 360 minutes.

1. customprepared
2. dissolutionby dissolving a color
3. customto thereby obtain an emulsion

ORD record

ord-3d4f97b177a84a7588c854da17020088

Source dataset

uspto-grants-1990_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04918045