| 摘要 |
In the curing and compounding of organic diisocyanate modified polyesters or polyamides, e.g. as prepared in Specification 553,733, by heating with formaldehyde in presence of catalysts as described in Specifications 580,524 and 580,526, the curing is performed in the presence of acid accepting substances insufficient in amount to inhibit the curing but sufficient to prevent scorching during the curing procedure. Acid accepting substances specified are ethanolamines, sodium acetate, sodium oleate, iron oxides, zinc oxide, magnesium oxide, litharge, zinc stearate, zinc diethyl dithiocarbamate, diphenyl guanidine. The formaldehyde liberating substances and the curing catalysts employed are the same as those described in the above Specifications. In examples, curing mixes comprise: (1) diisocyanite modified polyamide, hydroquinone, carbon black, paraformaldehyde and monoethanolamine, (2) with stearic acid and sodium oleate instead of ethanolamine. Fillers &c., as described in the above Specifications, may be added to the mixes and sodium-oleo-p-anisidine-2-sulphonate may be added as dispersing agent.
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