Alkaline condensation of 2-methoxy-4, 6-diamino-S-triazine (MAT) with for-maldehyde (F) gives hydroxymethylated products (MMT) usually as a mixture of mono-, di-, tri-, and tetra-methylol derivatives. If the reaction velocities between each of the hydroxymethyl groups in MMT and the amino group of urea are equal, the mixture MMT would behave as a single compound containing the averaged ‘n’ moles of F. In order to confirm this assumption, the reaction velocities between MMT and urea in an acidic aqueous solution containing 1.25×10-3-3-2.08×10-2 N hydrochloric acid have been measured at 25, 30, 35, and 40°C by iodometric method. The concentration of MMT (n=2.13) in the solution was 0.025 mol/l, and that of urea, 1.5 mol/l. The following results were obtained:(1) The above assumption holds true until 20% of the total methylol groups have been reacted.(2) The velocity constant was approximately proportional to the acid concentration over the range 1.25×10-3-5.02×10-3 N at a given temperature.(3) The velocity constants at 25, 30, 35, and 40°C were in good agreement with the Arrhenius′ equation, and the activation energy was calculated to be 20.7 kcal/mol.
A new copolyamide was prepared by condensation polymerization of hexamethylene diammonium adipate and piperazine terephthalate. The polymer can be melt extruded by Koka Flow Tester. Hot-dry drawn fiber was of promising properties for practical use, and showed improved moisture regain and heat resistance over66 Nylon.
Polymerization of vinyl type monomers is effected by heating in the presence of a diazonium salt of azo chromogen which acts as a polymerization initiator, so as to give a new coloring agent, in which the azo chromogen is linked to vinyl resins. Either water soluble or oil soluble product can be synthesized by properly selecting the monomers used. The coloring agents so obtained can not be separated into chromogen and resin moieties by fractional precipitation or extraction. X-Ray diffraction patterns and electron microscopic photographs indicated that they were in the forms of ultraf ine dispersion and were of no definite crystalline form. Though they showed improved properties over the conventional coloring agents, their light-fastness was not fully satisfactory probably due to the nature of thechromogen employed.
The diazonium salts of various polycyclic chromogens were used as a polymeriz ation initiator for vinyl monomers according to the procedures reported in the preceding paper. A new type of light-fast coloring agents has thus been prepared through chemical combination of a polycyclic chromogen with a resin. They can not again be separated into chromogen and resin moieties by fractional precipitation or extraction. X-Ray diffraction patterns and electron microscopic photographs indicated that the coloring agents were in the forms of ultrafine dispersion andwere of no definite crystalline form. They showed properties including, lightfastness comparable to that of copper phthalocyanine coloring agents.