Polymerization melamine

These resins are used to make unbreakable plastic plates and for the famous kitchen surface Formica . Partly polymerized melamine-formaldehyde mixtures are layered with other polymers such as cellulose (Chapter 49) and phenol-formaldehyde resins and the polymerization is completed under pressure with heat, The result is the familiar, tough, heat-resistant surface. 

The Calco Chemical Division of American Cyanamid, formed in 1939, was synonymous with the industrial production of the triaminotriazine melamine (101), and of the polymeric thermosetting resins that also bear its name. Polymeric melamine is converted by the action of heat or catalysts, or both, into insoluble infusible solids, which are odorless, tasteless and generally inert chemically. 

Developments in coatings technology have been reflected in the types of amino resins used. Melamines have grown in general at the expense of ureas, and the higher solids, more monomeric melamines have grown at the expense of conventional polymeric melamines. 

Chem. Descrip. Acid phosphate catalyst (50%), isobutanol Uses Catalyst for high NH/polymeric melamines and phenolic crosslinkers for use in coatings for appliances, automotive, can, coil, general industrial, paper, ink and wood... 

Uses Blocked catalyst in coil and general industrial coatings, for high NH/polymeric melamines Features Good stability... 

Chem. Descrip. Acid phosphate in water/isopropanol Uses Blocked catalyst imparting hardness, gloss, humidity, and corrosion resist., and improved mechanical props, for aq. systems Features Offers min. cure 90 C, lower cure temps, for aq. systems using high NH/polymeric melamines... 

TSX/A Ethylacetoacetate Eascat catalyst, NH/polymeric melamines coil... 

Tehaisopropyl titanate Tehakis (2- catalyst, NH/polymeric melamines ... 

Tyzor AA Tyzor DC Tyzor EA catalyst, NH/polymeric melamines paper... 

Lee etal. have synthesized microcapsules containing conducting PANI core by polymerizing melamine resin. It is found that the melamine resin plays the role of an insulator shell for the PANI core and causes the electric conductivity of the core PANI particles to decrease. These PANI-encapsulated particles show typical ER effect, which is depending on the melamine resin content [87]. 

Diisopropyl perdicarbonate catalyst, polymerization melamine-formaldehyde-modified alkyd food-contact coatings... 

Similarly, gravity-driven deposition was studied in Refs. 149 and 150 using the sedimentation cell and polymeric (melamine) partieles with size 1.68 pm and specifie density 1.5 g/cm. The influence of the ionic strength, varied between 5 x 10 M and 10 M, on 0 was systematically studied. It was found that the maximum coverage dependence on the ionic strength can be described well by Eq. (198b) with the hard-particle value 0oo equal to 0.61. 

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