Melamine-form aldehyde resins

USA American Cyanamid Cymel 10776 9481 107 T Based on melamine-form-aldehyde resin and cellulose filler processable by moulding and injection moulding... 

A non-oxidizing alkyd contains non-drying (saturated) oils or fatty acids and therefore the alkyd is not capable of forming coherent film by air oxidation. Hence, the non-oxidizing alkyd is used as polymeric plasticizer or as hydroxyl-functional resin, which is cross-linked by melamine-formaldehyde or irrea-form-aldehyde resins or by isocyanatecross-linkers. The oil length for non-oxidizing alkyds is usually formulated below than 45% (Wicks et al., 1999). 

Group of plastics whose resins are formed by the condensation of melamine and aldehydes. 

Fig. 2.22 Temperature dependence of oxygen index for various plastics 1 rigid PVC, can not be measured above 105 due to softening 2 asbestos-filled phenol/form-aldehyde moulding compound 3 epoxy-modified melamine moulding compound 4 phenol/ formaldehyde moulding compound filled with wood flour 5 glass fibre-filled epoxy resin moulding...

Resorcinol-formaldehyde resins are cold-setting adhesives for wood structures. Urea-formaldehyde adhesives, commonly modified with melamine formaldehyde, are used in the production of plywood and in wood veneering for interior applications. Phenol-form-aldehyde and resorcinol-formaldehyde adhesive systems have the best heat and weather resistance. 

Aminoresins or aminoplastics cover a range of resinous polymers produced by reaction of amines or amides with aldehydes [14,46,47]. Two such polymers of commercial importance in the field of plastics are the urea-formaldehyde and melamine-formaldehyde resins. Formaldehyde reacts with the amino groups to form aminomethylol derivatives which undergo further condensation to form resinous products. In contras to phenolic resins, products derived from urea and melamine are colorless. 

Amino Rosins. Amino resins are the reaction product of an aldehyde with a compound containing an amino (—NH2) group (see Amino Resins). Both urea and melamine react with formaldehyde, first by addition to form methy-lol compounds, and then by condensation to form cross-linked polymers through methylene bridge and methylene ether formation. The cross-linking reactions are exothermic and produce water and formaldehyde as volatile products in reactions similar to resole phenolics, illustrated in equation 3. Urea-formaldehyde and melamine-formaldehyde account for the bulk of the amino resins. Their characteristics include water solubility and unlimited colorability with dyes and pigments. Applications include decorative high pressure phenolic laminates, adhesives in the laminated wood and furniture industries, and as an additive to textile fabrics to impart wash and wear properties. 

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