MODIFIED MELAMINE-FORMALDEHYDE RESIN, MIXTURE FOR ITS SYNTHESIS (VARIANTS), METHOD OF LAMINATE PREPARING BASED ON THEREOF Russian patent published in 2002 - IPC

FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to synthesis of modified melamine-formaldehyde resins by condensation of formaldehyde, urea, melamine and modifying agent comprising: a) a combination of 5-25 weight % of dicyanodiamide as measured for melamine, 8-30 weight % of water-soluble polyatomic alcohol with at least two hydroxyalkyl groups as measured for melamine or a combination a) + b) where b) comprises from 1.5 to 20 weight % of amines of formulas: (1a) NR₄R₅-R₁-X and/or (1b) NR₄R₅-R₂-Y-R₃-X where R₁ and R₃ can be similar or different and they mean linear or branched or cyclic residue of C₁-C₁₂-alkyl or alkylene depending on X value; R₂ means linear or branched or cyclic residue of C₁-C₁₂-alkylene; R₄ and R₅ can be similar or different and mean H or linear or branched residue of C₁-C₁₂- alkyl; X can present hydrogen atom, OH or NR₄R₅ and Y means -O- or - N/H- being molar ratio of melamine to formaldehyde is from 1 : 1.2 to 1 : 5 and molar ratio of melamine to urea is from 1 : 0.1 to 1 : 2.8. Invention relates to also their using for preparing laminates. Synthesized resins show improved physical-mechanical properties and laminates based on thereof are able to the following molding. EFFECT: improved method of synthesis and preparing, improved properties. 9 cl, 2 tbl, 6 ex