TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): A 1,3,5-triazine ring-containing compound (i) and methacrylic acid 2-hydroxyalkyl of formula (ii) are reacted, to obtain 1,3,5-triazine ring-containing compound (I). Preferred Composition: The monomer (m2) is chosen from vinylic monomer, acryl-type monomer, methacryl-type monomer, allyl-type monomer and maleic acid-type monomer, or chosen from vinyl acetate, styrene, vinyl versatate, acrylic acid, acrylamide, 1-18C cyclic group, acrylic ester having linear or branched alkyl, methacrylic acid, methacrylamide, 1-18C cyclic group, methacrylic ester having linear or branched alkyl, aromatic allyl ester, heterocyclyl-containing allyl compound, maleic acid, maleic anhydride, maleimide, 1-18C cyclic group, maleic acid monoesterhaving linear or branched alkyl and maleic acid diester. The total amount of vinylic monomer, acryl-type monomer, methacryl-type monomer, allyl-type monomer and maleic acid-type monomer is 0-10 wt.% with respect to 90-100 wt.% 1,3,5-triazine ring-containing compound (I).    TECHNOLOGY FOCUS - POLYMERS - Preferred Process: The homopolymerization or copolymerization with another monomer is carried out by radical polymerization using radical polymerization initiator. The radical polymerization is solution polymerization using organic solvent. Preferred Composition: The aminoplast resin is melamine resin having 2 or more alkoxy methyl groups in molecule. Preferred Definitions:    n=2-4.    EXAMPLE - 10 g 2-Chloro-4,6-diphenyl-1,3,5-triazine was added to 300 mL four-neck flask, 100 g tetrahydrofuran was added, dissolved, resulted solution was cooled at 0 degrees C, 1.8 g sodium hydride was added, 5.3 g methacrylic acid 2-hydroxyethyl and solution of 80 g tetrahydrofuran were dripped, and stirred for 30 minutes. To the resulted solution 15 wt.% ammonium chloride aqueous solution was added, extracted using ethyl acetate, anhydrous magnesium sulfate was added to the separated organic layer, filtered, solvent was distilled using rotating evaporator, purified using silica column chromatography, to obtain 9.7 g 2-(2-((3-methylbuta-1,3-dien-2-yl)oxy)ethoxy)-4,6-diphenyl-1,3,5-triazine.