TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The amount of the polyoxazine-based compound particles is 1-80 wt.%. The dispersion medium comprises at least one material comprising alcohol, water, acids, and hydrocarbonic solvents. The polyoxazine based compound particles have an average particle diameter of 0.5-10 mu m. The acid comprises a phosphoric acid-based material. The amount of the acid in the acid solution of the oxazine-based monomer is 1000-100000 parts by weight. The catalyst layer further comprises a catalyst, and the amount of the polyoxazine-based compound in the catalyst layer is 0.001-20 parts by weight. The oxazine-based monomer comprises at least one compound comprising heterocyclic compounds of formulae (1a)-(5a) and naphthalene compounds of formula (6a), preferably 6-fluoro-3-pyridin-2-yl-3,4-dihydro-2H-benzo(e)(1,3)oxazine, 6,7-difluoro-3-(4-fluoro-phenyl)-3,4-dihydro-2H-benzo(e)(1,3)oxazine, 3-(4-tert-butylphenyl)-6-(1-(3-(4-tert-butylphenyl)-2,4-dihydro-1,3-benzoxazin-6-yl)-2,2,2-trifluoro-1-(trifluoromethyl)ethyl)-2,4-dihydro-1,3-benzoxazine, 3-phenyl-6-(2,2,2-trifluoro-1-(3-phenyl-2,4-dihydro-1,3-benzoxazin-6-yl)-1-(trifluoromethyl)ethyl)-2,4-dihydro-1,3-benzoxazine, 3-pyridin-2-yl-3,4-dihydro-2H-pyrido(3,2-e)(1,3)oxazine, and phosphoric acid tris-(3-phenyl-3,4-dihydro-2H-benzo(e)(1,3)oxazin-6-yl) ester. In formula (I):R1-R4 = 1-20C alkyl group, 1-20C alkoxy, 2-20C alkenyl, 2-20C alkynyl, 6-20C aryl, 6-20C aryloxy, 2-20C heteroaryl, 2-20C heteroaryloxy, 4-20C carbon ring, 4-20C carbocyclic oxy group or 2-20C heterocyclic group (all optionally substituted), H, halo, OH or CN; andR5 = 1-20C alkyl, 1-20C alkoxy, 2-20C alkenyl group, 2-20C alkynyl, 6-20C aryl, 6-20C aryloxy, 7-20C arylalkyl, 2-20C heteroaryl, 2-20C heteroaryloxy, 2-20C heteroarylalkyl, 4-20C carbocyclic group, 4-20C carbocyclic alkyl, 2-20C heterocyclic group or 2-20C heterocyclic alkyl (all optionally substituted).In formula (II):R5 = 1-20C alkyl, 1-20C alkoxy, 2-20C alkenyl, 2-20C alkynyl, 6-20C aryl, 6-20C aryloxy, 7-20C arylalkyl, 2-20C heteroaryl, 2-20C heteroaryloxy, 2-20C heteroarylalkyl, 4-20C carbocyclic group, 4-20C carbocyclic alkyl, 2-20C heterocyclic group or 2-20C heterocyclic alkyl group (all optionally substituted); andR6 = 1-20C alkylene, 2-20C alkenylene, 2-20C alkynylene, 6-20C arylene, or 2-20C heteroarylene (all optionally substituted), C(=O) or SO2.In formula (III):A-E = carbon;one or two of A-E = N and others are C; andR7, R9 = ring, which is 6-10C cycloalkyl, fused 3-10C heteroaryl, 3-10C heteroaryl, 3-10C heterocyclic group, or fused 3-10C heterocyclic group.In formula (IV):A1a = 1-20C heterocyclic group, 4-20C cycloalkyl or 1-20C alkyl (all optionally substituted); andR9-R16 = H, 1-20C alkyl, 1-20C alkoxy, 6-20C aryl, 6-20C aryloxy, 1-20C heteroaryl, 1-20c heteroaryloxy, 4-20C cycloalkyl, 1-20C heterocyclic group, halo, CN or OH.In formula (V):R17, R19 = 1-20C alkyl, 1-20C alkoxy,6-20C aryl, 6-20C aryloxy or 3,4-dihydro-2H-benzo(e)(1,3)oxazine group of formula (5a); andR19, R19a = H, 1-20C alkyl, 1-20C alkoxy, 6-20C aryl, 6-20C aryloxy, halogenated 6-20C aryl, halogenated 6-20C aryloxy, 1-20C heteroaryl, 1-20C heteroaryloxy, halogenated 1-20C heteroaryl, halogenated 1-20C heteroaryloxy, 4-20C cycloalkyl, halogenated 4-20C cycloalkyl, 1-20C heterocyclic group or halogenated 1-20C heterocyclic group.In formula (VI):Either R20-R22 = H, 1-20C alkyl, 1-20C alkoxy, 6-20C aryl, 6-20C aryloxy, halogenated 6-20C aryl, halogenated 6-20C aryloxy, 6-20C heteroaryl, 1-20C heteroaryloxy, halogenated 1-20C heteroaryl, halogenated 1-20C heteroaryloxy, 4-20C carbocyclic group, halogenated 4-20C carbocyclic group, 1-20C heterocyclic group or halogenated 1-20C heterocyclic group; orat least two adjacent groups of R20-R22 are linked = group of formula (-CH2-N(R1a)-CH2-O-) (6a); either23-R25 = 1-20C alkyl, 1-20C alkoxy, 6-20C aryl, 6-20C aryloxy, halogenated 6-20C aryl, halogenated 6-20C aryloxy, 1-20C heteroaryl, 1-20C heteroaryloxy, halogenated 1-20C heteroaryl, halogenated 1-20C heteroaryloxy, 4-20C carbocyclic group, halogenated 4-20C carbocyclic group, 1-20C heterocyclic group or halogenated 1-20C heterocyclic group; orat least two adjacent groups R23-R25 are linked = group (6a); andR1a = 1-20C alkyl group, 1-20C alkoxy, 2-20C alkenyl, 2-20C alkynyl, 6-20C aryl, 6-20C aryloxy, 7-20C arylalkyl, 2-20C heteroaryl, 2-20C heteroaryloxy, 2-20C heteroarylalkyl, 4-20C carbocyclic group, 4-20C carbocyclic alkyl, 2-20C heterocyclic group or 2-20C heterocyclic alkyl (all optionally substituted).Preferred Process: The thermal treatment is performed at a temperature of 150-250 degrees C. The step of separating of the polyoxazine-based compound from the polymerization product comprises: adding water to the polymerization product and centrifuging the polymerization product to which the water is added, to obtain a centrifuged product; and separating the solid content from the centrifuged product. The step of mixing of the oxazine-based monomer and the acid is performed at a temperature of 50-100 degrees C. Preferred Composition: The polyoxazine based compound composition further comprises a cross-linkable compound. EXAMPLE - Phosphoric acid (200 g, 85 wt.%) was added to ((1E,3Z)-1-(6-fluoro-4H-benzo(e)(1,3)oxazin-3-yl)-penta-1,3-dienyl)-methylene-amine (2 g) and mixed at 80 degrees C for 1 hour to obtain a solution of ((1E,3Z)-1-(6-fluoro-4H-benzo(e)(1,3)oxazin-3-yl)-penta-1,3-dienyl)-methylene-amine in phosphoric acid. The solution was thermally treated at 160 degrees C for polymerization. The polymerization product was centrifuged to remove the phosphoric acid. The remaining centrifuged product was washed with water, and water was added to obtain a polybenzoxazine-based compound composition including 3.4 wt.% of polybenzoxazine-based compound particles.