Phenolphthalein → Benzofurans

Beteiligte Stoffe

Reaktionsschritte

(A-2) 159 g of 3,3-bis (4-hydroxyphenyl)-2-benzofuran-1-on, 426.6 g of epichlorohydrin, and 160 g of a 50% alkali aqueous solution are mixed in a 1 L flask and reacted together at 95° C. for 1 hour to form a bisphenylbenzofuran-type epoxy resin. 215 g of the bisphenylbenzofuran-type epoxy resin is mixed with 450 mg of triethylbenzylammoniumchloride, 100 mg of 2,6-diisobutylphenol, and 72 g of acrylic acid. The mixture is heated up to 90 to 120° C. and completely dissolved, while air is blown therein at a speed of 25 Ml. Then, the dissolved product is cooled down to room temperature to form a non-colored transparent solid bisphenylbenzofuran-type epoxy acrylate. 287 g of the synthesized bisphenylbenzofuran-type epoxy acrylate is dissolved in 2 kg of cellosolveacetate. The solution is mixed with 10 g of 1,2,3,6-tetrahydrophthacid anhydride, 108.5 g of benzophenonetetracarboxylic acid dianhydride, and 1 g of tetraethylammonium bromide. The mixture is slowly heated up to 110 to 115° C. for 2 hours to form a cardo-based binder resin with a weight average molecular weight of 30,000 g/mol.

Herkunft & Nachweise