Patent
Aromatic resin and its production
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TLDR
In this article, a cross-linker was used to obtain an aromatherapy resin resin with high heat resistance and curability by reacting carbazole with a dihydroxymethylbenzene or dihalomethyl benzene compd. as a crosslinker.Abstract:
PURPOSE:To obtain an arom. resin excellent in heat resistance and curability by reacting carbazole with a dihydroxymethylbenzene or dihalomethylbenzene compd. as a cross-linker. CONSTITUTION:100 mol of carbazole is reacted with 50-300 mol of at least one cross-linker selected from the group consisting of a dihydroxymethylbenzene compd. and a dihalomethylbenzene compd. to give an arom. resin having structural units of formula I (wherein Bn is a group of formula II; and (m) is 0 or 1). The reaction is conducted in the prezence of a protonic acid such as an org. sulfonic acid, sulfuric acid, oxalic acid, or hydrochloric acid at 90-200 deg.C, pref. in the presence of a solvent such as methyl isobutyl ketone to facilitate the progress of the reacton. The obtd. resin softens at 50-150 deg.C and is thermally curable in the presence of a cure accelerator.read more
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