Hanwha Chemical Corporation

Hanwha Solutions Corporation

Cho Hee Ahn

Ju Young Park

Sang Hyun Cho

Byeong Hyeon Lee

Min Sung Kim

Jae Heon Kim

Seung Won Chae

Jeon Sik Kim

Kwang Seok Jeong

Provided are a method for preparing a polyetherketoneketone and a polyetherketoneketone prepared thereby, wherein, at the time of a polymerization reaction, nitrogen gas is blown into a liquid reaction medium while stirring, thereby quickly removing hydrochloric acid, which is a by-product generated during the reaction, and preventing aggregation of resin particles, thus suppressing the generation of scales.

Method for preparing polyetherketoneketone and polyetherketoneketone prepared thereby

The present invention relates to a method for preparing an aliphatic isocyanate capable of suppressing the occurrence of side reactions and the production of by-products. The method for preparing an aliphatic isocyanate comprises a step of reacting a salt of an aliphatic amine with phosgene, wherein the reaction step comprises a first reaction step in which phosgene is primarily added and reacted with the salt of an aliphatic amine salt at a temperature of 80 to 100&#xb0; C., and a second reaction step in which phosgene is secondarily added and reacted with the resultant product of the first reaction step at a temperature of 120 to 160&#xb0; C., and wherein the amount of the primarily added phosgene is a certain ratio of the total amount of the phosgene.

Method for preparing aliphatic isocyanate

Provided is a method capable of preparing high-purity aliphatic isocyanate, particularly, xylylene isocyanate in a high yield in a simple manner without an additional separate process, wherein when aliphatic isocyanate is prepared using phosgene, a side-reaction inhibitor capable of inhibiting side-reactions is introduced during phosgenation.

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Seoul, South Korea

Cho Hee Ahn