토너 입자 내부의 카본블랙의 분산성이 우수한 스타이렌 기반 현탁중합토너를 제조하기 위하여 카본블랙의 표면을 개질하였다. 산화반응을 통해 카본블랙 표면에 도입된 히드록시기와 유기산(올레산, 팔미트산, 아크릴산)의 카르복시기 사이의 에스터화 반응을 통해 표면이 유기화 개질된 카본블랙을 제조하였다. 카본블랙의 표면개질을 확인하기 위하여 FTIR을 이용하였다. 바인더 수지 모노머 혼합물에 대한 카본블랙의 가시적인 분산성 실험을 진행하였으며 입도분석기를 이용해 분산된 카본블랙의 입자 크기를 측정하였다. 광학현미경 사진을 분석한 결과 표면이 올레산으로 개질된 카본블랙을 사용할 경우 토너 입자 내부의 카본블랙의 분산성이 크게 향상되었다. 올레산으로 개질된 카본블랙을 이용해 제조한 중합토너는 입경 및 입경분포도 토너로서 이상적이었다.

Carbon black was surface-modified to prepare styrene-based suspension polymerized toner with excellent carbon black dispersibility inside toner particles. Carbon black was oxidized first to introduce hydroxyl groups on the surfaces, then esterification between the hydroxyl groups and carboxyl groups of organic acids (oleic acid, palmitic acid, acrylic acid) was followed to obtain organically surface-modified carbon black. The surface-modification of carbon black was confirmed by FTIR. Apparent carbon black dispersibility in the monomer mixture of the binder resin was tested and the particle size of dispersed carbon black was measured by particle size analyzer. Optical micrographs showed that carbon black dispersibility inside toner particles was improved considerably when the carbon black surfacemodified with oleic acid was used. The polymerized toner prepared with the carbon black surface-modified with oleic acid showed ideal particle size and size distribution as a toner.

Carbon Black Surface-modification Styrene Polymerized Toner Suspension Polymerization

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