|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||C04B-014/00 C04B-033/04 C09C-003/00 D21F-001/10|
|미국특허분류(USC)||106/465 ; 106/288R ; 106/306 ; 106/309|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 7 인용 특허 : 4|
The invention relates to a structured kaolinitic pigment having improved physical and optical characteristics when incorporated as a filler or coating pigment in paper. The pigment consists of porous aggregates of kaolin particles which are chemically bonded together. The pigment may be produced by chemically reacting a particulate kaolin with a metal chloride, such as silicon tetrachloride, and with urea or an organic amine. The process is conducted under conditions such that the kaolinite structure is not altered.
A process for producing a structured kaolin pigment having enhanced light scattering and opacifying properties when incorporated in paper; said process comprising the steps of: (a) forming a feed mixture of a fine particle size kaolin; and (b) aggregating the kaolin particles to form the structured pigment, by combining said feed mixture in particulate form with a metal chloride having the general formula MClx where M is Si, Al or Ti, and x is 3 or 4 in accordance with M, and with urea or an organic amine; the moisture level present in the said feed mixt...