|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||106/464 ; 106/465 ; 423/430|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 2 인용 특허 : 12|
A method for producing a high solids slurry of an acid-resistant precipitated calcium carbonate for shipping purposes is disclosed. A low solids of about 18 wt. % to 20 wt. % solids slurry is treated with a chemical additive, such as sodium aluminate, in order to impart acid resistance to the calcium carbonate, and is dewatered to form an intermediate solids slurry of about 44 wt. %. This intermediate solids slurry is then diluted with a fraction of the low solids slurry which was treated with the chemical additive, in order to bring the intermediate slu...
[ What is claimed is:] [1.] A method for producing a stable, high solids aqueous slurry having a solids in a range from about 20% to about 40% by weight of an acid-resistant calcium carbonate for use as a filler in the manufacture of neutral to acidic paper products, the steps comprising:(a) forming an initial low solids slurry having a solids content in a range from about 10% to about 20% by weight of calcium carbonate particles;(b) adding at least about 0.1 percent, based on the dry weight of calcium carbonate, of sodium aluminate to the low solids slu...