| abstract |
An additive composition comprising a thickener and a thixotropic agent, wherein the thickener is cellulose or a derivative thereof, and the thixotropic agent has a surface modified to a group represented by the general formula -SiR a R 1 b OR 2 c Is a pyrolysis manufactured silicic acid. In this general formula, a is 1, 2, or 3, b is 0, 1, or 2, c is 0, 1, or 2, a + b + c is 3, R is monovalent, selectively monounsaturated or poly Unsaturated and selectively branched and hydrocarbon groups having 1 to 24 carbon atoms, R 1 is likewise monovalent, selectively monounsaturated or polyunsaturated and selectively branched A hydrocarbon group having 1 to 20 carbon atoms, R 2 is a hydrogen atom and is monovalent, selectively monounsaturated or polyunsaturated and selectively branched, and 1 to 20 carbon atoms Or, it is a hydrocarbon group having a bond with another Si atom, but at least one of R and R 1 is a hydrocarbon group having 4 or more carbon atoms. |