PROBLEM TO BE SOLVED: To provide a silicic acid ester having both of dispersion stability and chemical stability in an aqueous product.SOLUTION: The silicic acid ester is represented by general formula (1) [wherein, m is a number of 0-3 Y is hydroxy, -O-(AO)n-R1, -O-R2 or -O-R3 A is 2-3C alkylene n is a number of 1-50 R1 is 1-24C linear or branched saturated or unsaturated hydrocarbon R2 is a residue obtained by removing one hydroxy group from a 6-24C functional alcohol R3 is 1-3C hydrocarbon and p, q, r and s of average numbers of moles substituted with -O-(AO)n-R1, -O-R2, -O-R3 and hydroxy per molecule are regulated so that p and q may be each a number within the range of from (m×0.05+0.1) to (m×1.95+3.9), r and s are each a number within the range of from 0 to (m×1.9+3.8), and the sum of p, q, r and s may be (m×2+4)].COPYRIGHT: (C)2011,JPO&INPIT【課題】水系製品中での分散安定性及び化学的安定性の両方に優れるケイ酸エステルの提供。【解決手段】下記一般式(1)で表されるケイ酸エステル。〔式中、mは0~3の数であり、Yは、水酸基、-O-(AO)n-R1基、-O-R2基又は-O-R3基を示す。AはC2~3のアルキレン基、nは1~50の数、R1はC1~24の直鎖又は分岐鎖の飽和若しくは不飽和の炭化水素基、R2はC6~24の機能性アルコールから水酸基を1つ除いた残基、R3はC1~3の炭化水素基を示す。一分子あたりの-O-(AO)n-R1基、-O-R2基、-O-R3基及び水酸基の平均置換モル数p、q、r、sについて、p、qはそれぞれ(m×0.05+0.1)~(m×1.95+3.9)の範囲にある数であり、r、sはそれぞれ0~(m×1.9+3.8)の範囲にある数であり、p、q、r及びsの和は(m×2+4)である。〕【選択図】なし
