PROBLEM TO BE SOLVED: To provide a dentifrice composition whose prescription design is easy, use feeling is not heavy to a user, and which leaves less white residue due to drying by suppressing transpiration of water component.SOLUTION: A dentifrice composition contains silica dispersion stabilizer for oral cavity and thickening silica. The silica dispersion stabilizer for oral cavity has the weight-average molecular weight from 10,000 to 5,000,000, and consists of a copolymer which contains a single polymer which consists of constitutional unit (A) based on 2-(meth)acryloyloxy ethyl phosphorylcholine, or at least one type of constitutional unit selected from the group consisting of the constitutional unit (A) based on 2-(meth)acryloyloxy ethyl phosphorylcholine, a constitutional unit (B1) based on alkyl group-containing (meth)acrylic monomer, and a constitutional unit (B2) based on quaternary ammonium group-containing (meth)acrylic monomer, and a molar ratio of the constitutional unit (A)/(at least one type of constitutional unit selected from the group consisting of the constitutional unit (B1) and the constitutional unit (B2)) is 10/90 to 90/10.SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT【課題】処方設計が容易で、使用者に対して使用感が重くなく、かつ水分の蒸散を抑制することで乾燥による白残りが少ない歯磨剤組成物の提供。【解決手段】歯磨剤組成物は、口腔用シリカ分散安定化剤と、増粘性シリカとを含有する。口腔用シリカ分散安定化剤は、重量平均分子量が10,000~5,000,000であり、2-(メタ)アクリロイルオキシエチルホスホリルコリンに基づく構成単位(A)からなる単独重合体、もしくは、2-(メタ)アクリロイルオキシエチルホスホリルコリンに基づく構成単位(A)と、アルキル基含有(メタ)アクリル系単量体に基づく構成単位(B1)、および4級アンモニウム基含有(メタ)アクリル系単量体に基づく構成単位(B2)からなる群から選ばれる少なくとも1種の構成単位とを含有し、構成単位(A)/(構成単位(B1)および構成単位(B2)からなる群から選ばれる少なくとも1種の構成単位)のモル比が10/90~90/10である共重合体からなる。【選択図】なし
