CEMENT ADDITIVE AND CEMENT COMPOSITION

• Main Authors: TAKAYAMA TAKESHI, KAWAMURA MARIE
• Format: Patent
• Language: English; Japanese
• Published: 13.07.2017
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; REFRACTORIES; SLAG; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF NATURAL STONE

PROBLEM TO BE SOLVED: To provide a cement additive which can sufficiently improve cement dispersibility in a cement composition and can reduce the amount of water-reducing agent, and provide a cement composition comprising such a cement additive.SOLUTION: A cement additive comprises a copolymer having a structural unit (I) derived from a specific unsaturated polyalkylene glycol ether monomer (a) and a structural unit (II) derived from hydroxyalkyl (meth) acrylate (b), and has a mass average molecular weight of 60000-140000.SELECTED DRAWING: None 【課題】セメント組成物におけるセメントの分散性を十分に向上させることができるとともに減水剤の量を低減できるセメント用添加剤を提供する。また、そのようなセメント用添加剤を含むセメント組成物を提供する。【解決手段】本発明のセメント用添加剤は、特定の不飽和ポリアルキレングリコールエーテル系単量体（ａ）由来の構造単位（Ｉ）とヒドロキシアルキル（メタ）アクリレート（ｂ）由来の構造単位（ＩＩ）を有する共重合体を含み、質量平均分子量が６００００〜１４００００である。【選択図】なし