| 摘要 |
The present invention provides a water-based coating composition having improved water resistance, weatherability and particularly improved staining resistance. This water-based coating composition comprises a water-based emulsion and colloidal silica in the range of 9 : 1 to 5.5 : 4.5 (based on the weight of the solid). This water-based emulsion is obtained via emulsification by addition of water to a resin solution which is obtained via solution polymerisation of 0.5% to 50% by weight of an unsaturated polymerisable monomer (A) which has a hydrolysable silyl group, 1% to 20% by weight of an unsaturated polymerisable monomer (B) having an ion-formable group, 1% to 40% by weight of an unsaturated polymerisable monomer (C) having a polymethyl siloxane structure and the remaining ratio by weight of another unsaturated polymerisable monomer. The polymerisation solvent of the resin emulsion is then removed to give the target water-based emulsion. |
