초록 ▼

A water dispersible coating composition is prepared by reacting together at elevated temperature in the presence of an amine 40 to 90% by weight of an epoxy resin composition of average epoxy functionality 1.0 to 2.0 epoxide groups per molecule and 10 to 60% by weight of a polymer containing carboxy

A water dispersible coating composition is prepared by reacting together at elevated temperature in the presence of an amine 40 to 90% by weight of an epoxy resin composition of average epoxy functionality 1.0 to 2.0 epoxide groups per molecule and 10 to 60% by weight of a polymer containing carboxylic acid groups. The ratio of carboxylic acid groups to epoxide groups is 1.5:1 to 20:1. The reaction is carried out in a mixture of a water miscible organic solvent with 5 to 30% of water based on the combined weight of epoxy resin and polymer containing carboxylic acids groups. A coating composition in the form of a stable dispersion is produced by mixing the water dispersible coating composition prepared as described above with a base and sufficient water to form a predominantly aqueous continuous phase.

대표청구항 ▼

A process for preparing a water dispersible coating composition comprising: (A) reacting together at elevated temperature (a) 40-90 percent by weight of an epoxy resin composition of average epoxy functionality 1.0 to 2.0 epoxide groups per molecule and average molecular weight 2000 to 12,000 and (b

A process for preparing a water dispersible coating composition comprising: (A) reacting together at elevated temperature (a) 40-90 percent by weight of an epoxy resin composition of average epoxy functionality 1.0 to 2.0 epoxide groups per molecule and average molecular weight 2000 to 12,000 and (b) 10-60 percent by weight of a polymer containing carboxylic acid groups which is an addition copolymer of 10-85 percent by weight of an olefinically unsaturated carboxylic acid and 90-15 percent by weight of at least one olefinically unsaturated comonomer, the ratio of carboxylic acid groups in (b) to epoxide groups in (a) being from 1.5:1 to 20:1, and (B) carrying out said reaction in the presence of 0.5 to 3.0 percent by weight of an amine in a mixture of a water miscible organic solvent with 5 to 30 percent by weight of water, the percentages of amine and of water being based on the combined weight of epoxy resin (a) and copolymer (b).