反应详情

A mixture of 1.0 mole of p-cresol, 1.2 moles of formaldehyde and 0.2 mole of ammonia is heated on a water bath to form an ammonia-cresol base resin. A quantity (40 parts) of this resin and 60 parts of a bisphenol-A type epoxy resin (Epikote® 1007 manufactured by Shell Chemical Company) are dissolved in a mixed organic solvent made up of equal amounts of methylisobutyl ketone and methylethyl ketone to form a base resin solution. Next, a maleic anhydride-modified olefin resin having 74.9% crystallinity and a degree of modification of 30.5 mg/100 g is dissolved in hot xylene to form a 10% solution. This solution is added to the base resin solution with sufficient agitation so that the amount of modified olefin resin added to the base resin is 20% (solids) based on the base resin. In this way, a primer coating composition or paint having a total solids content of about 30% is obtained.

1. temperatureis heated on a water bath