| abstract |
(57) [Summary] [Purpose] A primer composition and its pretreatment method used for adhesion, painting, lamination and compounding of difficult-to-bond plastic materials and inorganic materials such as glass, ceramics, concrete and metals. provide. [Structure] Acid-modified styrene block resin (a) having a Mw of 3,000 to 100,000 and epoxy-modified styrene block having an oxirane oxygen concentration of 0.5 to 7% by weight in one molecule having a Mw of 3,000 to 100,000. The resin (b) is blended in such a manner that the molar equivalent mixing ratio of the carboxyl group or the like of (a) and the epoxy group of (b) is 1: 0.5 to 0.5: 1, and (A) and (b) a primer composition which is liquid at room temperature with a good solvent (c), and a dry film thickness of the primer composition of 1 to 50 μm on a surface of a plastic material or a metal surface that is difficult to adhere to in advance. And then cured and cured through the primer-cured coating, adhesion, A method of processing a difficult-to-adhesive material, characterized by being subjected to a process of painting, lamination or compounding. |