申请人:Toyo Seikan Kaisha, Ltd.
公开号:US04232086A1
公开(公告)日:1980-11-04
When a polyolefin layer is bonded to a metal substrate through a primer layer, if a polar group-containing ethylenically unsaturated monomer-modified olefin resin (A) having a specific polar group concentration and a specific degree of crystallinity and a coating film-forming base resin (B) are incorporated at a specific ratio into a specific mixed solvent to form a paint and the primer layer is formed by using this paint, there is obtained a novel multi-layer distribution structure comprising the base resin distributed predominantly in the portion of the primer layer contiguous to the surface of the metal substrate and the modified olefin resin distributed predominantly in the portion of the primer layer contiguous to the polyolefin layer and having a concentration gradient of the two components (A) and (B) in the thickness direction. By virtue of the presence of this primer layer, the bonding strength between the metal substrate and the polyolefin and the corrosion resistance of the metal substrate as well as the processability of the polyolefin-metal bonded structure are substantially improved.
当聚烯烃层通过底漆层与金属基底粘合时,如果将具有特定极性基团浓度和特定结晶度的含极性基团的乙烯基不饱和单体改性的聚烯烃树脂(A)和涂膜形成基础树脂(B)按特定比例混合到特定混合溶剂中形成涂料,并使用此涂料形成底漆层,则可获得一种新型的多层分布结构,其中基础树脂主要分布在与金属基底表面相邻的底漆层部分,而改性聚烯烃树脂主要分布在与聚烯烃层相邻的底漆层部分,并在厚度方向上具有两种组分(A)和(B)的浓度梯度。由于存在这种底漆层,金属基底与聚烯烃之间的粘合强度、金属基底的耐腐蚀性以及聚烯烃-金属粘合结构的加工性能都得到了实质性的提高。