A peelable bonded structure comprising a metal substrate and a polyolefin layer bonded to the substrate through a primer layer, wherein the primer layer is a composition comprising (A) a modified olefin resin having a carbonyl group concentration of 0.01 to 200 milliequivalents per 100 g of the olefin resin and (B) a coating film-forming base resin at an (A)/(B) weight ratio of from 0.1/99.8 to 70/30. The primer layer has in at least one first planar region thereof a multi-layer distribution structure having a resin concentration gradient in the thickness direction such that the modified olefin resin (A) is distributed predominantly in the portion of the primer layer contiguous to the polyolefin layer and the base resin (B) is distributed predominantly in the portion of the primer layer contiguous to metal substrate, and in at least one second planar region the modified olefin resin (A) is distributed in the portion of the primer layer contiguous to the polyolefin layer at a lower distribution ratio.
可剥离粘结结构,包括
金属基板和通过底漆层与基板粘结的聚烯烃层,其中底漆层是一种组合物,包括(A)改性烯烃
树脂,其羰基浓度为每100克烯烃
树脂0.01至200毫当量,以及(B)涂层膜形成基础
树脂,其(A)/(B)重量比为0.1/99.8至70/30。底漆层在至少一个第一平面区域具有多层分布结构,在厚度方向上具有
树脂浓度梯度,使得改性烯烃
树脂(A)主要分布在与聚烯烃层相邻的底漆层部分,基础
树脂(B)主要分布在与
金属基板相邻的底漆层部分,在至少一个第二平面区域中,改性烯烃
树脂(A)以较低的分布比例分布在与聚烯烃层相邻的底漆层部分。