초록 ▼

A peelable bonded structure having a peel strength of 0.05 to 5 kg/cm comprises a plurality of articles, at least one of which is made of metal, bonded together through a composite coating layer. The composite coating layer is composed of adjacent first and second coating layers at least one of whic

A peelable bonded structure having a peel strength of 0.05 to 5 kg/cm comprises a plurality of articles, at least one of which is made of metal, bonded together through a composite coating layer. The composite coating layer is composed of adjacent first and second coating layers at least one of which comprises (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 0.2/99.8 to 40/60 and has a multi-layer distribution structure having resin concentration gradients in the thickness direction such that the modified olefin resin (A) is distributed predominantly in the portion contiguous to the interface between the two coating layers and the base resin (B) is distributed predominantly in the opposite portion.

대표청구항 ▼

A peelable bonded structure comprising a plurality of articles including at least one metal article bonded together through a composite coating layer, said composite coating layer comprising adjacent first and second coating layers, at least the first coating layer comprising: (a) an olefin resin (A

A peelable bonded structure comprising a plurality of articles including at least one metal article bonded together through a composite coating layer, said composite coating layer comprising adjacent first and second coating layers, at least the first coating layer comprising: (a) an olefin resin (A) modified with a copolymerized carbonyl group-containing ethylenically unsaturated monomer whereby said modified olefin resin contains carbonyl groups at a concentration of between about 0.01 and 200 milliequivalents per 100 g of the modified olefin resin and having a degree of crystallization at least about 50%; and (b) a coating film-forming base resin (B) at an (A)/(B) weight ratio of between about 0.2/99.8 and 40/60, and having a density greater by about 0.1 than the density of the modified olefin resin; and said first coating layer having a multi-layer distribution structure with resin concentration gradients in the thickness direction such that the modified olefin resin is distributed predominantly in the portion contiguous to the interface between the first and second coating layers and the base resin is distributed predominantly in the opposite portion, and wherein said plurality of articles have a peel strength of between about 0.05 and 5/kg/cm between the first and second coating layers. A bonded structure according to claim 1 wherein the metal substrate is a crown shell or cap shell, the polyolefin layer is a packing material and the entire structure is a vessel closure.