Patent ID: 6099685
Filing Date: 2000-08-08
Classification: C08L,C09J,Y10T

Abstract:
A method of extrusion lamination comprising:(1) providing an adhesive resin composition consisting essentially of:(A) at least one component selected from the group consisting of (i) a polyolefin having a melt flow rate of 0.1 to 30 g/10 min and selected from the group consisting of ethylene homopolymers, propylene polymers, copolymers of ethylene with C.sub.3 -C.sub.16 .alpha.-olefin and a mixture thereof and (ii) an olefin polymer having at least one functional group selected from the group consisting of a carboxyl group, an amino group, a phenol group, a hydroxyl group, a thiol group, an acid anhydride group and a carboxylic acid metal salt group; and(B) an epoxy compound having at least two epoxy groups in the molecule and having a number average molecular weight of 3000 or less, the ratio of the weight of component (B) to the total weight of the components (A) and (B) being 0.01 to 1%, wherein said epoxy compound is:(i) phthalate diglycidyl ester,(ii) isophthalate diglycidyl ester,(iii) terephthalate diglycidyl ester,(iv) adipate diglycidyl ester,(v) trimethylolpropane polyglycidyl ether,(vi) polyglycerol polyglycidyl ether,(vii) pentaerythritol polyglycidyl ether,(viii) butanediol diglycidyl ether,(ix) epoxidized plant oil,(x) epoxidized animal oil,(xi) epoxidized liquid rubber,(xii) epoxidized silicone resin,(xiii) hydrogenated bisphenol A diglycidyl ether,(xiv) phenolnovolak polyglycidyl ether,(xv) 4,4'-diglycidyloxy-3,3',5,5'-tetramethylbiphenyl,(xvi) bis(4-glycidylaminophenyl)methane or(xvii) triglycidyl isocyanurate, and, optionally,(C) one or more additives selected from the group consisting of a plasticizer, a lubricant, a stabilizer, an antiblocking agent, an antistatic agent, a dye, a pigment other than a dye and a filler other than a pigment;(2) determining a temperature at which a surface of a film of the polyolefin component (A) is oxidized; and(3) extrusion laminating a substrate with the adhesive resin compositions, at the oxidizing temperature, wherein the surface of the film of the polyolefin component (A) is oxidized, whereby the epoxy compound (B) is first grafted to the compound (A) via a part of the epoxy groups; and then(4) allowing the unreacted epoxy groups remaining in the grafted epoxy compound (B) to be reacted with the substrate.