Laminate and process for producing the same
View Patent ↗An object of the invention is to provide a laminate which is good in adhesiveness between a substrate and a thin film laminated thereon by a dry film-forming method such as a chemical vapor growth method or a vacuum evaporation method even if the substrate is a polymer substrate made of a nonpolar polymer; and a process for producing the same. In order to attain the above-mentioned object, the invention provides a laminate comprising a polymer substrate, a primer layer comprising a cyclized rubber which is a conjugated diene polymer cyclized product or a derivative thereof, the layer being formed on the surface of the polymer substrate, and a thin film laminated on the surface of the primer layer by a dry film-forming method; and a process for producing the same.
1. A process for producing a laminate, comprising the step of laminating a thin film, on a surface of a polymer substrate produced by incorporating a cyclized rubber, which is a conjugated diene polymer cyclized product or a derivative thereof, into a polymer-molding material made of a non-polar hydrocarbon resin, by a dry film-forming method,
wherein the film thickness of the thin film is from 1 nm to 100 μm; and a cyclization ratio of the cyclized rubber is from 60% to 90%.
2. The process for producing a laminate according to claim 1 , wherein the weight-average molecular weight of the cyclized rubber is from 1,000 to 1,000,000.
3. The process for producing a laminate according to claim 1 , wherein the amount of gel in the cyclized rubber is 10% or less by weight.
4. The process for producing a laminate according to claim 1 , wherein the cyclized rubber is the derivative of the conjugated diene polymer cyclized product, and further wherein the derivative of the conjugated diene polymer cyclized product is a compound produced by introducing a polar group into the conjugated diene polymer cyclized product by a modifying reaction using a polar-group-containing compound.
5. The process for producing a laminate according to claim 4 , wherein the polar group is at least one group selected from the group consisting of an acid anhydride group, a carboxyl group, a hydroxyl group, an ester group, an epoxy group, and an amino group.
6. The process for producing a laminate according to claim 4 , wherein the ratio of the introduced polar group is from 0.1 to 200 millimoles per 100 g of the cyclized rubber.
7. The process for producing a laminate according to claim 1 , wherein the incorporated amount of the cyclized rubber is from 0.1 to 50 parts by weight for 100 parts by weight of the polymer-molding material.
8. The process for producing a laminate according to claim 1 , wherein the polymer which constitutes the polymer-molding material is a linear olefin resin or a cyclic olefin resin.
9. The process for producing a laminate according to claim 1 , wherein the thin film is made of aluminum, nickel, zirconium, gold, copper, titanium, chromium, a metal oxide, a metal nitride, or an amorphous carbon film.
10. The process for producing a laminate according to claim 1 , wherein the cyclized rubber is obtained by dissolving a conjugated diene polymer into a hydrocarbon solvent, causing the conjugated diene polymer to react in the presence of an acid catalyst, subsequently inactivating the acid catalyst, and removing the residue of the acid catalyst and the hydrocarbon solvent.