METHOD FOR COATING POLYOLEFIN RESIN

• Main Authors: HARA HIROBUMI, FUKUDA MASAO, EBISAWA HIROO, NOZAKI HITOYOSHI
• Format: Patent
• Language: English
• Published: 05.11.1986
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; SPRAYING OR ATOMISING IN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING-UP

PURPOSE:To conduct imexpensively coating without using any org. solvent for pretreatment, by degreasing the surface of a polyolefin resin molding, treating it with O2 plasma, applying a primer or a surfacer thereto and then applying a topcoating thereto. CONSTITUTION:A molding of a polyolefin resin such as polyethylene or polypropylene is immersed in a degreasing tank containing sodium metasilicate to degrease it. The molding is treated with O2 plasma in a plasma treating device to bond activated oxygen radical on the surface of the molding as carboxyl group, whereby surface energy is increased to enhance the bond strength of a coating film. A primer or a surfacer is applied to the surface of the molding 1 in such an amount to fill the recessed parts of grain 1a, and a topcoating is then applied thereto and curved by baking to thereby obtain a molding coated with good adhesion.