Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1991-11-22
1993-03-02
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
26433117, 264347, 4251744, B29C 7104
Patent
active
051907046
DESCRIPTION:
BRIEF SUMMARY
INDUSTRIAL UTILIZATION FIELD
The present invention relates to a surface treating and coating method for a molded article comprising a thermoplastic resin composition. More particularly, the present invention is concerned with a surface treating and coating method for a molded article comprising a thermoplastic resin composition well-balanced in rigidity, impact resistance, heat resistance dimensional stability and moldability, which composition comprises a thermoplastic resin and a functionalized polyolefin resin containing at least one member selected from the group consisting of carboxylic acid group-, carboxylic ester group- or acid anhydride group-containing monomers, epoxy group-containing monomers, hydroxyl group-containing monomers, amino group-containing monomers, alkenyl cyclic iminoether derivatives, and polyfunctional monomers, or a composition comprising the said composition and an inorganic filler or a rubbery substance incorporated therein.
PRIOR ART
Heretofore, thermoplastic resins such as polyolefin resins, e.g. polyethylene and polypropylene, and polyester resins, have been used in various fields, including automobile parts, household electric products and electronic devices. In order to enhance the added value of these products there has been conducted surface coating, printing or plating, or lamination thereto of base materials such as woven and non-woven fabrics, foam, and leather, or implantation of feathers therein. However, since polyolefin and polyester resins do not have a polar group, it is difficult to apply coating, bonding or printing thereto.
Generally, for the purpose of improving the coatability, etc. of the aforementioned products, there are conducted surface treatments such as physical treatments, e.g. sandblasting, flame treating, corona discharge, and treatment using plasma, or chemical treatments, e.g. treatment using chromic acid mixture or solvent.
However, such conventional physical treating methods involve the following problems: 1 the effect obtained is unsatisfactory, 2 the treating speed is low and treating time is long, 3 the apparatus is large-scaled and the process is complicated, and 4 the method is not economical.
The foregoing chemical methods also involves problems; for example, 1 environmental pollution, and 2 a considerable burden required for the disposal of liquid wastes used such as chemicals and solvents.
Both such conventional methods involve the problem that the coatability, printability and adhesive property in the use of coating materials, inks, and adhesives and base materials are still unsatisfactory.
SUBJECT TO BE ATTAINED BY THE INVENTION
In view of the above-mentioned points the present invention aims at providing a surface treating and/or coating method for molded articles extremely superior in coatability, printability and adhesive property.
MEANS FOR ATTAINING THE SUBJECT
Having made extensive studies for achieving the above-mentioned object, the present inventors found out that surface characteristics of molded articles could be improved without deterioration in rigidity, impact resistance, heat resistance, dimensional stability and moldability. In this way we accomplished the present invention.
More specifically, in a first aspect of the present invention there is provided a surface treating method for a thermoplastic resin molded article, characterized by radiating an ultraviolet light not longer than 300 nm in wavelength to the molded article, the molded article being formed by a composition containing: selected from B1: carboxylic acid group-, carboxylic ester group- or acid anhydride group-containing monomers, B2: epoxy group-containing monomers, B3: hydroxyl group-containing monomers, B4: amino group-containing monomers, B5: alkenyl cyclic iminoether derivatives and B6: Bolyfunctional monomers.
In a second aspect of the present invention there is provided a surface treating method for a thermoplastic resin molded article, characterized by radiating an ultraviolet light not longer than 300 nm in wavelength to the molded ar
REFERENCES:
patent: 3522076 (1970-07-01), Wright
patent: 3522226 (1970-07-01), Wright
patent: 4247496 (1981-01-01), Kawakami et al.
patent: 4933123 (1990-06-01), Yoshida et al.
patent: 5077082 (1991-12-01), Katoh et al.
International Search Report PCT/JP91/0068.
Iwasaki Yoshiharu
Katoh Kohichiroh
Nogiwa Motomi
Agency of Industrial Science and Technology
Nippon Petrochemical Company, Limited
Thurlow Jeffery
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