Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Patent
1991-11-22
1993-08-31
Berman, Susan
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
522 81, 522 83, 522109, 522110, 522111, 522112, 523300, 524451, 524502, 524504, 524537, 525 64, 525 66, 525 67, 525 68, C08F 246, C08J 328, C08K 340, C08K 326
Patent
active
052409732
DESCRIPTION:
BRIEF SUMMARY
INDUSTRIAL UTILIZATION FIELD
The present invention relates to a surface activating method for molded articles of engineering plastics.
More particularly, the present invention is concerned with a surface activating method for a molded article well-balanced in rigidity, impact resistance, heat resistance, dimensional stability and moldability and comprising a polymer alloy which comprises at least two kinds of engineering plastics such as polyamides, polyesters, polycarbonates, polyacetals and a polyphenylene ethers, and a compatibilizer or a modifier, for example a polyolefin resin containing at least one functional member selected from 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 which comprises the said composition and an inorganic filler or a rubbery substance incorporated therein.
PRIOR ART
Engineering plastics such as polyamide resins and polyester resins are superior in heat resistance and mechanical characteristics bu inferior in moldability and resistance to chemicals and to oil, thus having merits and demerits.
Recently, in order to compensate for such drawbacks, studies have been made earnestly about polymer alloys prepared by mixing engineering plastics with each other, which polymer alloys are being used in various fields, including the fields of 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, such polymer alloys are inferior in coatability, adhesive property and printability, so generally require surface treatment or the use of a primer.
Heretofore, for the purpose of improving the coatability, etc. of molded articles there have been 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.
OBJECT 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 OBJECT
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 activating 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 resin composition containing:
(A) at least two kinds of engineering plastics, and
(B) a compatibilizer and/or a modifier.
In a second aspect of the present invention the
REFERENCES:
patent: 4127461 (1978-11-01), Paulen
patent: 4275180 (1981-06-01), Clarke
patent: 4528346 (1985-07-01), Sugie et al.
International Search Report PCT/JP91/0070.
Iwasaki Yoshiharu
Katoh Kohichiroh
Nogiwa Motomi
Berman Susan
Japan as represented by Director General of Agency of Industrial
Nippon Petrochemicals Company Limited
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