Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1991-11-25
1993-04-06
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
4251744, 427581, 427558, B29C 7104
Patent
active
052001229
DESCRIPTION:
BRIEF SUMMARY
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 composition which comprises a polypropylene, an engineering plastic, and a polyolefin resin functioning as a compatibilizer or a modifier and prepared by the reaction, addition or impregnation of 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.
Polypropylene resins are used for various molded articles because they are superior in moldability and chemicals resistance and are inexpensive. However, the use thereof is limited because polypropylenes involve problems in point of impact resistance, coatability, heat resistance and adhesive property.
On the other hand, engineering plastics such as polyamide resins and polyester resins are superior in heat resistance and mechanical characteristics, but are expensive and inferior in moldability, so are used after incorporation of various modifiers and additives therein.
Recently, studies have been made earnestly about polymer alloys comprising general-purpose resins such as polypropylene resins referred to above and engineering plastics also mentioned above, which polymer alloys are being used in various fields, including the fields of automobile parts, household electric products and electric 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.
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.
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 arti
REFERENCES:
patent: 3522076 (1970-07-01), Wright
patent: 3522226 (1970-07-01), Wright
patent: 4247496 (1981-01-01), Kawakami et al.
patent: 4528346 (1985-07-01), Sugie et al.
patent: 4803021 (1989-02-01), Werth et al.
patent: 4933123 (1990-06-01), Yoshida et al.
patent: 5023026 (1991-06-01), Yoshida et al.
patent: 5077082 (1991-12-01), Katoh et al.
International Search Report PCT/JP91/00069.
Iwasaki Yoshiharu
Katoh Koichiroh
Nogiwa Motomi
Japan as represented by Director Science and Technology
Nippon Petrochemicals Company Limited
Thurlow Jeffery
LandOfFree
Surface activating method for thermoplastic resin molded article does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Surface activating method for thermoplastic resin molded article, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface activating method for thermoplastic resin molded article will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-534343