Sumitomo Chemical Company, Limited

Director-general of Agency of Industrial Science and Technology

Satoru Sogabe

Hideo Shinonaga

Hiroomi Abe

Kiyoshi Mitsui

Yasuro Suzuki

Susumu Kanzaki

Hiroyuki Harada

Yuji Ikezawa

Kyoji Suzuki

Takashi Sanada

Takeshi Fujii

Taichi Nishio

Kaoru Kitadono

Satoru Hosoda

Kohichiroh Katoh

Keitaro Kojima

Process for producing resin molded article

A polypropylene resin composition, which exhibits an excellent coating adherence, high rigidity, high impact strength at low temperatures, prominent heat resistance and excellent appearance of moldings even without effecting a treatment with trichloroethane as a pretreatment step before coating, comprises 30 to 92% by weight crystalline ethylene propylene block copolymer (A), 5 to 30% by weight ethylene-.alpha. olefin copolymer rubber (B), 3 to 20% by weight ethylene-butene-1 copolymer (C) having the following characteristics:

Polypropylene resin composition

Methods for surface treating and paint-coating resin composition molded

Polypropylene resin composition having an improved compatibility with

A polypropylene resin composition, which exhibits an excellent coating adherence, high rigidity, high impact strength at low temperatures, prominent heat resistance and excellent appearance of moldings as required for coatings on the exterior parts of automobiles even without effecting a treatment with trichloroethane as pretreatment step before coating and without a primer as undercoating and which can be baked at a temperature of 130.degree. C. or higher, comprises 15 to 92% by weight crystalline ethylene propylene block copolymer, 5 to 40% by weight ethylene propylene copolymer rubber, 1 to 15% by weight polypropylene oligomer containing hydroxyl group, and 2 to 30% by weight inorganic filler.

A thermoplastic resin composition containing a polyamide resin composition (C) consisting of a polyamide resin (A) and another thermoplastic resin (B) and at least one modifier (D) is excellent in coatability, mechanical properties, linear expansion coefficient and appearance, can be molded into an article which comprises the polyamide resin (C), wherein the ratio of the percent occupied area of the polyamide resin on the surface of the article to the weight percentage of the polyamide in the polyamide resin composition (C) is not less than 1.2, and/or the ratio of the percent concentration of the polyamide resin on the surface of the article determined on the basis of the nitrogen concentration on the surface of the article to the weight percentage of the polyamide in the polyamide resin composition (C) is not less than 1,2, which article is suited for electric and electronic parts and automobile parts such as a bumper, fender and wheel cover.

Thermoplastic resin composition and article comprising the same

A method for coating a polypropylene resin molding is disclosed, comprising irradiating the surface of a molding of a polypropylene resin selected from a polypropylene and a propylene-ethylene block copolymer with an ultraviolet light having an irradiating wavelength in the region of 300 nm or less, coating the irradiated surface with a primer, and further coating the coated surface with a coating material. A method for coating a polypropylene resin molding is also disclosed, comprising coating the surface of a molding of a polypropylene resin selected from a polypropylene and a propylene-ethylene block copolymer with a primer, irradiating the coated surface with an ultraviolet light having an irradiating wavelength in the region of 300 nm or less, and further coating the irradiated surface with a coating material.

Coating method for polypropylene resin moldings

A surface treatment method of a polyamide resin composition molded article is disclosed, comprising bringing the surface of a polyamide resin composition molded article into contact with water, said polyamide resin composition molded article comprising (C) 100 parts by weight of a resin composition comprising (A) from 10 to 80% by weight of a polyamide resin and (B) from 20 to 90% by weight of other thermoplastic resin; and (D) from 0 to 20 parts by weight of at least one modifier selected from a carboxylic acid having at least 2 carboxyl groups in the molecule or a derivative thereof, an amine containing at least 2 nitrogen atom in the molecular, urea or a derivative thereof, and a low-molecular weight polyamide. A coating method of a polyamide resin composition molded article is also disclosed, comprising, after bringing the surface of a resin composition molded article into contact with water, coating the surface with a coating composition.

Surface treatment method and coating method of polyamide resin molded

The present invention provides a method which enables the surface of a molded article of a polypropylene resin to be modified to a surface suitable for coating, bonding, printing, etc. A molded article of a polypropylene resin comprising polypropylene, an ethylene-propylene copolymer rubber and an ethylene-acrylic acid or ethylene-methacrylic acid copolymer and optionally a filler is irradiated in the air with a light from a synthetic quartz low pressure mercury lamp having an output of 200 W for 60 sec with the distance between the surface of the molded article and the lamp being kept at about 10 cm.

Method of treating surface of molded article of polypropylene resin and

A method for surface treating a resin composition molded article and a method for coating a resin composition molded article are disclosed, which comprise irradiating a molded article with ultraviolet light having an irradiation wavelength in the region of 300 nm or less and, if desired, coating the thus UV-irradiated surface with a coating, the molded article being obtained from a resin composition comprising (I) 100 parts by weight of a resin composition comprising (A) from 5 to 99.5% by weight of a polypropylene resin selected from the group consisting of polypropylene, modified polypropylene, and a modified polypropylene/polypropylene composition and (B) from 0.5 to 95% by weight of at least one thermoplastic resin selected from the group consisting of a polyamide resin, a polyphenylene ether resin, a mixture of a polyphenylene ether resin and a styrene resin, a graft copolymer of a polyphenylene ether resin and styrene, and a saturated polyester resin; and (II) up to 30 parts by weight of at least one compatibilizer for improving compatibility between the polypropylene resin (A) and the thermoplastic resin (B), the compatabilizer being selected from the group consisting of an unsaturated carboxylic acid compound having at least one carboxyl group in the molecule thereof or a derivative thereof, a diamine compound having at least two nitrogen atoms in the molecule thereof or a derivative thereof, and an epoxy-containing copolymer.

Method for surface treating and coating resin composition molded articles

A method for surface treating a thermoplastic resin shaped article is disclosed, which comprises irradiating a surface of the shaped article with an ultraviolet light having a wavelength of 300 nm or less, said shaped article being obtained from a resin composition comprising (I) 100 parts by weight of a resin comprising from 5 to 100% by weight of a polyphenylene ether resin, a mixture of a polyphenylene ether resin and a styrene resin; or a graft copolymer of a polyphenylene ether resin and styrene and from 95 to 0% by weight of at least one thermoplastic resin selected from the group consisting of a polyamide resin and a saturated polyester resin; (II) from ) 0 to 50 parts by weight of a rubbery substance; (III) from 0 to 50 parts by weight of an inorganic filler and/or glass fibers; and (IV) from 0 to 10 parts by weight of at least one compatibilizer for improving the compatibility between said polyphenylene ether resin and said polyamide resin and/or saturated polyester resin. A method for coating said shaped article is also disclosed.

Method for surface treating and coating thermoplastic resin shaped

A method for treating the surface of a molded article, which comprises a combination of the steps of:

Method of treating surface of molded article of thermoplastic elastomer

A thermoplastic resin composition is obtained by blending 100 parts by weight of a resin blend consisting of 10 to 90% by weight of at least one polypropylene type resin (A) selected from the group consisting of modified polypropylenes and compounds composed of modified polypropylenes and polypropylenes, and 90 to 10% by weight of a polyamide resin (B); 2 to 30 parts by weight of an epoxy group containing copolymer (C) and 2 to 100 parts by weight of an ethylene-.alpha..beta.-unsaturated carboxylic acid alkyl estermaleic anhydride terpolymer (D). The composition can easily be processed into a molded product, a film, a sheet or the like by a conventional processing method such as injection molding and extrusion molding. The resulting product has a very good balance in physical properties such as heat resistance, coating properties, impact strength and flexural modulus. The composition of this invention is useful in the fields of automobiles, electric industry and electronic industry.

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Sodegaura, Japan

Satoru Sogabe