Abstract: A resin composition comprises 1 to 60 parts by weight of a wollastonite fiber (in which the number-average fiber length is 1 to 30 ?m, the number-average fiber diameter is 0.1 to 10 ?m, and the proportion of the number of a fiber having a fiber length of 5 to 25 ?m relative to the total number of the fiber is 20 to 75%) and 0.1 to 20 parts by weight of an acid- or epoxy-modified olefinic resin having a melting point of 100 to 170° C., relative to 100 parts by weight of a thermoplastic resin (e.g., a polycarbonate-series resin). The weight-average molecular weight of the modified olefinic resin may be about 2.5×104 to 30×104. The resin composition may comprise a flame retardant. The combination use of the wollastonite fiber and the modified olefinic resin improves heat resistance, impact resistance and weld strength, even in the case of using a wollastonite fiber having a number-average fiber diameter of about 4 to 7 ?m and an average aspect ratio of about 1.5 to 3.

Abstract: The present invention provides a joining method using a method of laser welding wherein two resin molded bodies can be joined with high welding strength. Specifically, this is a method that joins two thermoplastic resin molded bodies using a method of laser welding; the first resin molded body is a laser light transmissive molded body comprising a thermoplastic resin and cellulose fibers with an ?-cellulose content of 80% or more; the second resin molded body is a laser light absorbent molded body containing a thermoplastic resin and a colorant; and the first resin molded body and the second resin molded body are welded by irradiating laser light from the first resin molded body side.

Abstract: The present invention provides a joining method using a method of laser welding wherein two resin molded bodies can be joined with high welding strength. Specifically, this is a method that joins two thermoplastic resin molded bodies using a method of laser welding; the first resin molded body is a laser light transmissive molded body comprising a thermoplastic resin and cellulose fibers with an ?-cellulose content of 80% or more; the second resin molded body is a laser light absorbent molded body containing a thermoplastic resin and a colorant; and the first resin molded body and the second resin molded body are welded by irradiating laser light from the first resin molded body side.

Abstract: A resin composition comprises 1 to 60 parts by weight of a wollastonite fiber (in which the number-average fiber length is 1 to 30 ?m, the number-average fiber diameter is 0.1 to 10 ?m, and the proportion of the number of a fiber having a fiber length of 5 to 25 ?m relative to the total number of the fiber is 20 to 75%) and 0.1 to 20 parts by weight of an acid- or epoxy-modified olefinic resin having a melting point of 100 to 170° C., relative to 100 parts by weight of a thermoplastic resin (e.g., a polycarbonate-series resin). The weight-average molecular weight of the modified olefinic resin may be about 2.5×104 to 30×104. The resin composition may comprise a flame retardant. The combination use of the wollastonite fiber and the modified olefinic resin improves heat resistance, impact resistance and weld strength, even in the case of using a wollastonite fiber having a number-average fiber diameter of about 4 to 7 ?m and an average aspect ratio of about 1.5 to 3.

Abstract: A resin composition capable of laser marking according to the present invention includes a polyolefin resin in combination with a laser-sensitive component such as a carbon black or metallic compound white pigment and a dispersing aid such as a higher fatty acid compound. The polyolefin resin includes, for example, a polypropylene. The resin composition may further include about 0.5 to 30 parts by weight of an elastomer relative to 100 parts by weight of the polyolefin resin. By irradiating an surface of a molded article obtained from the resin composition with a laser, a mark having a sharp and uniform contrast can be formed on the surface of the molded article.

Abstract: A resin composition comprises a thermoplastic resin, a non-terpene-series higher fatty acid or a derivative thereof and a black pigment. As the higher fatty acid or derivative thereof, use can be made of, for example, a saturated higher fatty acid having about 12 to 30 carbon atoms or a metal salt thereof. As the thermoplastic resin, use can be made of, for example, an acrylic resin A and a styrenic resin B. As the black dye or pigment, use can be made of, for example, carbon black. The resin composition may contain a dye or pigment such as titanium oxide. A clearly defined white marking is developed on the above resin composition by laser irradiation.

Abstract: A resin composition for a white marking, on which a white marking can be clearly developed by irradiation of laser beams, comprises an acrylic resin A, a styrenic resin B, and a black dye/pigment C. Use can be made of poly(methyl methacrylate) as the resin A, a rubber-modified styrenic resin such as an ABS resin as the resin B, and a carbon black as the black dye/pigment C. The proportion of the resin A to the resin B (the former/the latter, by weight) is about 1/99 to 99/1. The proportion of the black dye/pigment C is about 0.01 to 3 parts by weight relative to 100 parts by weight of the total amount of the resin A and the resin B. The resin composition may further comprise a white dye/pigment D such as titanium oxide in 0.01 to 10 parts by weight, relative to 100 parts by weight of the total amount of the resins A and B.

Abstract: A composite member is obtained which includes a thermoplastic resin and a rubber directly and firmly adhering to each other. A composite member is obtained by adhering a molded element of a thermoplastic resin including a homo- or co-polymer of a vinyl cyanide including acrylonitrile, and a rubber molded element constituting a rubber composition containing a vinyl cyanide as a comonomer by means of heating. The resin molded element may be formed from, for example, AS resin, ABS resin or an polymer alloy containing ABS resin. The rubber molded element may be composed of a vulcanizable rubber composition containing NBR or another rubber. Both the molded elements can adhere to each other by contacting the resin molded element with the rubber molded element closely and heating at least either the resin molded element or the rubber molded element by means of melting, vulcanization or the like.

Abstract: The present invention provide a flame-retardant resin composition having an extremely low adhesion to metals and excellent thermal stability and light resistance and free from the formation of black extraneous matter. A flame-retardant thermoplastic resin composition characterized by being prepared by incorporating 1 to 1,000 ppm of a basic inorganic compound (D) soluble in a solvent into a resin composition (C) composed of 60 to 98% by weight of a thermoplastic styrene resin (A) and 40 to 2% by weight of a halogenated epoxy flame-retardant (B) having a terminal epoxy group.

Abstract: Disclosed are a lactone-modified polyvinyl alcohol and a process for the preparation thereof, a polymer composition, a permanently anti-electrostatic resin composition, a lactone-modified resin having hydroxyl groups, and a process for the preparation thereof. The lactone-modified polyvinyl alcohol can be used in wide fields owing to the capability of freely adjusting the water solubility, such as water-soluble, gradually water-soluble, low water-soluble, and water-insoluble by a degree modified by lactone compounds, and owing to possessing properties both of PVA and lactones. Furthermore, the lactone-modified polyvinyl alcohol has properties such as being plasticizers or softening agents, and as a result, there can be provided a polymer composition having excellent properties by mixing with a hydrophilic polymer or polar polymer.

Abstract: Disclosed are a lactone-modified polyvinyl alcohol and a process for the preparation thereof, a polymer composition, a permanently anti-electrostatic resin composition, a lactone-modified resin having hydroxyl groups, and a process for the preparation thereof.The lactone-modified polyvinyl alcohol can be used in wide fields owing to capability of freely adjusting a water solubility such as water-soluble, gradually water-soluble, low water-soluble, and water-insoluble by a degree modified by lactone compounds, and owing to possessing both properties in PVA and lactones.Furthermore, the lactone-modified polyvinyl alcohol has a property as plasticizers or softening agents, as a result, there can be provided a polymer composition having an excellent property by mixing with hydrophilic polymer or polar polymer.