A polylactic acid resin composition of the present invention is constructed by dynamically cross-linking a resin mixture containing a polylactic acid-based resin, trans-polyisoprene, and a cross-linking agent. The resin composition can be used for a wide variety of applications such as automobile molded articles, molded articles for electric products, molded articles for agricultural materials, molded articles for business use, and molded articles for daily use.

A golf ball includes a main body and a paint layer positioned outside the main body. The paint layer includes an inner layer and an outer layer positioned outside the inner layer. When an indentation depth (nm) is measured on a cross-section along a plane passing through a central point of the golf ball when a force of 30 mgf is applied to the cross-section in a direction perpendicular to the cross-section, an indentation depth Di on a cross-section of the inner layer is smaller than an indentation depth Do on a cross-section of the outer layer. A thickness To of the outer layer is larger than a thickness Ti of the inner layer.

Disclosed is a packaging film composition recyclable and excellent in adhesiveness, and more particularly to a packaging film composition recyclable and excellent in adhesiveness that is composed of a PET copolymer to secure high adhesiveness and become recyclable, enhancing thermal adhesion and printability of PE- or PP-based films and improving the reprocessability to increase the potential of recycling and to reduce the environmental contaminations caused by the increasing waste plastics.

The packaging film composition recyclable and excellent in adhesiveness is prepared by mixing 100 parts by weight of a PET copolymer, 5 to 120 parts by weight of an ecofriendly plasticizer; 5 to 100 parts by weight of acryl rubber or an acryl-based copolymer and butadiene rubber or a butadiene-based copolymer; and 5 to 150 parts by weight of a thermoplastic polyester elastomer (TPEE) and can be processed by any one method of injection, extrusion, and calendering.

A dip-forming synthetic isoprene polymer latex contains a synthetic isoprene polymer which has been subjected to solution polymerization using an alkyllithium polymerization catalyst. A ratio between a mode diameter and a median diameter (mode diameter/median diameter) of a particle diameter of the latex is 0.8 or more. A Brookfield viscosity difference (V.sub.66V.sub.56) between a Brookfield viscosity at a solid content concentration of 56% (V.sub.56) and a Brookfield viscosity at a solid content concentration of 66% (V.sub.66) is 200 mPa.Math.s or less.

Provided are reinforcing fibers using an adhesive component not containing resorcinol and formaldehyde, which are excellent in adhesiveness to rubber and which can be efficiently produced while preventing contamination of production facilities, and a method for producing them, as well as a molded article using them. The reinforcing fibers have an adhesive component that contains a conjugated diene rubber and an oil, in at least a part of the surfaces thereof, wherein the vapor pressure at 20 C. of the oil is 10 Pa or less.

The invention relates to a rubber composition based on at least one diene elastomer, a reinforcing filler including at least carbon black, having a specific surface area CTAB greater than or equal to 130 m.sup.2/g, a plasticizing hydrocarbon resin, the vitreous transition temperature of which, Tg, is greater than 20 C., and the softening point of which is less than 170 C., and a cross linking system, the dispersion of the filler in the elastomeric matrix having a Z score greater than or equal to 70.

A method of recycling rubber includes pre-treating vulcanized ground rubber to prevent the vulcanized ground rubber from encountering significant additional crosslinking during co-vulcanization with fresh rubber compound, and promoting better bonding between the vulcanized ground rubber and the fresh rubber compound. The ground vulcanized rubber can be coated with a layer of non-vulcanized rubber that includes cure inhibitors or other ingredients dispersed within the layer to aid in the coating process and/or co-vulcanization of the vulcanized ground rubber and fresh rubber compound. The vulcanized ground rubber can also be pre-treated with a mixture of at least one chemical curing agent inhibitor and a solvent capable of solubilizing the chemical curing agent inhibitor and dispersing the curing agent inhibitor within the vulcanized ground rubber.

Crumb rubber obtained from recycled tires is subjected to an interlinked substitution process. The process utilizes a reactive component that interferes with sulfur bonds. The resulting treated rubber exhibits properties similar to those of the virgin composite rubber structure prior to being granulated, and is suitable for use in fabricating new tires, engineered rubber articles, and asphalt rubber for use in waterproofing and paving applications.

Method of making a golf ball, the golf ball comprising a core, an outer layer and at least one adhesion promoting coating disposed between each of the core and the outer layer; the core comprising a rubber composition comprising at least one zinc-containing and/or magnesium-containing component; the outer layer comprising at least one ionomer; and the adhesion promoting coating comprising a waterborne dispersion comprised of at least one ethylene acid copolymer having an acid content of at least 15% by weight wherein the copolymer is at least partially neutralized with one or more neutralizing agent; wherein at least one neutralizing agent is selected from ammonia compounds and/or amine compounds. In a specific embodiment, the at least one neutralizing agent comprises i) mono and/or divalent metal compounds and ii) ammonia compounds and/or amine compounds.

A curable film and a cured product obtained by curing the curable film are disclosed. The curable film contains, as essential components, hollow glass microspheres and a rubber composition containing at least one diene-based rubber. The curable film is thin and has excellent processibilities. The cured product has desirable dielectric and thermomechanical characteristics that are suitable to be used as a dielectric material for printed circuit boards, especially for multilayer printed circuit boards and high-density interconnect printed circuit boards.