Provided is a rubber composition having coating film affinity, including the following component (A) as a main component, and the following components (B) and (C). Also provided is an external diaphragm for railroad cars, including a cross-linked product of the rubber composition having coating film affinity. The rubber composition having coating film affinity can exhibit excellent performance as a material for forming a rubber product (a rubber product, such as an external diaphragm for railroad cars) required to have coating film adhesion as well as rubber physical properties, such as tensile strength and breaking elongation, and durability. (A) An ethylene-propylene-diene rubber (EPDM) (B) A non-hydrogenated liquid butadiene rubber having a functional group capable of reacting with at least one selected from the group consisting of an isocyanate group and a hydroxy group (C) An organic peroxide cross-linking agent

A halogen-free low dielectric resin composition is provided. The halogen-free low dielectric resin composition comprises: (A) a resin system, which includes: (a1) a polyphenylene ether resin with unsaturated functional groups, and (a2) a polyfunctional vinyl aromatic copolymer; and (B) an allyl cyclophosphazene compound represented by the following formula (I):

##STR00001## in formula (I), t is an integer ranging from 1 to 6, wherein, the polyfunctional vinyl aromatic copolymer (a2) is prepared by copolymerizing one or more divinyl aromatic compounds and one or more monovinyl aromatic compounds.

There is disclosed an elastomeric styrenic block copolymer (SBC) composition comprising one or more SBCs and one or more polymers miscible with styrenic end blocks of the one or more SBCs; wherein said block copolymer composition is both physically and chemically crosslinked; wherein said chemical crosslinking comprises covalent bonds between chains of SBC and; wherein said physical crosslinking comprises non-covalent interaction between styrenic end blocks of the one or more SBCs and the one or more polymers miscible with the styrenic end blocks.

Also disclosed is a miscible polymer blend comprising one or more SBCs and one or more polymers miscible with styrenic end blocks of the one or more SBCs; wherein said miscible polymer blend is both physically and chemically crosslinked; wherein said chemical crosslinking comprises covalent bonds between chains of SBC and; wherein said physical crosslinking comprises non-covalent interaction between styrenic end blocks of the one or more SBCs and the one or more polymers miscible with the styrenic end blocks.

The herein disclosed unique compositions or blends comprising physically and chemically cross-linked styrene block copolymers find use in, for example, the manufacture of thin-walled dipped articles such as condoms or gloves. The unique compositions or blends overcome the shortcoming of chemical resistance in presently available SBCs while maintaining a high level of mechanical resistance and flexibility.

The pneumatic tire characterized by comprising the tread and the crosslinked rubber composition, of the present invention, wherein the tread and the crosslinked rubber composition comprise two or more kinds of rubber components and a filler and have a volume of the low density region of 35% or more, a volume of the void portion of 7.5 or less and a filler distribution D represented by the following formula (I) of 2.0 or less are excellent in abrasion resistance.
D=(A.sub.1/B.sub.1)/(A.sub.0/B.sub.0)(I) In the formula (I), A.sub.1 represents a volume fraction of a rubber component A in a filler gel, B.sub.1 represents a volume fraction of a rubber component B in a filler gel, A.sub.0 represents a volume fraction of a compounded rubber component A, B.sub.0 represents a volume fraction of a compounded rubber component B.

Disclosed are ethylenically unsaturated macromers produced using a residue of an isocyanate manufacturing process. Also disclosed are preformed stabilizers produced using such macromers, polymer polyols produced using such preformed stabilizers, foam-forming compositions produced using such polymer polyols, and foam produced using such compositions.

Disclosed are a coupling agent for a rubber composition and a rubber composition for a tire containing the same. The rubber composition according to the present disclosure contains a coupling agent that may induce interactions between a rubber as a raw material and carbon black, thereby improving dispersibility of the carbon black in the rubber composition. Thus, a tire with low rolling-resistance and excellent wear resistance may be realized.

Disclosed is a compound useful in a resin composition for fabricating articles such as a prepreg, a resin film, a laminate or a printed circuit board, such that the articles have improved one or more properties including glass transition temperature, ratio of thermal expansion, peel strength, thermal resistance, dielectric constant, dissipation factor and flame retardancy.

A modified diene elastomer is provided. The elastomer comprises: at least 70% by weight, with respect to the total weight of the modified diene elastomer, of a linear diene elastomer functionalized predominantly in the middle of the chain by an alkoxysilane group, optionally partially or completely hydrolysed to give silanol, the alkoxysilane group optionally bearing another functional group capable of interacting with a reinforcing filler, the alkoxysilane group bonded to the two branches of the diene elastomer via the silicon atom, the functionalized diene elastomer exhibiting a polydispersity index before fractionalization of less than or equal to 1.6; and more than 0 and up to 30% by weight, with respect to the total weight of the modified diene elastomer, of a star-branched diene elastomer exhibiting a polydispersity index before star-branching of less than or equal to 1.6, the Mooney viscosity of the modified diene elastomer varying from 30 to 80.

A pulley contacting portion of a friction transmission belt is made of a rubber composition containing an EPDM mixture as a rubber component. The EPDM mixture as the rubber component includes a first EPDM with an ethylene content of 67% by mass or more and a second EPDM with an ethylene content of 57% by mass or less. A content of the second EPDM in the EPDM mixture is larger than a content of the first EPDM in the EPDM mixture. An average ethylene content of the EPDM mixture is 54% by mass or more and 59% by mass or less.

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.