An acrylic rubber that is a copolymer in which 1 to 3 wt. % of a fumaric acid monoalkyl ester monomer containing an alkyl group having 1 to 8 carbon atoms is copolymerized as a crosslinkable comonomer, wherein 45 to 65 wt. % of n-butyl acrylate, 12 to 32 wt. % of 2-methoxyethyl acrylate, and 11 to 30 wt. % of ethoxyethoxyethyl acrylate are copolymerized in 100 wt. % of comonomers other than the crosslinkable comonomer. This acrylic rubber can suppress the reduction of oil resistance while improving cold resistance represented by a TR-10 value.

Methods, compositions, apparatuses, and systems are provided for a hybrid thermoplastic gel or sealant. The methods comprise providing (a) a base polymer having at least one functional group capable of crosslinking, (b) a functionalized extender, and (c) heat, and reacting the base polymer and functionalized extender in the presence of the heat to form the hybrid thermoplastic gel. The gel composition may comprise 5-40 wt % of a base polymer, 60-95 wt % of a functionalized extender, and 0-10 wt % of a crosslinker. A closure or interconnect system may comprise a housing, a cable, and a hybrid thermoplastic gel or sealant. A telecommunications apparatus may comprise a telecommunications component and a sealant that forms a seal with the telecommunications component. The sealant may comprise a sealant material having a first range of elongation followed by a second range of elongation.

The invention relates in particular to a crosslinkable rubber composition and to a process for preparing same.

The composition is based on an elastomer, comprises a crosslinking system and a thermoplastic phase with melting point Tm dispersed as nodules, and comprises the product: a) of a melt reaction by thermomechanical working of the elastomer and other ingredients, apart from the system, then b) of mechanical working with prior addition of the system.

According to the invention: the dimension of the nodules is between 10 nm and 10 pm, a) comprises heating the mixture up to a temperature >Tm maintained for a holding time, and the system comprises sulfur when the elastomer is unsaturated and said phase comprises saturated chains, and comprises a peroxide when the elastomer is saturated.

An acrylic rubber composition that includes a blend product of an acrylic rubber [I] containing a copolymer of an ethyl acrylate/n-butyl acrylate/2-methoxyethyl acrylate/carboxyl group-containing vinyl monomer, and an acrylic rubber [II] containing a copolymer of an alkoxyalkyl acrylate/2-ethylhexyl acrylate/alkyl methacrylate/ethyl acrylate/carboxyl group-containing vinyl monomer; the blend product being compounded with silica and a plasticizer.

An aspect of the present invention is an acrylic rubber containing only an alkyl acrylate, ethylene and a crosslinking monomer as monomer units, wherein a content of a polyvinyl alcohol in the acrylic rubber is 0.5 to 2% by mass.

A hot-melt composition includes, with respect to 100 parts by mass of (A) a hydrogenated styrene thermoplastic elastomer having styrene-based polymer blocks at both ends and a hydrogenated diene polymer block at a middle portion and having a mass-average molecular weight of 250,000-600,000, 20-150 parts by mass of (B) a first styrene-based tackifying resin having a softening point of 135-160° C., 100-400 parts by mass of (C) a second styrene-based tackifying resin having a softening point of 105-135° C., 100-500 parts by mass of (D) a third tackifying resin for the hydrogenated diene polymer block having a softening point of 100-160° C. and 500-1,500 parts by mass of (E) a liquid softener. The hot-melt composition has excellent adhesion and easy peel ability, and is a material suitable as a sealing material for a lighting device of an automobile or the like.

A thermoplastic composition including a thermoplastic polymer component and at least one elastomer, wherein the thermoplastic polymer component comprises at least one propylene copolymer having a propylene content of at least 60 wt.-% and at least one ethylene copolymer having an ethylene content of at least 50 wt.-%. The invention is also directed to a sealing device comprising a waterproofing layer obtained by using the thermoplastic composition, to a method for producing a sealing device, to a method for waterproofing a substrate, and to a method for bonding a first substrate to a second substrate.

The object of the present invention is to provide a tire sealant and tire repair kit having excellent injectability. The present invention is a tire sealant containing a natural rubber latex, a synthetic resin emulsion, an anti-freezing agent, and at least one type of substance selected from the group consisting of a compound A represented by the following formula (1) and an anti-desiccant, a content of the substance being 0.3 to 10 mass %; and a tire repair kit using the same. ##STR00001## In formula (1), R.sup.1 is an amino group, a hydrogen atom, or a hydrocarbon group; and R.sup.2 and R.sup.3 are each independently a hydrocarbon group optionally comprising a heteroatom, or a hydrogen atom.

A sealing body is for dynamic applications. The sealing body includes an elastomer material including epichlorohydrin rubber (ECO) as a rubber; and carbon nanotubes distributed in the elastomer material in an amount in a range from 0.4 to 10 phr, based on 100 parts by weight of rubber. The body has a Shore A hardness of in a range from 60 to 100.

One aspect of the present invention is a hot melt composition including a modified thermoplastic polymer having an alkoxysilyl group in a molecule; a softener; and a catalyst.