Abstract:
An object of the present invention is to provide a foam having reduced hardness and density, and an improved resistance to compression set, as well as a foam composition for producing such a foam. This object is achieved by a foam composition described below. The foam composition of the present invention comprises a thermoplastic elastomer which has a side chain containing imino group and/or a nitrogen-containing heterocycle, and a carbonyl-containing group; and a blowing agent.
Abstract:
A thermoplastic elastomer obtained by reacting an elastomeric polymer containing a cyclic acid anhydride group in its side chain and a polyamine compound having two or more primary amino groups, and a thermoplastic elastomer composition containing the thermoplastic elastomer are provided. The thermoplastic elastomer exhibits excellent physical properties such as mechanical strength and in particular tensile strength while retaining its excellent recyclability.
Abstract:
A composition useful as a sealant, coating, a potting agent for a printed circuit board, a prepreg or an adhesive comprises a compound (A) wherein all or a part of the oxirane rings in an epoxy compound is replaced with thiirane rings represented by the following formula (1): or compound (A) and compound (B) which contains oxirane rings and no thiirane ring in the molecule, wherein the ratio of oxirane ring/thiirane ring is from 90/10 to 10/90.
Abstract:
An elastomer composition including an elastomer having a functional group, and a compound having a functional group, in which corresponding functional groups form a cross-link by at least one of an ionic bond, a hydrogen bond, and Diels-Alder reaction with temperatures, i.e., by heating, while the cross-link is cleaved at around room temperature, forming and cleaving of the cross-link being reversible.
Abstract:
A rubber composition containing 50 to 90 parts by weight of a diene rubber and 50 to 10 parts by weight of a gelled rubber having a toluene swelling index of 16 to 150, based upon the total amount of 100 parts by weight of the diene rubber and the gelled rubber.
Abstract:
A tire-wheel assembly and disassembly method is disclosed wherein relative shifting of a tire and a wheel when braking and/or cornering can be suppressed without negatively affecting tire replacement workability. Specifically, a tire-wheel assembly has a wheel constructed from an electrically conductive material and a tire assembled on an outer peripheral side of the wheel, wherein an electrically conductive layer is formed on at least a part of a wheel contact surface of the tire, and an electrically debonding adhesive comprising an ionic liquid is interposed between the electrically conductive layer of the tire and the wheel. When disassembling this tire-wheel assembly, the tire is removed from the wheel after voltage is applied between the wheel and the electrically conductive layer of the tire and electricity is passed through the electrically debonding adhesive.
Abstract:
A thermoplastic elastomer having a side chain having a moiety crosslinkable by hydrogen bond containing a carbonyl-containing group and a nitrogen-containing heterocycle, and another side chain having a covalently crosslinkable moiety, the thermoplastic elastomer being able to be crosslinked at the covalently crosslinkable moiety by at least one bond selected from the group consisting of amide, ester, lactone, urethane, ether, thiourethane, and thioether. The thermoplastic elastomer exhibits excellent mechanical strength without detracting from its excellent recycleability.
Abstract:
An object of the present invention is to provide a method of adhering a vulcanized rubber composition using a thermoplastic elastomer composition capable of maintaining recycling property and excellent in adhesiveness. The above object is achieved by the following method of adhering a vulcanized rubber composition. A method of adhering a vulcanized rubber composition of the present invention is a method of adhering a vulcanized rubber composition using a thermoplastic elastomer composition. The thermoplastic elastomer composition contains a thermoplastic elastomer and a filler. The thermoplastic elastomer has: a monomer unit forming a rubber component of the vulcanized rubber composition on at least part of its main chain; and a side chain containing a structure represented by a predetermined structural formula, the structure having a carbonyl group and an imino group, and/or a nitrogen-containing heterocyclic ring. The method includes adhering a first member and a second member each composed of the vulcanized rubber composition through the thermoplastic elastomer composition.
Abstract:
The objects of the present invention are to provide thermoplastic elastomers which retain an excellent recyclability while also having an excellent mechanical strength, particularly an excellent compression set, and to provide thermoplastic elastomer compositions which include such thermoplastic elastomers. These objects are achieved by the thermoplastic elastomers and thermoplastic elastomer compositions described below. One thermoplastic elastomer of the present invention is a hydrogen-bondable thermoplastic elastomer composed of an elastomeric polymer having, on side chains, carbonyl-containing groups and imidazole rings, which rings bear a hydrogen atom on a nitrogen atom and also bear an alkyl, aralkyl or aryl group. Another thermoplastic elastomer of the present invention is a thermoplastic polymer having side chains of a given structural formula that contain a carbonyl group and an imino group. The inventive thermoplastic elastomer compositions are compositions which include such thermoplastic elastomers.
Abstract:
A thermoplastic polymer having a carbonyl-containing group and a nitrogen-containing 5-membered heterocycle-containing group in side chains, and a composition thereof. The thermoplastic polymer and composition thereof have excellent recycle property in that physical properties do not deteriorate even though formation of crosslinking and dissociation of crosslinking are repeatedly conducted with altering temperature. The thermoplastic polymer and composition thereof are that its crosslinked structure is considerably stable at room temperature, and therefore have considerably high tensile strength. In particular, in the case of bonding to a main chain at 3-position or 4-position of a nitrogen-containing 5-membered heterocycle, intermolecular hydrogen bond is caused, so that a cured product has high mechanical properties.