A magnetic button having a first button member incorporating a magnet and a second button member incorporating a body made of ferromagnetic material. The first button member and the second button member are magnetically couplable and uncouplable by moving towards and away from each other, respectively, in a coupling direction. The permanent magnet is annular, and a central body made of ferromagnetic material is arranged in a cavity of the permanent annular magnet.

A magnetic button having a first button member incorporating a magnet and a second button member incorporating a body made of ferromagnetic material. The first button member and the second button member are magnetically couplable and uncouplable by moving towards and away from each other, respectively, in a coupling direction. The permanent magnet is annular, and a central body made of ferromagnetic material is arranged in a cavity of the permanent annular magnet.

Provided is a polyamide elastomer composition having excellent stability in various molding and excellent dyeing properties as well as excellent color fastness properties. A polyamide elastomer composition which comprises a polyamide elastomer and a phosphorous acid compound, wherein the polyamide elastomer comprises constituent units 1 derived from a diamine compound represented by the formula (1) below, constituent units 2 derived from an aminocarboxylic acid compound represented by the formula (2) below or a lactam compound represented by the formula (3) below, and constituent units 3 derived from a dicarboxylic acid compound represented by the formula (4) below, wherein the content of the phosphorous acid compound in the polyamide elastomer is 0.02 to 0.15% by mass, and wherein the polyamide elastomer has a terminal amino group concentration of 2.010.sup.5 eq/g or more (x represents an integer of 1 to 20, y represents an integer of 4 to 50, z represents an integer of 1 to 20, R.sup.1 represents a linking group comprising a hydrocarbon chain, R.sup.2 represents a linking group comprising a hydrocarbon chain, R.sup.3 represents a linking group comprising a hydrocarbon chain, and m represents 0 or 1).

Provided is a polyamide elastomer composition having excellent stability in various molding and excellent dyeing properties as well as excellent color fastness properties. A polyamide elastomer composition which comprises a polyamide elastomer and a phosphorous acid compound, wherein the polyamide elastomer comprises constituent units 1 derived from a diamine compound represented by the formula (1) below, constituent units 2 derived from an aminocarboxylic acid compound represented by the formula (2) below or a lactam compound represented by the formula (3) below, and constituent units 3 derived from a dicarboxylic acid compound represented by the formula (4) below, wherein the content of the phosphorous acid compound in the polyamide elastomer is 0.02 to 0.15% by mass, and wherein the polyamide elastomer has a terminal amino group concentration of 2.010.sup.5 eq/g or more (x represents an integer of 1 to 20, y represents an integer of 4 to 50, z represents an integer of 1 to 20, R.sup.1 represents a linking group comprising a hydrocarbon chain, R.sup.2 represents a linking group comprising a hydrocarbon chain, R.sup.3 represents a linking group comprising a hydrocarbon chain, and m represents 0 or 1).

A monitor device is provided for monitoring the closed or open state of an article, the monitor device being an electronic circuit having a first closure system having first and second electrically conductive elements that are electrically connectable and disconnectable relative to each other. The first element has a hollow body; and an electrical power supply housed in the hollow body. A second closure system has a first terminal and a second terminal. The monitor device also has a detector-and-signaling device having both a detector module configured to be powered by the power supply when the first closure system is in the closed state and to detect the open or closed state of the second closure system. A signaling module is configured to issue a signal as a function of the open or closed state of the second closure system as detected by the detector module.

A monitor device is provided for monitoring the closed or open state of an article, the monitor device being an electronic circuit having a first closure system having first and second electrically conductive elements that are electrically connectable and disconnectable relative to each other. The first element has a hollow body; and an electrical power supply housed in the hollow body. A second closure system has a first terminal and a second terminal. The monitor device also has a detector-and-signaling device having both a detector module configured to be powered by the power supply when the first closure system is in the closed state and to detect the open or closed state of the second closure system. A signaling module is configured to issue a signal as a function of the open or closed state of the second closure system as detected by the detector module.

There is provided a cap, which is one part of a button fastener. The cap comprises a bottom and a circumferential side rising from an edge of the bottom. The cap is composed of an inner layer made of aluminum or aluminum alloy as a first material and an outer layer made of copper or copper alloy as a second material. The first and second layer are laminated on each other continuously across the bottom and the circumferential side. A Vickers hardness of the second material may be harder than a Vickers hardness of the first material. A tensile strength of the first material may be less than 260 N/mm2, and a tensile strength of the second material may be equal to or higher than 260 N/mm2.

There is provided a cap, which is one part of a button fastener. The cap comprises a bottom and a circumferential side rising from an edge of the bottom. The cap is composed of an inner layer made of aluminum or aluminum alloy as a first material and an outer layer made of copper or copper alloy as a second material. The first and second layer are laminated on each other continuously across the bottom and the circumferential side. A Vickers hardness of the second material may be harder than a Vickers hardness of the first material. A tensile strength of the first material may be less than 260 N/mm2, and a tensile strength of the second material may be equal to or higher than 260 N/mm2.

A clasp assembly is provided. The clasp assembly includes a first clasp member, a second clasp member, a first magnet, and a metallic component. The first clasp member defines a first cavity sized to receive a first portion of a zipper, and defines a first portion extending over the first cavity. The second clasp member defines a second cavity sized to receive a second portion of the zipper, and defines an overhang. The first magnet is secured to one of the first portion of the first clasp member and the overhang of the second clasp member. The metallic component is secured to another of the first portion of the first clasp member and the overhang of the second clasp member. The overhang is sized to receive the first portion of the first member to align the first magnet and the metallic component for magnetic interaction therebetween.

A clasp assembly is provided. The clasp assembly includes a first clasp member, a second clasp member, a first magnet, and a metallic component. The first clasp member defines a first cavity sized to receive a first portion of a zipper, and defines a first portion extending over the first cavity. The second clasp member defines a second cavity sized to receive a second portion of the zipper, and defines an overhang. The first magnet is secured to one of the first portion of the first clasp member and the overhang of the second clasp member. The metallic component is secured to another of the first portion of the first clasp member and the overhang of the second clasp member. The overhang is sized to receive the first portion of the first member to align the first magnet and the metallic component for magnetic interaction therebetween.