JP-7857049-B2 - gloves

Inventors

• 岸原 英敏

Assignees

• ショーワグローブ株式会社

Dates

Publication Date

20260512

Application Date

20250204

Claims (3)

1. It comprises a conductive portion that is exposed on the palmar outer surface of at least the second finger region and is composed solely of a coating , The conductive part described above is mainly composed of rubber and has carbon black added to it. The amount of carbon black added to 100 parts by mass of the above rubber is 0.6 parts by mass or more and 9.5 parts by mass or less. The DBP oil absorption capacity of the above carbon black is 250 ml/100g or more and 600 ml/100g or less. The volatile content of the above carbon black is 0.3% by mass or more and less than 1.0% by mass. Gloves having a volume resistivity of the conductive part described above of 10³ Ω or more and 10⁸ Ω or less.
2. The surface resistance value of the conductive part is 10 3 Ω or more 10 8 The glove according to claim 1, wherein the Ω value is less than or equal to Ω.
3. The glove according to claim 1 or claim 2, wherein the average thickness of the conductive portion is 0.06 mm or more and 0.4 mm or less.

Description

This invention relates to rubber latex compounds, a method for manufacturing gloves, and gloves themselves. In recent years, the number of devices operated via touch panels has increased, both for home and industrial use. Capacitive touch panels are the most common type. Capacitive touch panels operate through capacitive coupling, which occurs when electric charge transfers between the human body (e.g., fingertips) and the touch panel. Therefore, wearing gloves, for example, can weaken this capacitive coupling, potentially reducing the responsiveness of the touch panel. To avoid reducing the responsiveness of the touch panel, it is necessary to impart conductivity to the glove, thereby altering the capacitance, electric field, magnetic field, etc., of the touch panel that is in close proximity to or in contact with the glove, and allowing it to detect the touch position. A known example of a conductive glove is one made by heat-molding a rubber latex compound containing acid-treated carbon black (see Japanese Patent Publication No. 2003-321581). When carbon black is added in large quantities, the glove coating tends to harden. This hardening reduces the flexibility of the glove, leading to problems with workability, such as difficulty gripping objects. In this rubber latex compound, acid-treated carbon black is used to suppress the aggregation and gelation of the carbon black in the compound, enabling low resistance with relatively small amounts of carbon black. Japanese Patent Publication No. 2003-321581 Figure 1 is a flowchart showing a method for manufacturing gloves according to one embodiment of the present invention.Figure 2 is a schematic perspective view of a glove according to one embodiment of the present invention, as seen from the palm side.Figure 3 is a schematic perspective view of the glove shown in Figure 2, viewed from the back of the hand.Figure 4 is a schematic front view of a glove different from the one shown in Figure 2, viewed from the palm side. The following describes in detail a rubber latex compound, a method for manufacturing gloves, and gloves according to one embodiment of the present invention. [Rubber latex-containing products] A rubber latex compound according to one aspect of the present invention is a rubber latex compound for gloves, with rubber latex as the main component. This rubber latex compound contains carbon black, an anionic surfactant, a nonionic dispersant, and a water-soluble polymer. <Rubber latex> The above rubber latex is a homopolymer, copolymer, or carboxy-modified polymer thereof of acrylonitrile butadiene rubber (NBR), acrylic rubber, urethane rubber, natural rubber (NR), isoprene rubber, chloroprene rubber, etc., either alone or as a blend of several. The above rubber latex is more stable with the carbon black in the formulation when it has a higher gel content. The gel content decreases when the polymer chain of the rubber latex has fewer branches, and increases when it has more branches. In the case of NBR, the gel content of the rubber latex can be evaluated as the MEK insoluble fraction. The lower limit of the MEK insoluble fraction of the rubber latex is preferably 10% by mass, more preferably 20% by mass, and even more preferably 30% by mass. On the other hand, the upper limit of the MEK insoluble fraction of the rubber latex is preferably 80% by mass, more preferably 75% by mass, and even more preferably 73% by mass. If the MEK insoluble fraction of the rubber latex is below the lower limit, the stability of the carbon black in the rubber latex formulation may decrease. Conversely, if the MEK insoluble fraction of the rubber latex exceeds the upper limit, the film-forming ability of the rubber latex formulation may decrease. Similarly, in the case of NR, it can be evaluated as the toluene-free fraction, and a lower limit of 50% is preferred for the toluene-free fraction. The upper limit of the toluene-insoluble fraction is not particularly limited, but 90% is preferred, and 85% is more preferred. Here, the MEK insoluble fraction can be measured by the following method. First, the rubber latex is diluted with deionized water so that the total solid content is 30% by mass. 5 g of this diluted latex is weighed into a glass petri dish with an inner diameter of 10 cm, and dried in an oven at 30°C for 15 hours to remove moisture, thereby obtaining a film with an average thickness of approximately 0.05 mm. The above film is cut into test pieces of approximately 5 mm square, and after weighing out a test piece with a mass of approximately 0.2 g, its mass is measured to four significant figures (this mass is denoted as W [g]). This test piece is placed in a #80 metal mesh basket (base approximately 2 cm square, approximately 9 g) whose mass has been measured in advance. Next, the basket containing the test piece is immersed in 100 ml of methyl ethyl ketone (MEK) and left to stand for 24 hours at a temperature between 23°C and 25°C. After standing, the ba