Abstract:
PROBLEM TO BE SOLVED: To provide a key holder which facilitates attachment/detachment of the key relative to a key holder body.SOLUTION: The key holder includes: the key holder body 1 comprising a pair of side plates 2 opposite to each other; a plurality of guide grooves 2a, 2b which are formed so as to be in mirror symmetry to the key rotation center O2 at a plurality positions set between the side plates and to the opposite faces of the side plates and are inclined to the center line connected to the key rotation center at a specified angle, with their one end reaching the vicinity of the key rotation center and with the other end communicated with insertion holes 2d each opened on both side faces of the side plates; and a key fitting pin 4 wherein a mover 4c provided at both ends of the side plates is inserted from an insertion hole into the guide groove to retain each side plate connected, and the plurality of keys 3 are detachably fitted thereto, to store the keys between the side plates. This dispenses with a tool when increasing/decreasing the key, facilitating an increase/decrease operation of the key.
Abstract:
PROBLEM TO BE SOLVED: To provide a leather tanning agent which is safe in terms of environmental pollution and industrial hygiene, does not generate formaldehyde as compared with conventional phosphorus-based leather tanning agents and is excellent in leather tanning effect, and to provide a method for tanning leather. SOLUTION: The leather tanning agent comprises an effective amount of a phosphonium salt represented by general formula (1), which is preferably a product obtained by the reaction of tris(hydroxypropyl)phosphine represented by general formula (2) with an acid. X in general formula (1) is preferably an anion of an acid residue. COPYRIGHT: (C)2006,JPO&NCIPI