Abstract: An ink composition for an aqueous ink ball point pen with which a sufficiently high line intensity is obtained even when a thermochromic microcapsule pigment having a small average particle diameter is used and which is excellent in storage stability and a writing performance is provided with such a constitution that it contains at least a microcapsule pigment which has an average particle diameter of 0.1 to 1.0 ?m and in which a wall film is formed by an amino resin and a chemical substance which is a polymer comprising ketone as a main chain and has an acidic functional group in the chemical structure and which has an acid value of 3 to 40 (mgKOH/g).

Abstract: In order to provide an ink composition for an aqueous ink ball point pen with which a sufficiently high line intensity is obtained even when a thermochromic microcapsule pigment having a small average particle diameter is used and which is excellent in storage stability and a writing performance and an aqueous ink ball point pen, a composition of the above ink composition for an aqueous ink ball point pen is provided with such a constitution that it contains at least a microcapsule pigment which has an average particle diameter of 0.1 to 1.0 ?m and in which a wall film is formed by an amino resin and a chemical substance which is a polymer comprising ketone as a main chain and has an acidic functional group in the chemical structure and which has an acid value of 3 to 40 (mgKOH/g).

Abstract: A refill for an oil-based ink ballpoint pen which inhibits starving at the beginning of writing and protects a pen point and which inhibits an ink solvent from absorbing moisture from the outside and volatilizing with the passage of time and is excellent in making writing feeling soft and smooth. The refill for an oil-based ink ballpoint pen includes a volatilization-inhibiting seal member, for example, a sealing coat prepared by melting and solidifying an olefin base thermoplastic sticking agent is formed at the point part a tip of a refill for an oil-based ink ballpoint pen charged with a volatile oil-based ink having a specific physical property. The refill can be charged into a defined oil-based ink ballpoint pen.

Abstract: A refill for an oil-based ink ballpoint pen which inhibits starving at the beginning of writing and protects a pen point and which inhibits an ink solvent from absorbing moisture from the outside and volatilizing with the passage of time and is excellent in making writing feeling soft and smooth. The refill for an oil-based ink ballpoint pen includes a volatilization-inhibiting seal member, for example, a sealing coat prepared by melting and solidifying an olefin base thermoplastic sticking agent is formed at the point part a tip of a refill for an oil-based ink ballpoint pen charged with a volatile oil-based ink having a specific physical property. The refill can be charged into a defined oil-based ink ballpoint pen.

Abstract: A process for producing 1H-3-aminopyrrolidine and derivatives thereof is disclosed.

Abstract: .alpha.-Hydroperoxyisopropylphenyl compounds are useful as an organic hydroxyperoxide content in test compositions for the measurement of peroxide-active substances and are effectively utilized for detecting peroxide-active substances such as blood or hemoglobin (occult blood).Test devices for the detection of occult blood are constituted of a carrier in which organic hydroperoxide, coloration indicator, buffering agent, wetting agent, activating agent and stabilizer are impregnated. If hemoglobin is present in a specimen, the organic hydroperoxide is activated to produce nascent oxygen with which the indicator is oxidized and develops color.