Noncovalent soft elastomer and method for manufacturing the same

A noncovalent elastomer composition comprising:

• a block copolymer having:
• an A block that is a polymer having a glass transition temperature (Tg) of 35° C. or higher and comprises at least one selected from the group consisting of polystyrenes, polyacrylic acid esters, polymethacrylic acid esters, and polyolefins;
• a B block comprising:
• (i) at least one selected from the group consisting of polyvinylpyridines, poly(meth)acrylic acids, polyacrylamides, and polyhydroxyalkyl (meth)acrylates, or
• (ii) at least one selected from the group consisting of polystyrene derivatives, polydiene derivatives, and polyolefin derivatives, into which a functional group has been introduced, the functional group being capable of non-covalent bonding selected from hydrogen bonding, coordination bonding, and ionic bonding;
• and
• a solvent having a vapor pressure of 1 mmHg or less and having a property of dissolving the B block but not dissolving the A block, wherein the solvent is an alcohol-based solvent selected from the group consisting of (i) glycol-based solvents selected from trimers to tricontamers of alkylene glycol, and (ii) non-glycol-based solvents selected from monoalcohol-based solvents, diol-based solvents, and polyol-based solvents,
• wherein a strip specimen formed of the noncovalent elastomer composition, and having a thickness of 0.6 mm and a width of 4 mm, has a stress at 300% elongation in the range of from 0.044 MPa to 1.42 MPa.