Solvent-free crosslinked polyrotaxane material and process for production of same

A material comprising a first polyrotaxane and a second polyrotaxane,

• wherein the first polyrotaxane comprises a first pseudopolyrotaxane, which has a first linear molecule and a first cyclic molecule(s) in which the first linear molecule is included in a cavity (cavities) of the first cyclic molecule(s) in a skewered manner, and first capping groups, each of which locates at each end of the first pseudopolyrotaxane in order to prevent the dissociation of the first cyclic molecule(s),
• the second polyrotaxane comprises a second pseudopolyrotaxane, which has a second linear molecule and a second cyclic molecule(s) in which the second linear molecule is included in a cavity (cavities) of the second cyclic molecule(s) in a skewered manner, and second capping groups, each of which locates at each end of the second pseudopolyrotaxane in order to prevent the dissociation of the second cyclic molecule(s),
• the first and second linear molecules are polyethylene glycol,
• the first and second polyrotaxanes are crosslinked with each other via the first and second cyclic molecules,
• each of the first and second cyclic molecules has a first active group and a second active group, respectively,
• the crosslinked body has a crosslinking moiety which is bound to the first cyclic molecule and the second cyclic molecule,
• the crosslinking moiety has a first reactive group and a second reactive group, each of which is reactive with the first active group and the second active group, respectively, and
• the crosslinking moiety has a polymeric moiety between the first and second reactive groups,
• the reactive group is selected from the group consisting of an isocyanate group, a thioisocyanate group, an oxirane group, an oxetane group, a carbodiimide group, a silanol group, an oxazoline group, and an aziridine group,
• the polymeric moiety comprises repeating units of 10 or more and/or has molecular weight of 1,000 or more,
• the material is free from solvent, and
• the material has a stress at 50% strain (δ50) of 2.0 MPa or less.