Thermally reversible crosslinked matter and its use

A thermally reversible crosslinked matter, comprising:

• a) a compound (A)-based moiety and a compound (B)-based moiety, wherein both moieties are bonded to each other through a crosslinked structure;
• b) wherein the crosslinked structure comprises a structure making steric hindrance;
• c) wherein the crosslinked structure breaks due to heating and then reverts due to cooling;
• d) wherein, when the crosslinked structure and thermally reversible crosslinked matter are heated at the same temperature and when the crosslinked structure breaks due to heating, the melt viscosity of the thermally reversible crosslinked matter decreases to not higher than twice the melt viscosity of compound (A) alone or the melt viscosity of compound (B) alone, whichever is higher;
• and
• e) wherein the structure making steric hindrance is a hindered amine, and wherein the hindered amine is an aliphatic cyclic amine.

A thermally reversible crosslinked matter, comprising:

• a) a compound (A)-based moiety and a compound (B)-based moiety, wherein both moieties are bonded to each other through a crosslinked structure;
• b) wherein the crosslinked structure comprises a structure making steric hindrance;
• c) wherein the crosslinked structure breaks due to heating and then reverts due to cooling;
• d) wherein, when the crosslinked structure and thermally reversible crosslinked matter are heated at the same temperature and when the crosslinked structure breaks due to heating, the melt viscosity of the thermally reversible crosslinked matter decreases to not higher than twice the melt viscosity of compound (A) alone or the melt viscosity of compound (B) alone, whichever is higher;
• and
• e) wherein the thermally reversible crosslinked matter is obtained by reacting the compound (A)-based moiety and the compound (B)-based moiety with each other in the temperature range of 100 to 250° C.