Abstract: A method of treating waste product containing flexible polyurethane resin includes adding a decomposing agent to the waste product to start a decomposition reaction; and terminating the decomposition reaction at a stage in which a diamine concentration derived from an isocyanate raw material of the flexible polyurethane resin is 2 wt % or lower to obtain a pasty intermediate product.

Abstract: A method of decomposing a thermosetting resin by a decomposer comprising the steps of: pre-heating the thermosetting resin up to a pre-heating temperature T0; kneading the pre-heated thermosetting resin together with a decomposer, and concurrently heating a mixture comprising the thermosetting resin and the decomposer up to a kneading temperature T1, thereby allowing a reaction to take place between the decomposer and the thermosetting resin to obtain a kneaded matter wherein the decomposer becomes consumed; and heating the kneaded matter to a maximum temperature T2 to thereby decompose the thermosetting resin; wherein the preheating temperature T0 is not higher than the boiling temperature of the decomposer; the kneading temperature T1 is not lower than the pre-heating temperature T0 but is lower than the thermal decomposition temperature of the thermosetting resin; the maximum temperature T2 is lower than the decomposition temperature of the thermosetting resin; and the pre-heating of the thermosetting resi

Abstract: A method of treating waste product containing flexible polyurethane resin includes adding a decomposing agent to the waste product to start a decomposition reaction; and terminating the decomposition reaction at a stage in which a diamine concentration derived from an isocyanate raw material of the flexible polyurethane resin is 2 wt % or lower to obtain a pasty intermediate product.

Abstract: The invention relates to a resin composition that has, as a raw material, a product that is obtained by addition reacting a compound having a unsaturated carbon bond to a resin decomposed product obtained by chemically decomposing a urethane resin, alternatively, by decomposing a urethane resin with a compound having a unsaturated carbon bond. The resin composition can be solidified by polymerization by use of a cross-linking agent and an addition polymerization initiator. Furthermore, when a compound having two or more carboxyl groups or an anhydride thereof is blended together with the urethane resin decomposition, a resin composition can be obtained. When the resin composition obtained thereby is cured, a recycled resin with excellent properties can be obtained.

Abstract: A novel method for decomposing urethane resin suppresses the generation of aromatic amines and facilitates the recycling of urethane resins. To decompose urethane resin, the method involves the use of a decomposing agent that has both an ability to cleave urethane bonds in a urethane resin and an ability to react with and thus capture an amine compound. The decomposing agent is preferably one that contains either at least one selected from carboxyl group, and a salt, ester and acid anhydride thereof, or at least one selected from isocyanate group and epoxy group.

Abstract: Disclosed is a method of adding a compound having at least one group selected from the group consisting of a carboxyl group, salts thereof, esters thereof and haloformyl groups or an acid anhydride, as a treating agent, to a resin decomposed substance prepared by decomposing a urethane bond of a urethane resin, and adding an epoxy resin or isocyanate compound to the product, to regenerate the resin. According to the present invention, reaction activity in producing a regenerated resin from a urethane resin decomposed substance is appropriately suppressed, and thus regeneration of a urethane resin can be carried out by easy procedures.

Abstract: A method of decomposing a thermosetting resin by a decomposer comprising the steps of: pre-heating the thermosetting resin up to a pre-heating temperature T0; kneading the pre-heated thermosetting resin together with a decomposer, and concurrently heating a mixture comprising the thermosetting resin and the decomposer up to a kneading temperature T1, thereby allowing a reaction to take place between the decomposer and the thermosetting resin to obtain a kneaded matter wherein the decomposer becomes consumed; and heating the kneaded matter to a maximum temperature T2 to thereby decompose the thermosetting resin; wherein the preheating temperature T0 is not higher than the boiling temperature of the decomposer; the kneading temperature T1 is not lower than the pre-heating temperature T0 but is lower than the thermal decomposition temperature of the thermosetting resin; the maximum temperature T2 is lower than the decomposition temperature of the thermosetting resin; and the pre-heating of the thermosetting resi