Structure material and molded product using the same and decomposing method thereof

A molded product formed of a structure material,

• wherein the structure material consisting essentially of 20 parts by weight or more of a polymer mixture on the basis of 100 parts by weight of the structure material, wherein the polymer mixture consists essentially of (A) a thermoplastic aromatic polyester;
• and (B) a thermoplastic aliphatic polyester, and a content of the thermoplastic aromatic polyester in the polymer mixture is larger than a content of the thermoplastic aliphatic polyester, and
• wherein the thermoplastic aromatic polyester is obtained by condensation-polymerizing at least one aromatic polybasic acid and at least one glycol, and the at least one aromatic polybasic acid is selected from the group consisting of phthalic anhydride, isophthalic acid, terephthalic acid, diphenyl carboxylic acid and combinations thereof, and the at least one glycol is selected from the group consisting of ethylene glycol, propylene glycol, diethlylene glycol, dipropylene glycol, neopentyl glycol, hexamethylene glycol, polyethylene glycol, butanediol and combinations thereof,
• wherein the thermoplastic aliphatic polyester is at least one selected from the group consisting of polycanrolactone, polycaprolactone diol, polycaprolactone triol, polyethylene succinate, polybutylene succinate and polylactic acid,
• wherein the polymer mixture comprises 3 to 40 parts by weight of the aliphatic polyester on the basis of 100 parts by weight of the polymer mixture, and
• wherein the polymer mixture can be decomposed into a monomer unit by a decomposing solution containing a base and a hydrophilic solvent.

A decomposing method for a structure material,

• wherein the structure material consisting essentially of 20 parts by weight or more of a polymer mixture on the basis of 100 parts by weight of the structure material, wherein the polymer mixture consists essentially of (A) a thermoplastic aromatic polyester;
• and (B) a thermoplastic aliphatic polyester, and a content of the thermoplastic aromatic polyester in the polymer mixture is larger than a content of the thermoplastic aliphatic polyester,
• wherein the thermoplastic aromatic polyester is obtained by condensation-polymerizing at least one aromatic polybasic acid and at least one glycol, and the at least one aromatic polybasic acid is selected from the group consisting of phthalic anhydride isophthalic acid terephthalic acid, diphenyl carboxylic acid and combinations thereof, and the at least one glycol is selected from the group consisting of ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, hexamethylene glycol, polyethylene glycol, butanediol and combinations thereof,
• wherein the thermoplastic aliphatic polyester is at least one selected from the group consisting of polycaprolactone, polycaprolactone diol, polycaprolactone triol, polyethylene succinate, polybutylene succinate and polylactic acid, and
• wherein the polymer mixture comprises 3 to 40 parts by weight of the aliphatic polyester on the basis of 100 parts by weight of the polymer mixture,
• the method comprising the step of immersing the structure material in a decomposing solution containing a base and a hydrophilic solvent at a temperature lower than the boiling point of the hydrophilic solvent.

A decomposing method for a molded product formed by molding a structure material together with at least a metal,

• wherein the structure material consisting essentially of 20 parts by weight or more of a polymer mixture on the basis of 100 parts by weight of the structure material, wherein the polymer mixture consists essentially of (A) a thermoplastic aromatic polyester;
• and (B) a thermoplastic aliphatic polyester, and a content of the thermoplastic aromatic polyester in the polymer mixture is larger than a content of the thermoplastic aliphatic polyester,
• wherein the thermoplastic aromatic polyester is obtained by condensation-polymerizing at least one aromatic polybasic acid and at least one glycol, and the at least one aromatic polybasic acid is selected from the group consisting of phthalic anhydride, isophthalic acid, terephthalic acid, diphenyl carboxylic acid and combinations thereof, and the at least one glycol is selected from the group consisting of ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, hexamethylene glycol, polyethylene glycol, butanediol and combinations thereof,
• wherein the thermoplastic aliphatic polyester is at least one selected from the group consisting of polycaprolactone, polycaprolactone diol, polycaprolactone triol, polyethylene succinate, polybutylene succinate and polylactic acid,
• wherein the polymer mixture comprises 3 to 40 parts by weight of the aliphatic polyester on the basis of 100 parts by weight of the polymer mixture,
• the method comprising the steps of:
• immersing the molded product in a decomposing solution containing a base and a hydrophilic solvent at a temperature lower than the boiling point of the hydrophilic solvent, and
• decomposing at least a part of the structure material forming the molded product and then separating and collecting the metal.