Polyethylene terephthalate resin composition, molded product and resin modifying method

Method for modifying a starting resin consisting essentially of a polyethylene terephthalate resin to a modified resin wherein the crystallization rate thereof is lower than that of the corresponding natural polyethylene terephthalate resin containing no coloring agents, which consists essentially of adding nigrosine to the starting polyethylene terephthalate resin.

Method for modifying a starting resin consisting of a polyethylene terephthalate resin to a modified resin wherein the crystallization rate thereof is lower than that of the corresponding composition consisting essentially of the polyethylene terephthalate resin and carbon black, which consists essentially of adding nigrosine to the starting polyethylene terephthalate resin.

Method for modifying a starting resin consisting essentially of a polyethylene terephthalate resin to a modified resin wherein the corresponding molded product thereof can elongate more than 200%, which consists essentially of adding nigrosine to the starting polyethylene terephthalate resin.

Method for modifying a starting resin consisting essentially of a polyethylene terephthalate resin to a modified resin wherein the corresponding molded product thereof can elongate more than two times relative to the corresponding natural polyethylene terephthalate resin containing no coloring agents, which consists essentially of adding nigrosine to the starting polyethylene terephthalate resin.

Composition consisting essentially of a resin and nigrosine, wherein the resin consists essentially of a polyethylene terephthalate resin, the nigrosine is present in an amount of about 0.01 to 10% by weight relative to the polyethylene terephthalate resin, and the composition has a crystallization rate upon molding which is lower than that of the corresponding natural polyethylene terephthalate resin containing no coloring agents and which is also lower than that of the corresponding composition consisting essentially of the polyethylene terephthalate resin and carbon black.

Composition consisting essentially of a resin and nigrosine, and optionally a fibrous reinforcing material, wherein the resin consists essentially of a polyethylene terephthalate resin, the nigrosine content is about 0.01 to 10% by weight relative to said resin, and the optional fibrous reinforcing material content, where present, is about 5 to 120% by weight relative to said resin.