초록 ▼

A polyethylene-2,6-naphthalene dicarboxylate resin contains an antimony compound as a polycondensation catalyst, and has an intrinsic viscosity of 0.55 to 0.75 dl/g, a terminal carboxyl group content of 32 eq/ton or less, an acetaldehyde content of 8 ppm or less and a diethylene glycol component con

A polyethylene-2,6-naphthalene dicarboxylate resin contains an antimony compound as a polycondensation catalyst, and has an intrinsic viscosity of 0.55 to 0.75 dl/g, a terminal carboxyl group content of 32 eq/ton or less, an acetaldehyde content of 8 ppm or less and a diethylene glycol component content of 0.8 to 3.0 wt %. A preform and a bottle made of the resin are also described.

대표청구항 ▼

[ What is claimed is:] [1.]1. A polyethylene-2,6-naphthalene dicarboxylate resin for molding a bottle,which comprises 70 mol % or more of 2,6-naphthalenedicarboxylic acid as a main acid component and 70 mol % or more of ethylene glycol as a main glycol component;contains an antimony compound as a po

[ What is claimed is:] [1.]1. A polyethylene-2,6-naphthalene dicarboxylate resin for molding a bottle,which comprises 70 mol % or more of 2,6-naphthalenedicarboxylic acid as a main acid component and 70 mol % or more of ethylene glycol as a main glycol component;contains an antimony compound as a polycondensation catalyst and a cobalt compound, a magnesium compound, a calcium compound and a phosphorous compound in such amounts that they satisfy the following expressions:wherein Co, Mg, Ca, P, and Sb indicate the number of moles of cobalt atoms in the cobalt compound, the number of moles of magnesium in the magnesium compound, the number of moles of calcium in the calcium compound, the number of moles of phosphorous in the phosphorous compound and the number of moles of antimony in the antimony compound, based on 1 ton of acid components constituting the polymer, respectively;and has an intrinsic viscosity of 0.55 to 0.75 dl/g, a terminal carboxyl group content of 32 eq/ton or less, an acetaldehyde content of 8 ppm or less, a diethylene glycol component content of 0.8 to 3.0 wt % based on the entire weight of said polyethylene-2,6-naphthalene dicarboxylate resin, respectively, and has a b value in the range of +0.6 to -6.0.