申请人:MITSUI PETROCHEMICAL INDUSTRIES, LTD.
公开号:EP0394751A2
公开(公告)日:1990-10-31
A cocondensation polyester according to the present invention is substantially linear and is composed of mononuclear aromatic dicarboxylic acid constituent units comprising isophthalic acid constituent units as their main ingredient, (b) binuclear aromatic dicarboxylic acid constituent units comprising 2,6-naphthalenedicarboxylic acid constituent units as their main ingredient, (c) diol constituent units comprising ethylene glycol constituent units as their main ingredient, and (d) polyfunctional constituent units derived from a polyfunctional compound having 3 or more carboxyl groups and/or hydroxyl groups in total and 3 to 15 carbon atoms, said polyester having an intrinsic viscosity [η] of 0.5 to 1.5 dl/g and a glass transition temperature of 70°C or higher.
A second cocondensation polyester according to the present invention is substantially linear and is composed of the above-mentioned (a) mononuclear aromatic dicarboxylic acid constituent units, (b) binuclear aromatic dicarboxylic acid constituent units, (c) diol constituent units, (d) polyfunctional constituent units, and additional (e) aliphatic dicarboxylic acid constituent units comprising succinic acid constituent units as their main ingredient, said polyester having an intrinsic viscosity [η] of 0.5 to 1.5 dl/g.
Furthermore, the present invention provides a process for preparing these cocondasation polyesters, and uses thereof by utilizing excellent gas barrier properties and transparency thereof.
根据本发明的缩聚聚酯基本上是线性的,由单核芳香族二羧酸组成单元组成,其主要成分是间苯二甲酸组成单元;(b) 双核芳香族二羧酸组成单元,其主要成分是2,6-萘二甲酸组成单元、(c) 以乙二醇组成单元为主要成分的二元醇组成单元,以及 (d) 由具有 3 个或 3 个以上羧基和/或羟基以及 3 至 15 个碳原子的多官能团化合物衍生的多官能团组成单元,所述聚酯的固有粘度[η]为 0.5至1.5分升/克,玻璃化转变温度为70℃或更高。
根据本发明的第二种缩酮聚酯基本上是线性的,由上述 (a) 单核芳香族二羧酸组成单元,(b) 双核芳香族二羧酸组成单元、(c) 二元醇组成单元,(d) 多官能团组成单元,以及 (e) 以琥珀酸组成单元为主要成分的脂肪族二羧酸组成单元,所述聚酯的固有粘度[η]为 0.5 至 1.5 分升/克。
此外,本发明还提供了一种利用优异的气体阻隔性和透明性制备这些稠化聚酯的工艺及其用途。