POLYESTER, POLYESTER COMPOSITION, POLYESTER LAMINATE, AND PROCESS FOR PRODUCING BIAXIALLY STRETCHED POLYESTER BOTTLES

摘要

The present invention concerns a polyester composition comprising: ÄAÜ 1-99 wt.-% of a first polyester comprising (i)units derived from at least one dicarboxylic acid selected from terephthalic acid, isophthalic acid and naphthalenedicarboxylic acid, and (ii) units derived from diols comprising ethylene glycol and a poly(C2-10-alkylene)glycol having a polymerization degree of 5-50, the proportion of units derived from the poly(C2-10-alkylene)glycol is 0.001-10 wt.-% based on the diol-derived units; and ÄBÜ 1-99 wt.-% of a second polyester comprising (i) units derived from at least one dicarboxylic acid selected from terephthalic acid, isophthalic acid and naphthalenedicarboxylic acid and (ii) units derived from diols comprising ethylene glycol, wherein the proportion of units derived from a polyalkylene glycol is less than 0.001 wt.-%, based on the diol-derived units; and a preform formed from this polyester composition, a biaxially stretched bottle comprising this polyester composition, and a process for producing the biaxially stretched polyester bottle.