Dihydroxy compounds with outstanding thermal stability contain a specified amount of o,p-bisphenol and polymers of dihydroxy compounds having terminal groups derived from o,p-bisphenol and show outstanding retention stability during molding.
A dihydroxy compound mixture is obtained by adding (A) o,p-bisphenol having a specified structure to (B) a dihydroxy compound having a purity of 99.95% by weight or above as measured by high-performance liquid chromatography using a unit equipped with an ultraviolet absorption detector in which the o,p-bisphenol (A) is contained in the amount of 5 x 10-5 to 3 x 10-2 moles with respect to a total of 1 mole of the dihydroxy compound.
Polymers have units derived from dihydroxy compounds and terminal groups derived from (A) o,p-bisphenol.
具有出色热稳定性的二羟基化合物含有一定量的邻,对二
酚,以及二羟基化合物的聚合物,其末端基团来自邻,对二
酚,并在成型过程中显示出出色的保持稳定性。
二羟基化合物混合物是将(A)具有特定结构的邻,对双
酚加入到(B)二羟基化合物中得到的,二羟基化合物的纯度为 99.95%(重量)或以上,该纯度是通过配备紫外线吸收检测器的高效
液相色谱法测量的,其中邻,对双
酚(A)的含量为 5 x 10-5 至 3 x 10-2 摩尔,二羟基化合物的总量为 1 摩尔。
聚合物的单元来自二羟基化合物,末端基团来自(A)邻,对二
酚。