Halogenated aromatic epoxy resins are disclosed wherein the halogen atoms are in the meta position with respect to a glycidyl ether group attached to an aromatic ring.
Advanced epoxy resins are disclosed which result from the reaction of a relatively low molecular weight epoxy resin and a polyhydric phenol wherein at least one of the reactants contains at least one halogen atom which is meta with respect to a glycidyl ether group or a hydroxyl group attached to an aromatic ring. These advanced epoxy resins, when cured with a suitable curing agent, possess an improvement as compared to an advanced epoxy resin containing halogen atoms which are ortho with respect to a glycidyl ether group in at least one of thermal stability, glass transition temperature, relationship of viscosity to molecular weight and resistance to forming hydrolyzed halides in the presence of a refluxing solution of an alkali metal hydroxide.
本发明公开了卤代芳香族环氧
树脂,其中的卤素原子相对于连接到芳香环上的
缩水甘油醚基团而言处于元位置。
已公开的高级环氧
树脂是由分子量相对较低的环氧
树脂和多羟基
酚反应而成,其中至少一种反应物含有至少一个卤原子,该卤原子相对于
缩水甘油醚基团或连接到芳香环上的羟基而言处于偏位。这些高级环氧
树脂用适当的固化剂固化后,与含有卤素原子的高级环氧
树脂相比,至少在热稳定性、
玻璃化温度、粘度与分子量的关系以及在碱
金属氢氧化物的回流溶液存在下形成
水解卤化物的耐受性等方面有改善。