A substantially linear polyhydroxy polyether, which is composed substantially of aromatic units and aliphatic units, the proportion of the aromatic units being 50 to 98 mole % based on the total amount of the aromatic units and the aliphatic units, has {HEAD ~ an intrinsic viscosity}, measured at {TAIL ~ 25 DEG C.} in o chlorophenol, of from 0.3 to 2 dl/g, and has a glass transition, temperature of from 30 DEG to 120 DEG C. Two processes for preparing the polyhydroxy polyether are proposed 
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A substantially linear polyhydroxy polyether , which is composed substantially of aromatic units and aliphatic units , the proportion of the aromatic units being 50 to 98 mole % based on the total amount of the aromatic units and the aliphatic units , has { HEAD ~ an intrinsic viscosity } , measured at { TAIL ~ 25 DEG C. } in o chlorophenol , of from 0.3 to 2 dl / g , and has a glass transition , temperature of from 30 DEG to 120 DEG C. Two processes for preparing the polyhydroxy polyether are proposed
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