Process for recovering secondary polyols from polyadducts mixed

Details Process for recovering secondary polyols from polyadducts mixed Process for recovering secondary polyols from polyadducts mixed

1995-09-22

1997-11-04

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Process of treating scrap or waste product containing solid...

521 495, 528495, 428184, C08J 1104

Patent

active

056840543

ABSTRACT:
The invention comprises a process for recovering secondary polyols from polyadducts which contain nonglycolysable constituents. In the process, a precomminuted polyadduct starting material is pretreated with glycols in a shear reactor at elevated temperature and pressure, for a relatively short time period, the nonglycolysable constituent being further comminuted and dispersed and the polyadducts being preglycolyzed. The preproduct thus obtained is broken down in subsequent stir reactors at a somewhat elevated temperature and for longer times, first without the further addition of glycol, and then with further addition of glycol. From the secondary polyol finally obtained, a plastic can be produced which can be further processed to make plastic components.

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