| 摘要 |
<p>PCT No. PCT/DE91/00622 Sec. 371 Date Nov. 1, 1993 Sec. 102(e) Date Nov. 1, 1993 PCT Filed Jul. 31, 1991 PCT Pub. No. WO92/02576 PCT Pub. Date Feb. 20, 1992.This invention relates to a process for preparing polyol-containing dispersions by reacting polyurethane-urea waste with at least one linear and/or branched-chain diol and/or polyol with a mol mass of 50-1000 g/mol in a ratio by weight of polymer waste to diol and/or polyol of greater than 3:1 at a temperature of 150 DEG -250 DEG C., optionally in the presence of acid or basic catalysts, and by dispersing the reaction product in at least one primary polyol with a mol mass up to about 6000 g/mol. The resultant dispersions are suitable for the preparation of polyurethanes or polyurethane-ureas.</p> |
