Polyurethane elastomer is derived from a Di - or Poly isocyanate and polyol mixture, topped with polyoxyethylene polyol,Polyol mixture multidisperso yprepolimero finished with isocyanate used in the production of the elastomer.

摘要

Polyurethane elastomers are prepared that exhibit improved green strength while maintaining short release times; The preparation is made from ultra-low unsaturation polyoxypropylene polyols containing up to 20 percent by weight of internal and random deoxyethylene entities. Elastomers absorb less than 10 weight percent water at 0 ° C. Polyoxyethylene polyols containing thePolyoxyethylene solid can be used to produce projective polygonal cyclopropene made of ultra-low unsaturated polyoxyethylene. These cyclopropene have no eddy current and can be used to prepare 4.4-mdi eddy current free preliminaries. Polydispersive polytetrafluoroethylene dioxypropene mixtureThe treatment of elastomer can be further improved because of the presence of dispersed ultra-low unsaturated isomerized deoxidized debris.