| abstract |
This invention relates to a process for making optionally cellular cross-linked elastomeric polyurethane resins from (A) POLYISOCYANATES, (B) HIGHER MOLECULAR WEIGHT POLYHYDROXYL AND/OR POLYAMINO COMPOUNDS CONTAINING FILLER PARTICLES, (C) CHAIN LENGTHENING AGENTS AND, OPTIONALLY, (D) BLOWING AGENTS, CATALYSTS AND OTHER ADDITIVES KNOWN PER SE, WHEREIN FILLER PARTICLES CAPABLE OF BEING CROSS-LINKED WITH THE FORMALDEHYDE ARE USED AND WHEREIN THE ELASTOMERIC POLYURETHANES WHICH CONTAIN FILLERS ARE CROSS-LINKED WITH FORMALDEHYDE OR FORMALDEHYDE RELEASING COMPOUNDS, AFTER THE CHAIN LENGTHENING REACTION HAS BEEN SUBSTANTIALLY COMPLETED. |