LIQUID POLYURETHANE PLASTICIZERS CONTAINING ALLOPHANATE AND/OR CARBODIIMIDE AND/OR URETONIMINE GROUPS

This invention relates to novel liquid, polyurethane plasticizers which contain less than 13% by weight, preferably less than 6% by weight of allophanate groups, carbodiimide groups, and/or uretonimine groups, and to a process for the preparation of these liquid polyurethane plasticizers. These comprise the reaction product of at least one organic isocyanate component selected from the group consisting of allophanate modified isocyanates, carbodiimide modified isocyanates, and uretonimine modified isocyanates; with an isocyanate-reactive component which is selected from the group consisting of: (1) one or more isocyanate-reactive compounds having a molecular weight of more than about 1,000, an OH number of about 9 to about 112 and a functionality of about 2 to about 4, and (2) one or more monofunctional alcohols having a molecular weight of about 100 to about 1,000, and an OH number of about 56 to about 560, with the proviso that a stopper comprising a low molecular weight monoalcohol is present when the isocyanate-reactive component only contains (1) one or more isocyanate-reactive compounds having a molecular weight of more than about 1,000, an OH number of about 9 to 112 and a functionality of about 2 to about 4. This invention also relates t o a process for the production of a polyurethane comprising reacting a polyisocyanate with an isocyanate-reactive compound in the presence of the liquid, polyurethane plasticizers described herein, and to the resultant polyurethanes containing these plasticizers.