PROCESS FOR PREPARING POUR-IN-PLACE FLEXIBLE POLYURETHANE FOAM ARTICLES

외부층으로의 스트라이크 쓰루가 감소된 포어-인-플레이스 유연 우레탄 발포 배합물이 성형, 모울드내의 외부피복물 안쪽으로 액체 반응 혼합물을 주입시킨 후 상기혼합물을 반응시킴에 의하여 제조되어진다. 상기 혼합물은 폴리에테르 폴리올, 글리세린 또는 (폴리) 사카라이드와 같은, 물에 적어도 부분적으로 용해되는 폴리히드릭 물질의 폴리올, 유기폴리이소시아네이트, 촉매 및 실리콘 안정제로 구성된다. It has been discovered that a particular polyurethane formulation may be used to prepare "pour-in-place" (PIP) polyurethane foam articles where the formulation is injected into a mold bearing an exterior covering such as a fabric without the foaming liquid striking through the layer. The formulation employs a hydrophilic polyhydric compound to help the reactivity balance that minimizes penetration of the exterior covering while also stabilizing the rising foam against shear collapse without excessively tightening the foam. Contrary to the conventional expectation that the hydrophilic polyhydric compound would cause strike through problems since it delays the initial reaction time, it has been found to have the noted stabilizing effect. A preferred hydrophilic polyhydric compound is glycerine. A preferred isocyanate for the formulation is tolylene diisocyanate (TDI), in contrast to diphenylmethane diisocyanate (MDI) heretofore used in PIP foams.