The present invention concerns a one component foam (OCF) composition comprising a very low amount of free monomeric MDI. The present OCF composition may be obtained without any free MDI removal step, and without the addition of extra solvent to compensate for the substantially lower amount of free MDI, compared with traditional compositions. The present composition comprises a source of free NCO of functionality of at least 2.6, at least a specific mono-functional alcohol, a bi-functional alcohol, and a tri-or higher functional alcohol, all polyols being characterized by a rather low molecular weight. The OCF composition of the present invention is suitable for being dispensed from a pressurized can with a blowing agent.
本发明涉及一种单组分泡沫(OCF)组合物,该组合物包含极少量的游离单体
MDI。与传统组合物相比,本发明的单组分泡沫组合物无需任何去除游离
MDI 的步骤,也无需添加额外的溶剂来补偿大幅减少的游离
MDI 量。本组合物包括官能度至少为 2.6 的游离 NCO 源、至少一种特定的单官能醇、一种双官能醇和一种三官能醇或更高官能醇,所有多元醇的分子量都相当低。本发明的 OCF 组合物适合用发泡剂从加压罐中分装。