| 摘要 |
Cellular polyurethanes are obtained by reacting a polyether with either a polyisocyanate or a polyisothiocyanate, water and a polysiloxane-oxyalkylene copolymer in the presence of an organo-tin compound. The polyether is defined as being linear or branched and having at least one ether linkage and containing at least two hydroxyl groups and being substantially free from other functional groups, but the presence of other functional groups, e.g. amino or carboxyl, is not excluded provided the essential character of the starting material as a polyether is not destroyed. The tin compound preferably contains at least one direct carbon to tin bond and at least one bond from tin to halogen, oxygen, sulphur, phosphorous or nitrogen. Fillers, e.g. glass or diatomaceous earth (up to 20%), silicone oils and dyes may also be included. Lists of suitable components are given. Specifications 845,827 and 892,137 are referred to.ALSO:Cellular polyurethanes are obtained by reacting a polyether with either a polyisocyanate or a polyisothiocyanate, water and a polysiloxane-oxyalkyline copolymer in the presence of an organo-tin compound. The polyether is defined as being linear or branched and having at least one ether linkage and containing at least two hydroxyl groups and being substantially free from functional groups other than hydroxyl, however the presence of other functional groups, e.g. amino or carboxyl, is not excluded provided the essential character of the starting material as a polyether is not destroyed. The tin compound preferably contains at least one direct carbon to tin bond and at least one bond from tin to halogen, oxygen, sulphur, phosphorus or nitrogen. Fillers e.g. glass or diatomaceous earth (up to 20%) silicone oils, and dyer may also be included. Lists of suitable components are given. Specifications 845,827 and 892,137 are referred to. |
