| 摘要 |
PVC-plastisols are well known in many industrial processes. However, it is now know that vinyl chloride per so presents a health hazard. known plastisols of PVC have a disadvantage in that they tend to release vinyl chloride during processing. The present invention seeks to overcome this drawback of the prior art by providing a plastisol, in which solid particles of an organic polymer component (a) are dispersed in an organic liquid compoment (b), which serves as a compatible plasticiser for the organic polymer, in a proportion effective to form a viscous dispersion having a liquid or past-like appearance capable of being gelled by heating, the improvement in which the organic polymer component consists substantially of units derived from (i) at least one monomer selected from: t-butly acrylate, a C1-4 alkyl methacrylate and cyclohexyl methacrylate, or (ii) at least one of the above monomers and at least one comonomer selected from: methacrylates of aliphatic C2 to C10 alcohols, acrylates of aliphatic C1-C10 alcohols, styrene and alpha-styrene, the polymer having a glass transition temperature of above 35.degree.C and an average degree of poly-merization of more than 400, and the average particle size of the polymer in the plastisol being from 0.1 to 500 microns; said plasticiser being present in an amount of from 30 to 1000 parts per 100 parts by weight of said polymer and being sufficiently compatible that at least 8 days after the gelling of said plastisol, the plasticiser does not exude from said plastisol, said plasticiser moreover being effective to provide the plastisol with a viscosity index V8/0 of less than 3.0. |
