| 摘要 |
In an emulsion polymerisation process for the preparation of weathering-resistant polymers of vinyl chloride, the polymerisation of the monomers, comprising from 80 to 100% by weight of vinyl chloride, is carried out in the presence of a prepolymer dispersed in the aqueous phase. With this prepolymer as additive, a polymer having improved transparency and simultaneously high impact strength is obtained. The prepolymer is a copolymer of monounsaturated acrylates with a small amount of polyfunctional monomer; the polyfunctional monomer contains at least two non-conjugated ethylenic double bonds, of which at least one is of the allyl type. |
