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Norsk Hydro ASA
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Individual
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Priority claimed from NO19961625Aexternal-prioritypatent/NO308414B1/en
Application filed by IndividualfiledCriticalIndividual
Publication of CA2252514A1publicationCriticalpatent/CA2252514A1/en
Application grantedgrantedCritical
Publication of CA2252514CpublicationCriticalpatent/CA2252514C/en
Processes Of Treating Macromolecular Substances
(AREA)
Abstract
The present invention concerns a procedure for the production of PVC particles with a narrow size distribution in the range 10-50 µm, preferably 10-30 µm, in which, in a first stage, a vinyl monomer or a mixture of monomers is polymerised to form a polymer/oligomer seed particle in the range 1-10 µm. In a second stage, another vinyl monomer or mixture of monomers is swelled into the polymer/oligomer seed particles and polymerisation takes place in such a way that they grow into polymer particles of the desired size. It is preferable to use aromatic vinyl monomers or acrylates as the monomer in the seed particles. The seed particles in the first stage can be produced in a two-stage swelling process or by dispersion polymerisation.
CA002252514A1996-04-231997-04-21Method for the production of pvc particles
Expired - Fee RelatedCA2252514C
(en)
Particulate polymer composition, a method of making particulate polymer compositions, and light-scattering thermoplastic polymer compositions containing the particulate polymers