DISPERSANT FOR SUSPENSION POLYMERISATION, VINYLCHLORIDE RESIN AND METHOD OF OBTAINING THEREOF Russian patent published in 2016 - IPC C08F2/20 C08F2/18 C08F14/06 

FIELD: chemistry.

SUBSTANCE: claimed invention relates to dispersant for suspension polymerisation. Described is dispersant for suspension polymerisation, applied in obtaining of vinylchloride resin by suspension polymerisation, including modified polyvinyl alcohol, which contains component unit, described by the following chemical formula (A), and characterised by saponification number, constituting 75 mol % and more and lower than 90 mol %, optical density in the area of wavelength 280 nm, according to definition for water or mixed water and methanol solution at concentration 0.2 wt %, in the range from 0.5 to 2.5, and viscosity, according to definition by the method, given in document JIS K 6726, which constitutes 4 mPa·s and more and less than 30 mPa·s: (A), where X₁ and X₂ can be identical to each other or different from each other and represent alkyl group, which is characterised by quantity of carbon atoms in the range from 1 to 12, or hydrogen atom, g represents integer number in the range from 1 to 3, wherein dispersant is characterised by temperature of turbidity, according to definition for water solution at concentration 4 wt %, constituting 50°C and more. Also described is vinylchloride resin, characterised by bulk specific density, constituting 0.05 g/cub. cm and more, and obtained as a result of dispersion in water of vinylchloride monomer or mixture of monomers, which contains vinylchloride monomer, with application of said dispersant for suspension polymerisation and carrying out suspension polymerisation of dispersion. Also described is method for obtaining vinylchloride resin by dispersion in water of vinylchloride monomer or mixture of monomers, containing vinylchloride monomer, and carrying out suspension polymerisation of dispersion, where said dispersant for suspension polymerisation is applied.

EFFECT: dispersant, which ensures obtaining vinylchloride resin, characterised by reduced trend to form "fish eye" defect and increased bulk specific density, which leads to obtaining low-viscous water solution and which has improved processability in the process of solubilisation.

4 cl, 2 tbl, 6 ex