RHEOLOGICALLY STABLE AQUEOUS SUSPENSIONS OF MINERAL MATERIAL CONTAINING ORGANIC POLYMERS WITH LOW CONTENT OF VOLATILE ORGANIC COMPOUNDS (VOC) Russian patent published in 2016 - IPC C09C1/02 C09C3/10 C08K3/26 D21H17/67 D21H19/38 C04B14/28 A01N59/06 

FIELD: paper industry.

SUBSTANCE: invention can be used in production of paper, plastics, dyes, coatings, concrete, in agriculture and biotechnology. Rheologically stable aqueous suspension of mineral material contains at least one mineral material and at least one polymer of acrylic and/or methacrylic acid taken in the amount of 0.01 to 10 wt% per total weight of the solid substances in tha suspension. Said polymer is obtained by polymerizing a monomer(s) of acrylic and/or methacrylic acid in water using the compound of formula (I)

where X is Li, Na, K or H, and R is alkyl chain containing 1-5 carbon atoms. Compound of formula (I) is used in the amount of 0.1-2.5 wt% by weight of the said monomer(s). It has weight-average molecular weight M_w from 800 to 8,000 g/mol, coefficient of polydispersity I_p in the range from 2 to 3. Suspension of mineral material has content of volatile organic compounds (VOC) of ≤ 20 mg/kg.

EFFECT: invention enables to obtain a suspension of mineral material containing organic polymers with low content of VOC while preserving rheological stability and without deterioration of optical properties of the paper produced using the said suspension.

25 cl, 1 dwg, 4 tbl, 2 ex