AQUEOUS LATEX OF "CORE-SHELL" STRUCTURE Russian patent published in 2019 - IPC C08F220/18 C08F212/08 C09D133/14 D06M15/263 D06M15/356 D06M23/08 C08F265/04 

FIELD: textile.

SUBSTANCE: invention relates to an aqueous composition used as a binder for non-woven textile materials, a non-woven textile material and a method for production thereof. Aqueous composition contains (a) from 40 to 95 % by weight of the core polymer relative to the dry weight of the latex polymer and (b) from 5 to 60 % by weight of the coating polymer relative to the weight of the dry latex polymer. Core polymer contains (i) 95 to 100 wt. % relative to the weight of the dry core polymer, polymerised links of one or more monofunctional vinyl monomers, and (ii) from 0 to 5 wt. % relative to the weight of the dry polymer of the core, polymerised links of one or more multivinyl monomers. Glass transition temperature of core polymer is 50 °C or less, and is determined by differential scanning calorimetry using ASTM D7426-08 test method. Shell polymer contains (i) from 35 to 95 % by weight relative to weight of dry shell polymer, polymerised links of one or more single-functional vinyl monomers, and (ii) from 5 to 65 % by weight relative to weight of dry coating polymer, polymerised links of one or more vinyl monomers containing trialkoxysilyl groups. In the shell polymer, the amount of all monomers in addition to alkyl(meth)acrylates, styrene and vinyl monomers containing trialkoxysilyl groups, by weight relative to weight of the dry polymer, is from 0 to 3 %. Obtained aqueous composition contains particles of a latex polymer. Method of producing nonwoven textile material involves bringing said composition into contact with a plurality of fibers.

EFFECT: invention enables to obtain a polymer which is capable of cross-linking at a relatively low temperature after deposition on a substrate which does not release formaldehyde during crosslinking, is stable during storage, and provides good tensile strength of the textile substrate.

5 cl, 4 ex