PLASTISOLS BASED ON STYRENE/ACRYLATE LATEX COPOLYMERS AND A METHOD FOR PREPARATION THEREOF Russian patent published in 2007 - IPC C08F257/02 C08J3/18 

FIELD: polymer materials.

SUBSTANCE: invention, in particular, relates to preparation of chlorine-free plastisols based on latex copolymers of styrene, alkyl (meth)acrylates, and (meth)acrylic acids and discloses a plastisol based on styrene/acrylate latex copolymer having morphology of primary "nucleus-shell" particles and organic plasticizer. Plastisol is characterized by including (i) 50-60 wt % of styrene/acrylate latex copolymer with volume-average diameter of primary particles between 450 and 1500 nm and nucleus copolymer-to-shell copolymer mass ratio between 1:10 and 1:25, said nucleus copolymer containing styrene and alkyl (meth)acrylate units at their mass ratio between 35:65 and 70:30, whereas said shell copolymer is constituted by styrene, alkyl (meth)acrylate, and (meth)acrylic acid units at average mass ratio (45-60):(30-50):(5-15), wherein concentration of (meth)acrylic acid units partially neutralized with alkali metal hydroxide (meutralization degree 5-30%) is increased in radial direction of the shell from 0-2.0 to 6.6-25 wt %, and (ii) 40-50 wt % of phthalate- or phosphate-type organic plasticizer representing a mixture of two plasticizers, one being highly compatible with nucleus and shell copolymers and the other being low compatibles at their mass ratio 0.33-2.33. Preparation method is also described.

EFFECT: simplified plastisol preparation procedure and increased viability of plastisol.

5 cl, 2 dwg, 3 tbl, 28 ex