FIELD: process engineering.
SUBSTANCE: invention relates to thermally expanding thermoplastic microspheres and their application. Said microspheres comprise polymer shell made from ethylenically unsaturated monomers that encapsulate propellent. Ethylenically unsaturated monomers comprise up to 20-80 wt % of acrylonitrile and 1-70 wt % of poly(vinyl alcohol) with single carbon-carbon olefinic linkage. Total amount of acrylonitrile and poly(vinyl alcohol) makes up to 100 wt % of ethylenically unsaturated monomers.
EFFECT: higher expansivity and chemical resistance, absence of halogen-containing monomers.
23 cl, 5 tbl, 45 ex
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