FIELD: chemistry.
SUBSTANCE: present invention relates to a composition of a water-redispersible polymer powder based on at least one synthetic polymer and at least one natural latex and which is used in compositions of construction materials. The composition of said polymer powder contains at least one water-insoluble synthetic polymer, preferably about up to 90 wt %, at least one modified natural latex, preferably about up to 90 wt %. The natural latex is obtained by mixing and reacting it, in aqueous phase, with at least one radical initiator and/or oxidising agent. The water-insoluble synthetic polymer is obtained using emulsion, suspension, microemulsion and/or inverted emulsion polymerisation. The composition also contains preferably about 0-50 wt % of at least one protective colloid, about 2-50 wt % of at least one filler and/or anti-caking agent. The composition also optionally contains additives. Modified latex, which is subsequently dried, is mixed with the synthetic polymer. The synthetic polymer is added before, during and/or after adding at least one radical initiator and/or oxidising agent. The synthetic polymer is added and/or in form of water-redispersible polymer powder.
EFFECT: invention enables to obtain redispersible polymer powder with improved water repellence and reduced water absorption.
15 cl, 4 tbl, 15 ex
