FIELD: chemistry.
SUBSTANCE: invention relates to a composition for producing polyvinyl chloride (PVC) articles which can be used in construction engineering, for example, and primarily for making structural shapes, especially window sections, plates and tubes. The composition consists of at least the following components (I) 100 pts. wt of component (A) consisting of PVC with K-value of 55-80 in accordance with ISO 1628-2; (II) 0.1-20 pts. wt of component (B) in terms of component (A), consisting of calcium carbonate with particle size of 10-90 nm, and a coating of stearic acid in amount of 1-4 wt %; (III) 0.1-10 pts. wt of component (C) in terms of component (A), consisting of a shock resistance modifier; (IV) 0.1-10 pts. wt component (D) in terms of component (A) consisting of a mixture of stabilisers; (V) 0.1-10 pts. wt component (E) in terms of component (A) which is titanium dioxide. Components are mixed in such a way that addition of component (B) to component (A) in a heat exchanger-mixer is done before addition of components (C), (D) and (E), and components (A) and (B) are stirred together for 30-60 seconds before adding the rest of the components.
EFFECT: higher heat resistance, surface quality and impact viscosity.
6 cl, 2 tbl, 5 ex
