REDUCTION OF VOC AND FOG VALUES IN HETEROGENEOUS POLYPROPYLENE WITH FILLER BY SEPARATE AERATION OF INDIVIDUAL POLYOLEFIN COMPONENTS Russian patent published in 2023 - IPC C08F6/00 C08J3/00 C08J3/20 C08L23/14 

FIELD: polymer production.

SUBSTANCE: methods for producing compositions of heterogeneous polypropylene filled with a low content of volatile organic and low volatile condensable substances. A method for reducing the content of volatile (VOC) and low-volatile organic substances, which are fats, oils and greases (FOG) in a heterogeneous polypropylene composition, which contains: (i) at least 15 wt.% at least a first heterogeneous polypropylene; (ii) less than 15 wt.% at least one elastomeric polyolefin and (iii) at least one filler; to a VOC level below 100 µg/g and an FOG below 390 µg/g, wherein the method comprises aerating the first heterogeneous polypropylene prior to extrusion with at least one elastomeric polyolefin and at least one filler. An option is also proposed in the presence of polyethylene and additional polyolefins in the composition.

EFFECT: economy, since it does not require aeration of the entire composite, allows the use of a wide range of temperatures and reduces the consumption of filler and other composite additives.

14 cl, 2 dwg, 2 tbl