METHOD OF PRODUCING POLYFUNCTIONAL ADDITIVE, MEANS FOR OXO AND BIOCORBING POLYOLEFINS Russian patent published in 2019 - IPC C08J3/22 C08L23/00 C08L101/16 C08K5/98 C08K3/20 C08K9/04 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to technologies of producing oxo and biodegradable polymer materials, particularly to additives which increase oxo and biodegradation of polyolefins (prooxidants), and can be used to create materials and articles made thereof, capable of being subjected to accelerated oxo and biodegradation under natural conditions. Invention relates to a method of producing a polyfunctional additive which promotes oxo and biodegradation of polyolefins, which involves depositing an alternating valence or mixture of carboxylates of variable valence metals on an inert metal carboxylate carrier to obtain an end component of a polyfunctional additive, followed by obtaining a polyolefin-based masterbatch. Carboxylate metal of variable valence is represented by cobalt, iron, copper stearates or a combination thereof. Inert carrier used is calcium oxide, which promotes moisture absorption during processing of secondary polyolefins, polyethylene is used as the polyolefin masterbatch fiber, the target component of the polyfunctional additive is prepared at the following ingredients content, wt%: carboxylate metal of variable valence 10–30, calcium oxide 70–90. Application of carboxylate metal of variable valence to inert carrier is performed by mixing in high-speed mixer for 1–2 minutes, obtained target component of polyfunctional additive is mixed with polyolefin base of masterbatch in high-speed mixer in ratio of (40–60):(40–60) wt% and extruded in a twin-screw extruder with a granulating device to obtain granules of a polyfunctional additive with diameter of 2–8 mm.

EFFECT: obtaining a polyfunctional additive, imparting articles to accelerated oxo and biodegradation, as well as acting as a desiccator for making articles from secondary polyolefins, simple technique of producing a pro-oxidant to polyolefins, high environmental friendliness of production, low cost of the product.

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