METHOD OF PRODUCING POLYMER FILM MATERIAL Russian patent published in 2015 - IPC C08J5/18 C08L23/04 C08L23/16 

FIELD: chemistry.

SUBSTANCE: invention relates to the technology of producing polymer film materials with special mechanical properties, which can be used in food and processing industries. The disclosed method is carried out as follows. Granular polyolefin in the form of 70 wt % low-pressure polyethylene and 30 wt % high-pressure linear polyethylene is thoroughly mixed with a granular copolymer which includes propylene (75%) and diene (25%), combined with a superconcentrate PO AK 12 in amount of 1.0% of the total weight of polyolefins and modifier, sliding additive PO AS 12 in amount of 1.0% of the total weight of polyolefins and modifier for 30 minutes and the mixture is molten (version 1a), followed by extrusion of the melt, cooling, orientation and heat setting the film. The diene is dicyclopentadiene or butadiene or 1,4-hexadiene or a diene monomer based on norbonene dethylidene. In versions of the method, the modifier used is also a copolymer (version 1b) of propylene (50%), diene (2%) and ethylene (48%). The amount of the modifier in the material in different experiments is 20, 30, 40, 50, 60 and 65% of the weight of the polymer composition: polyolefin and modifier. Versions of the method further include addition of a biodegradable additive (version 1c) in amount of 1-5% of the total weight of the polymer composition: polyolfeins, modifier, superconcentrate PO AK 12, sliding additive PO AS 12. The rate of decomposition of the film in natural conditions is determined by an indirect method according to GOST 12020-12. In formulations, the rate of decomposition is in the range of 30-60 days.

EFFECT: providing uniformity of supply and monitoring the shape of articles, obtaining films with a small thickness - 10-15 mcm, capable of retaining up to 80% of bending and twisting deformation, high lustre and quality of the surface (eliminating the "sharkskin" effect), reduced load on the shaft, which improves efficiency and reduces power consumption, low processing temperature; eliminating burning (sticking) on shaping edges, shorter time for holding the materials in the extruder, which allows fast change of operating conditions; low cost of the running meter of the product; self-decomposition of the film material in ambient conditions.

2 cl, 1 tbl