COMPOSITE MATERIAL AND COMPOSITE PRODUCT Russian patent published in 2021 - IPC B27K5/00 B27N1/02 C08L25/04 C08L97/00 

FIELD: composite materials.

SUBSTANCE: composite material contains at least 20% (wt.) of a cellulose material, at least 1% (wt.) and less than 20% (wt.) of a copolymer of a styrene maleic anhydride, and from 5% to 50% (wt.) of an impact-resistant polystyrene. The described cellulose material is thermally modified as a result of heat treatment at a temperature in the range of 160 to 250°C, preferably in the range of 200 to 230°C, at atmospheric pressure, or at a temperature greater than 120°C, at elevated pressure. The thermally modified cellulose material, the impact-resistant polystyrene and the copolymer of a styrene maleic anhydride are supplied into an extruder, and a composite product is extruded.

EFFECT: strength and stiffness characteristics are improved, creeping of the cellulose fibre contained in the composite material is reduced.

13 cl, 6 tbl