MASTERBATCH FOR THERMOPLASTIC POLYMER Russian patent published in 2019 - IPC C08L23/02 C08L23/10 C08L23/08 C08L51/06 C08L83/10 

FIELD: technological processes.

SUBSTANCE: present invention relates to method for improving the scratch resistance of a composition comprising thermoplastic organic polymer (P), comprising in the first stage (I), the reaction mixing of thermoplastic organic polymer (A) and polyorganosiloxane (B) at a temperature at which thermoplastic organic polymer (A) and polyorganosiloxane (B) are in liquid phases, with the formation of a masterbatch, moreover, polyorganosiloxane (B) contains at least one functional group capable of reacting with thermoplastic organic polymer (A), so that during the reaction mixing copolymer (A) and (B) is formed in the masterbatch, where polyorganosiloxane (B) has a number average molecular weight Mn of more than 100,000 g/mol, and where thermoplastic organic polymer (A) has a melt flow index from 10 to 2,000 g/10 minutes, and in the second stage (II) – mixing the masterbatch with a composition containing thermoplastic organic polymer (P), moreover, thermoplastic organic polymer (P) is selected from a group comprising polypropylene homopolymer, polypropylene copolymer containing units of ethylene, polyethylene homopolymer, polyethylene copolymer containing units of propylene, and mixtures thereof, and where polyorganosiloxane (B) is the only polyorganosiloxane added to the process. Scratch-resistant polymer composition and the use of the masterbatch as an additive to increase the scratch resistance of a thermoplastic composition, preferably polypropylene compositions for use in automotive interiors, for example on an instrument panel are also described.

EFFECT: increasing the scratch resistance of the composition containing the thermoplastic organic polymer, with the result that such composition shows increased resistance to stress whitening, and the finishing of such composition has a high scratch resistance without adversely affecting the thermomechanical properties of the plastic matrix.

18 cl, 4 tbl, 24 ex