METHOD FOR EFFICIENT MIXING WHEN PRODUCING THERMOPLASTIC ELASTOMER COMPOSITION Russian patent published in 2012 - IPC C08J3/24 C08L23/28 C08L77/00 B29C47/40 

FIELD: chemistry.

SUBSTANCE: thermoplastic elastomer composition is obtained through dynamic vulcanisation in a high-shearing mixer at high temperature. The composition contains dispersed particles of a first halogenated elastomer containing isobutylene, and dispersed particles of a second elastomer having a functional group capable of reacting with a polyamide and being grafted onto the polyamide. Particles of the first and second elastomers are dispersed in a continuous thermoplastic polyamide matrix. The method involves dispersion of a curing agent in the halogenated elastomer and obtaining a pre-formed, preferably granulated composition. Polyamide resin and optional light stabilisers are then fed into the mixer. Shearing action is applied and heating is carried out to melt the polyamide and obtain a mixture. A polyamide plasticiser is then added to reduce viscosity of the polyamide mixture. Granules of the pre-formed elastomer composition are then fed into the mixer and heating and shearing action is then applied. The second elastomer is fed and heating and shearing action is continued in order to disperse the second elastomer. After dynamic vulcanisation, the thermoplastic elastomer composition is discharged from the mixer.

EFFECT: invention enables to obtain improved impermeability characteristics for gases and fluid media, strength and longevity.

20 cl, 9 tbl