METHOD OF MANUFACTURE OF EXPANDED THERMOPLASTIC POLYMERS Russian patent published in 2021 - IPC B29C44/34 C08J9/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of manufacture of expanded thermoplastic polymers (eTP). The technical result is achieved through a method including a stage of producing non-expanded thermoplastic polymer (TP) and then locating the thermoplastic polymer in an autoclave. Said autoclave is partially filled with a liquid and the material does not come into contact with this liquid. After that the pressure in the autoclave is raised by supplying a gas fluid with the temperature in the autoclave lower than the melting temperature of the thermoplastic polymer. Following is a feeding stage to allow the non-expanded polymeric TP material to reach saturation. Then the expanded polymeric TP material is submerged into a liquid. After that the pressure in the autoclave is lowered so that the submerged polymeric TP material undergoes expansion forming eTP material.

EFFECT: technical result of the invention is improved thermal control, use of preferably environmentally friendly foaming gases, elimination of anisotropy and blocking of eTP during reprocessing and shortened feeding stage.

15 cl, 9 dwg, 2 ex