POWDERED PREPOLYMER OF THERMOCOMPRESSION SYNTACTIC FOAM PLASTIC Russian patent published in 2019 - IPC B32B5/20 C08J9/32 

FIELD: technological processes.

SUBSTANCE: invention relates to powder pre-polymer of thermo-compression syntactic foam plastic. Powder prepolymer of thermo-compression syntactic foam plastic contains polymer unexpanded microspheres, capable of expansion in temperature range of up to 150 °C, heat resistance not less than 170 °C, with diameter of up to 40 mcm in unexpanded state and bulk density in expanded state of not more than 40 kg/m³, taken in amount of 4–50 wt% of total weight of composition, powder of thermoplastic polymer with particle size of 1–315 mcm and flowing temperature (or melting) of not more than 150 °C, in amount of 50–95 wt% of total weight of composition, pyrogenic silicon dioxide with specific surface area of 175–380 m²/g in amount of 0.02–1 wt% of total weight of composition and inorganic filler-pigment in amount of 0–20 wt% of total weight of composition.

EFFECT: invention makes it possible to create syntactic foams by sintering method in shaping tooling, having the ability to secondary expansion and thermal welding.

5 cl, 2 tbl