Patent ID: 11859066
Assignee: SYNTHOS S.A.
Field: Other special machines (Mechanical engineering)
Classification: CPC C  Y | IPC C

Claim 12:
13. Process for the preparation of the expandable polymer granulate of claim 1 comprising the following steps:
i) providing continuously to a mass prepolymerization reactor or the first from a cascade of reactors a stream of:
i1) styrene monomer and optionally a comonomer,
i2) at least one additive solution, and
i3) optionally recycled monomer,
ii) continuing polymerization in the prepolymerization reactor or the sequence of cascade reactors to form the styrene homopolymer or styrene copolymer,
iii) addition of the mineral of the general formula ABX3, A and B being cations and X being anions, wherein the mineral has perovskite crystal structure, and the one or more athermanous additives and optionally further additives,
iv) degassing the styrene homopolymer or styrene copolymer,
v) feeding the styrene homopolymer or styrene copolymer in molten state into an extruder,
vi) optionally adding a flame retardant system including synergist and thermal stabilisers,
vii) injecting the one or more blowing agents, thereby forming a homogenous blend,
viii) extruding the homogenous polymer blend, and
ix) pelletizing in an underwater pelletizer, so as to obtain the granulate.