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US 5,308,878 AGranted
Process for producing foamable particles of styrenic polymers, having improved processability and mechanical properties
AssigneeEnichem S.p.A.
InventorsFrancesco Anfuso, Roberto Lanfredi, Gianfranco Veroli, Italo Borghi
Life of this patent
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Abstract
Process for producing foamable particles of styrenic polymers, which consists in submitting said particles to a partial loss of foaming agent, performed in an oven at a lower temperature than the glass transition temperature (Tg) of said particles.
Claims16
A process for producing foamable particles of styrenic polymers having improved processability and mechanical characteristics, said process consisting in
- (i) coating said styrenic polymer particles, containing therein from 2 to 20% by weight of a foaming agent, with an antistatic agent in an amount of not more than 1% by weight based on the polymer particles;
- and
- (ii) partially removing from said styrenic polymer particles not more than 60% by weight of the foaming agent, before the pre-forming, by treatment in oven and at a temperature lower than the glass transition temperature of said particles.
Dependencies are inferred from the claim text.