Polystyrene foam sheet for forming deep drawn articles, and...

Details Polystyrene foam sheet for forming deep drawn articles, and... Polystyrene foam sheet for forming deep drawn articles, and...

C - Chemistry, Metallurgy

08

J

C08J 9/22 (2006.01) B32B 5/18 (2006.01) C08L 25/06 (2006.01)

Patent

CA 2252759

A polystyrene foam Sheet (A) for thermoforming deep drawn articles. The polystyrene foam sheet contains 0.5 to 15 wt.% of a rubber component, from 0.5 to 2.0 wt.% of a nucleating agent, has a uniform thickness of from 0.060 to 0.250 inches with a tolerance of ~ 0.10 inches, a density in the range of 4 to 18 lb/ft3, and an average cell size of 0.12 to 0.34 mm. Optionally, one or more films (22) may be extrusion coated or laminated to the foam sheet prior to thermoforming. The resulting deep drawn articles have draw ratios greater than 1.0, have good heat insulation capacity with an attractive appearance.

L'invention concerne une feuille (A) de mousse de polystyrène permettant un thermoformage profond d'articles, et qui comprend 0,5 à 15 % en poids d'un composant caoutchouc, et 0,5 à 2,0 % en poids d'un agent de nucléation. Cette feuille possède une épaisseur uniforme comprise entre 0,060 et 0,250 pouces avec une tolérance de ± 0,10 pouces, une densité comprise entre 4 et 18 livres par pied cube, et une dimension alvéolaire moyenne comprise entre 0,12 et 0,34 mm. Eventuellement, on peut, avant thermoformage, revêtir ou stratifier par extrusion la feuille de mousse d'une ou plusieurs pellicules (22). Les articles ainsi obtenus ont des rapports d'étirage supérieurs à 1,0, une bonne capacité d'isolation thermique et un aspect agréable.

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