Foams having increased heat distortion temperature made from...

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 9/00 (2006.01) C08J 9/14 (2006.01) C08L 25/00 (2006.01) C08L 25/06 (2006.01) C08L 25/08 (2006.01) C08L 23/08 (2006.01)

Patent

CA 2353098

The present invention pertains to improved alkenyl aromatic polymer foams (and processes for their preparation) having increased heat distortion temperature and improved dimensional stability while maintaining good tensile/tear, creep and environmental dimensional change properties. The closed cell low density alkenyl aromatic polymer foams exhibit increased heat distortion temperature, when substantially random interpolymers of 21 to 65 mol percent styrene are blended in. When these same alkenyl aromatic polymer foams are made without these interpolymers, the heat distortion temperature is not improved.

La présente invention concerne des mousses améliorées en polymère alcényle aromatique (et leurs procédés de préparation) présentant une température de déformation thermique supérieure et une meilleure stabilité dimensionnelle tout en conservant de bonnes propriétés de traction/déchirure, de fluage et de changement dimensionnel environnemental. Les mousses en polymère alcényle aromatique basse densité à alvéoles fermées présentent une température de déformation thermique supérieure, lorsque des interpolymères sensiblement aléatoires de styrène de 21 à 65 mol pour cent sont mélangés. Lorsque l'on produit ces mêmes mousses en polymère alcényle aromatique sans ces interpolymères, la température de déformation thermique n'est pas améliorée.

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