Rigid urethane foams using saccharides as reactive components

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/42 (2006.01) C08G 18/32 (2006.01) C08G 18/64 (2006.01) C08G 18/66 (2006.01)

Patent

CA 2512186

Rigid urethane foams made from polyester polyols and processes for producing them are provided. The foams are made by reacting a mixture that comprises an aromatic polyester polyol having an average functionality of about 3.0 or less, a hydroxyl number above 100 mg/KOH/g, and an average molecular weight less than 3000; from about 1 weight percent to about 30 weight percent of a saccharide; a blowing agent; and an isocyanate, and said foams having an isocyanate index from about 0.8 to about 3Ø The foams have a high closed cell content and a high free rise compressive strength and slightly lower thermal resistance than expected for their density.

L'invention concerne des mousses d'uréthane rigides fabriquées à partir de polyols de polyester, ainsi que des procédés permettant de les produire. Les mousses décrites dans cette invention sont obtenues par réaction d'un mélange comprenant un polyol de polyester aromatique ayant une fonctionnalité moyenne égale ou inférieure à environ 3.0, un nombre d'hydroxyles supérieur à 100 mg/KOH/g, et un poids moléculaire moyen inférieur à 3000 M¿r?; d'environ 1 à environ 30 % en poids de saccharide; un agent gonflant; et un isocyanate. Ces mousses présentent un indice d'isocyanate de 0.8 environ à 3.0 environ. Les mousses décrites dans cette invention présentent une teneur élevée en alvéoles fermées et une résistance à la compression du gonflement sans contrainte élevée, ainsi qu'une résistance thermique légèrement plus faible que prévue pour leur densité.

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