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B - Operations – Transporting – 60 – C

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B60C 1/00 (2006.01) C08G 18/32 (2006.01) C08G 18/42 (2006.01) C08L 75/04 (2006.01) C08L 75/06 (2006.01)

Patent

CA 2713875

Polyurethane elastomer articles formed from prepolymer mixtures having free diphenylmethane diisocyanate (MD1) content from 2.0 to 5.0 wt%. based on the weight of the prepolymer mixture. The prepolymer mixtures comprise a polyester, polyether, or polycaprolactone (PCL) prepolymer and MDI. The polyurelhane elastomer articles arc formed by curing the prepolymer mixture with a chain extender, such as a curative comprising a methylenedianiline-sodium chloride complex. The articles have good physical properties that may weigh over 225 kg, and have a three-axis thickness greater than 10.2 cm,

Cette invention concerne des articles à base délastomères de polyuréthane élaborés à partir de mélanges de prépolymères ayant une teneur en diphénylméthane diisocyanate (MDI) libre de 2,0 à 5,0 % en poids par rapport au poids du mélange de prépolymères. Le mélange de prépolymères comprend un prépolymère de polyester, de polyéther ou de polycaprolactone (PCL) et du MDI. Les articles à base délastomères de polyuréthane sont formés en vulcanisant le mélange de prépolymères avec un produit dextension, par exemple un agent vulcanisant comprenant un complexe méthylènedianiline-chlorure de sodium. Les articles présentent de bonnes propriétés physiques susceptibles de dépasser 225 kg et une épaisseur tridimensionnelle supérieure à 10,2 cm.

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