Polyurethane elastomers having improved hydrolysis resistance

Details Polyurethane elastomers having improved hydrolysis resistance Polyurethane elastomers having improved hydrolysis resistance

C - Chemistry, Metallurgy

08

G

C08G 18/42 (2006.01) C08G 18/10 (2006.01) C08G 18/66 (2006.01)

Patent

CA 2361104

The disclosed invention relates to a polyurethane elastomer that has improved hydrolysis resistance. The polyurethane elastomer is made by reacting a polyol blend of an aromatic dicarboxylic acid based polyester polyol, an aliphatic dicarboxylic acid based polyester polyol, and a blowing agent. The polyol blend is reacted with an isocyanate terminated prepolymer. The aromatic dicarboxylic acid based polyester polyol is the reaction product of an aliphatic alcohol and ortho-phthalic acid. The aliphatic dicarboxylic acid based polyester polyol is the reaction product of adipic acid and glycols.

L'invention a trait à un élastomère de polyuréthanne qui présente une résistance accrue à l'hydrolyse. L'élastomère de polyuréthanne est élaboré par la mise en réaction d'un mélange de polyols composé d'un polyol de polyester à base d'acide dicarboxylique aromatique, d'un polyol de polyester à base d'acide dicarboxylique aliphatique et d'un agent d'expansion. Le mélange de polyols est mis à réagir avec un prépolymère à terminaison isocyanate. Le polyol de polyester à base d'acide dicarboxylique aromatique est le produit de réaction d'un alcool aliphatique et d'un acide ortho-phtalique. Le polyol de polyester à base d'acide dicarboxylique aliphatique est le produit de réaction d'acide adipique et de glycols.

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