Polyurethane elastomers having improved hydrolysis resistance
AssigneeHuntsman International LLC
InventorsNai Wen Lin, Ravi R. Joshi
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Abstract
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.
Claims17
A polyurethane elastomer having improved hydrolysis resistance comprising the reaction product of
- a first component comprising a polyol blend having
- an aliphatic dicarboxylic acid based polyester polyol,
- an aromatic dicarboxylic acid based polyester polyol,
- chain extender and a blowing agent, and
- a second component having an isocyanate terminated prepolymer, wherein in the first component, the aromatic dicarboxylic acid based polyester polyol is the reaction product of an aliphatic alcohol and ortho-phthalic acid, and wherein the aromatic dicarboxylic acid based polyol is present in the polyol blend in an amount of about 12 wt. % to about 26 wt. % based on the total weight of the polyester polyols.
A polyurethane elastomer having improved hydrolysis resistance comprising the reaction product of
- a first component comprising a polyol blend having
- an ortho-phthalic acid based polyester polyol formed as the reaction product of diethylene glycol with ortho-phthalic acid, the ortho-phthalic acid being substantially free of each of tere-phthalic acid and isophthalic acid, the ortho-phthalic acid based polyester polyol being about 15 wt. % to about 20 wt. % of the total weight of the polyester polyols,
- an adipic acid based polyester polyol formed as the reaction product of adipic acid and a mixture of ethylene glycol and diethylene glycol, and
- water as a blowing agent, and
- a second component that is a diphenylmethane diisocyanate prepolymer having about 15% to about 24% NCO.
Dependencies are inferred from the claim text.