Water blocking material
AssigneeArchem Inc.
InventorShinya Kanzaki
Life of this patent
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Abstract
Provided is a water blocking material prepared by reacting and foaming a starting material composition that contains a polyol, a polyisocyanate, a catalyst, a foaming agent, a foam stabilizer and a crosslinking agent, in which the polyol contains a dimer acid polyol, the content of the dimer acid polyol in the starting material composition is 85% by mass or more of the entire polyol, the polyisocyanate contains a diphenylmethane diisocyanate, the content of the diphenylmethane diisocyanate in the starting material composition is 70 to 85% by mass of the entire polyisocyanate, and the foam stabilizer contains a reactive silicone. The water blocking material is excellent in heat resistance and water blocking performance and is further excellent in flexibility.
Claims20
A water blocking material prepared by reacting and foaming a starting material composition that contains a polyol, a polyisocyanate, a catalyst, a foaming agent, a foam stabilizer and a crosslinking agent, wherein:
- the polyol contains a dimer acid polyol,
- the content of the dimer acid polyol in the starting material composition is 85% by mass or more of the entire polyol,
- the polyisocyanate contains a diphenylmethane diisocyanate,
- the content of the diphenylmethane diisocyanate in the starting material composition is 70 to 75% by mass of the entire polyisocyanate,
- the foam stabilizer contains a reactive silicone, and
- the crosslinking agent is a trifunctional crosslinking agent having a trimethylolpropane skeleton.
Dependencies are inferred from the claim text.