Low density polyurethane foam systems with high split tear
AssigneeBASF SE
InventorsCai An Wang, Chang Xi Li, Ren Zheng Zhang
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Abstract
Described herein is a polyurethane foam produced in a “one shot process” that has low density, is semi-hard, and displays a high rebound value all while providing superior split tear performance. The polyurethane foam can be used in a “one shot process” to produce a shoe sole, a mid-sole or an insole for a shoe. The shoe sole may be used for forming an outer sole of a sandal type shoe, a midsole of an athletic type shoe, or an insole for insertion into any type of shoe.
Claims15
A polyurethane foam having a density of 150 to 400 g/L measured according to DIN EN ISO 845, wherein the polyurethane foam is formed by reacting a mixture consisting of:
- 80 to 50 weight percent (wt. %) of a polyol formulation and 20 to 50 wt. % of an isocyanate prepolymer, wherein the wt. % is based on the total weight of the mixture;
- wherein the polyol formulation comprises 90 to 98 wt. % of a polytetramethylene ether glycol (PTMEG) with a weight average molecular weight (MWw) of 1800 to 2100, 0.1 to 6 wt. % of expandable microspheres and 0.5 to 3 wt. % of water, wherein the wt. % values for the polyol formulation are based on the total weight of the polyol formulation.
Dependencies are inferred from the claim text.