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Reticulated polyurethane foams and process for their production

  • US 3,171,820 A
  • Filed: 02/17/1964
  • Issued: 03/02/1965
  • Est. Priority Date: 02/17/1964
  • Status: Expired due to Term
First Claim
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1. A 3-DIMENSIONAL NETWORK OF INTERCONNECTING STRANDS OF POLYURETHANE RESIN FORMED BY THE REACTION OF AN ORGANIC POLYISOCYANATE WITH A POLYMER SELECTED FROM AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF POLYALKYLENE ETHER GLYCOLS, POLYALKYLENE ETHER AMINES PRODUCED BY THE REACTION OF ALKYLENEOXIDES WITH POLYAMINES AND POLYESTERS PRODUCED BY THE REACTION OF POLYHYDRIC ALCOHOLS WITH POLYCARBOXYLIC ACIDS, SAID STRANDS BEING INTEGRALLY INTERCONNECTED BY THICKENED NEXUS AT SPACED APART POINTS SO AS TO FORM THE ISOTROPIC SKELETAL OUTLINE OF A MULTITUDE OF POLYHEDRONS WHOSE FACES ARE POLYGONAL, ARE COMMON TO A POLYHEDRON ADJACENT THERETO AND ARE OPEN AND FREE FROM MEMBRANEOUS POLYURETHANE RESIN, SAID NETWORK BEING SUBSTANTIALLY FREE FROM PERMEATOIDALLY DEGRADED STRANDS AND NEXUS.

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