Process for preparing compact expandable urethane foams

• US 3,306,966 A
• Filed: 04/08/1963
• Issued: 02/28/1967
• Est. Priority Date: 06/15/1962
• Status: Expired due to Term

• Current Assignee: Franz Matejcek, Helmut Pietsch, Kurt Sponsel, Walter Leupold Curt
• Original Assignee: Franz Matejcek, Helmut Pietsch, Kurt Sponsel, Walter Leupold Curt
• Inventors: FRANZ MATEJCEK, KURT SPONSEL, HELMUT PIETSCH, WALTER LEUPOLD CURT
• Application Number:
  US04/271,483
• Time in Patent Office: 1,422 Days
• US Class Current: 264/321
• CPC Class Codes: C08J 2375/04 Polyurethanes
• CPC Class Codes: C08J 2401/00 Characterised by the use of cellulose, modified cellulose or cellulose derivatives
• CPC Class Codes: C08J 2471/00 Characterised by the use of polyethers obtained by reactions forming an ether link in the main chain; Derivatives of such polymers
• CPC Class Codes: C08J 9/40 Impregnation
• CPC Class Codes: C08J 9/42 with macromolecular compounds
• CPC Class Codes: Y10S 57/907 Foamed and/or fibrillated

Claims

1. PROCESS FOR PREPARING COPACT, EXPANDABLE POLYURETHANE FOAMS WHICH COMPRISES IMPREGNATING SAID FOAM WITH A DEFATIGUING AGENT, COMPRESSING THE THUS IMPREGNATED FORM, APPLYING A FIXATING AGENT TO SAID COMPRESSED FOAM WHEREBY THE FOAM RETAINS COMPRESSED FORM