Flexible open-cell polyurethane foam

{
  "publication_number": "US5607982A",
  "country": "US",
  "kind": "A",
  "title": "Flexible open-cell polyurethane foam",
  "abstract": "A flexible open-cell polyurethane is described that is the reaction product of a mixture comprising (a) a polyisocyanate component comprising monomeric or polymeric MDI, and (b) a polyol component having at least 50% of its 0H functional groups as secondary OH groups.",
  "claims": [
    "1. A method of preparing a flexible open-cell polyurethane foam comprising the steps of (a) mixing (1) a polyisocyanate component comprising monomeric or polymeric MDI, and (2) a polyol component having at least 50% of its OH functional groups as secondary OH groups to form a polyurethane reaction mixture and filling a dispensing trough having an overflow weir with said polyurethane reaction mixture, (b) causing the polyurethane mixture to flow across the overflow weir, thereby applying the polyurethane reaction mixture onto a moving substrate to form a polyurethane bun, and (c) removing the polyurethane bun from the substrate.",
    "2. A method of preparing a flexible open-cell polyurethane foam according to claim 22 wherein the polyol component has an equivalent weight of from 700 to 2500.",
    "3. A method of preparing a flexible open-cell polyurethane foam according to claim 24 wherein the polyol component has an equivalent weight of 1000 to 2000.",
    "4. A method of preparing a flexible open-cell polyurethane foam according to claim 2 wherein the polyol component comprises a dispersion of polymer particles dispersed in a carrier polyol.",
    "5. A method of preparing a flexible open-cell polyurethane foam according to claim 2 wherein the polyol component comprises a dispersion of polymer particles dispersed in a carrier polyol.",
    "6. A method of preparing a flexible open-cell polyurethane foam according to claim 5 wherein the polymer particles are a copolymer of acrylonitrile and styrene.",
    "7. A method of preparing a flexible open-cell polyurethane foam according to claim 6 wherein the ratio of acrylonitrile to styrene is between 4:1 and 1:4.",
    "8. A method of preparing a flexible open-cell polyurethane foam according to claim 1 wherein the polyol component has an average hydroxyl functionality of 2 to 4.",
    "9. A method of preparing a flexible open-cell polyurethane foam according to claim 6 wherein the polyol component has an OH number of 20 to 60.",
    "10. A method of preparing a flexible open-cell polyurethane foam according to claim 1 wherein said polyol component comprises a polyether polyether polyol having an equivalent weight of from 1000 to 2000.",
    "11. A method of preparing a flexible open-cell polyurethane foam according to claim 9 wherein said polyether polyol comprises from 5 to 20% ethylene oxide units and is at least partially capped with propylene oxide.",
    "12. A method of preparing a flexible open-cell polyurethane foam according to claim 1 wherein said polyol component has 70-100% of its OH functional groups as secondary OH groups.",
    "13. A method of preparing a flexible open-cell polyurethane foam according to claim 12 wherein the polyol component is a polyether polyol and said secondary OH groups are derived from propylene oxide capping groups.",
    "14. A method of preparing a flexible open-cell polyurethane foam according to claim 12 wherein 100% of the polyol component's OH functional groups are secondary OH groups.",
    "15. A method of preparing a flexible open-cell polyurethane foam according to claim 14 wherein the polyol component is a polyether polyol and said secondary OH groups are derived from propylene oxide capping groups.",
    "16. A method of preparing a flexible open-cell polyurethane foam according to claim 1 wherein said polyisocyanate component further comprises TDI.",
    "17. A method of preparing a flexible open-cell polyurethane foam according to claim 1 wherein the foam thereby produced has a density of at least 3 lbs/ft 3.",
    "18. A method of preparing a flexible open-cell polyurethane foam according to claim 16 wherein the foam thereby produced has a catastophic fatigue of at least 65% retained at 65% IFD.",
    "19. A method of preparing a flexible open-cell polyurethane foam according to claim 1 wherein the foam thereby produced has a catastophic fatigue of at least 65% retained at 65% IFD.",
    "20. A method of preparing a flexible open-cell polyurethane foam according to claim 1 wherein the foam thereby produced has a tensile strength of at least 35.0 psi."
  ],
  "cpc": [
    "C08G 18/48",
    "C08G 18/4845",
    "C08G 18/632",
    "C08G 2110/0008",
    "C08G 2110/005",
    "C08G 2110/0083"
  ],
  "assignees": [
    "BASF CORP"
  ],
  "filing_date": "1996-01-31",
  "publication_date": "1997-03-04",
  "grant_date": "1997-03-04",
  "priority_date": "1994-07-11",
  "application_number": "US-59454596-A",
  "family_id": "23039957",
  "citations": [
    "GB794403A",
    "US3380967A",
    "US3632707A",
    "US4074960A",
    "US4230823A",
    "US4298557A",
    "US4487854A",
    "US4950694A"
  ]
}