Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1985-03-04
1986-07-29
Van Balen, William J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
128156, 4283166, 4283171, 4283191, B32B 518
Patent
active
046030760
ABSTRACT:
MDI-based prepolymers are blown with a substantially nonaqueous blowing agent, such as pressurized air, an polymerized with stoichiometric amounts of polyoxyethylene polyol having at least two hydroxyl equivalents per mole, yielding a hydrophilic foam. The present foams may be extruded, knife-coated or otherwise cast into sheets, or may be fabricated by other known foam preparation techniques. Because the foam is polymerized with polyoxyethylene polyol instead of water, the foam exhibits both superior drape and improved stretch and recovery as compared with prior-art MDI-based flexible foams formed with aqueous reactants. The foam is particularly suited for use in external biomedical applications as, for example, a laminated medical/surgical dressing in which a thin sheet of the hydrophilic foam adheres to a nonstick aluminized veil on one side.
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Hypol Plus Formable Hydrophilic Prepolymers Technical Bulletin, Laboratory Procedures and Foam Formulations, Organic Chemicals Division, W. R. Grace & Co.
Bowditch W. Raymond
Rybalka Borys
Norwood Industries, Inc.
Van Balen William J.
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