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US 2003/0203182 A1Published application
Foam composite
AssigneeHydrophilix, LLC
InventorTimothy Thomson
Life of this patent
Estimating the term…
Abstract
A foam composite made up of a scaffold of an open cell hydrophobic material having plurality of surfaces defining a plurality of pores, and a coating of a substantially hydrophilic foam material disposed upon the surfaces of the hydrophobic foam. The resulting foam composite exhibits structural characteristics of the hydrophobic foam and absorbency characteristics of the hydrophilic foam.
Claims53
A foam composite comprising:
- a scaffold of an open cell hydrophobic polyurethane foam, said scaffold having a plurality of surfaces defining a plurality of pores;
- and
- a coating of a substantially open cell hydrophilic polyurethane foam disposed upon said plurality of surfaces of said hydrophobic polyurethane foam;
- wherein said foam composite exhibits structural characteristics of said hydrophobic polyurethane foam and absorbency characteristics of said open cell hydrophilic polyurethane foam.
1 more element
A process of making a foam composite which comprises:
- (a) preparing an emulsion of a hydrophilic polyurethane prepolymer which upon curing forms a substantially open cell hydrophilic polyurethane polymer foam;
- (b) contacting an open cell hydrophobic polyurethane foam having a plurality of surfaces defining a plurality of pores with said hydrophilic polyurethane prepolymer emulsion;
- (c) curing said hydrophilic polyurethane prepolymer emulsion while in contact with said hydrophobic polyurethane for a period of time sufficient to form a coating of said substantially open cell hydrophilic polyurethane polymer foam on hydrophobic polyurethane foam without closing the pores of said hydrophobic polyurethane foam.
A process of making a foam composite which comprises:
- (a) preparing a solution of a hydrophilic polyurethane prepolymer which upon curing forms a substantially open cell hydrophilic polyurethane polymer foam and a solvent therefor;
- (b) contacting an open cell hydrophobic polyurethane foam having a plurality of surfaces defining a plurality of pores with said polyurethane prepolymer solution;
- (c) recovering said solvent from said polyurethane prepolymer solution in step (b) and leaving a coating of said hydrophilic polyurethane prepolymer on said open cell hydrophobic polyurethane foam;
- and
- (d) curing said polyurethane prepolymer for a period of time sufficient to form a coating of said substantially open cell hydrophilic polyurethane polymer foam on said hydrophobic polyurethane foam without closing the pores of said hydrophobic polyurethane foam.
2 more elements
A process of making a foam composite which comprises:
- (a) preparing a liquid phase of a hydrophilic polyurethane prepolymer which upon curing forms a substantially open cell hydrophilic polyurethane foam at from about 25° C. to about 40° C.;
- (b) contacting an open cell hydrophobic polyurethane foam having a plurality of surfaces defining a plurality of pores with said liquid phase of a hydrophilic polyurethane prepolymer;
- (c) curing said polyurethane prepolymer for a period of time sufficient to form a coating of said substantially open cell hydrophilic polyurethane polymer foam on said hydrophobic polyurethane foam without closing the pores of said hydrophobic polyurethane foam.
A process of making a foam composite which comprises:
- (a) preparing a scaffold of an open cell hydrophobic polyurethane foam, said scaffold having a plurality of surfaces defining a plurality of pores;
- (b) preparing a hydrophilic polyurethane prepolymer emulsion which upon curing forms a substantially open cell hydrophilic polyurethane foam;
- (c) preparing a hydrogel emulsion;
- (d) mixing said prepolymer emulsion with said hydrogel emulsion to obtain a composite emulsion;
- (e) contacting said scaffold of an open cell hydrophobic polyurethane foam with said composite emulsion;
- and
- (f) curing said composite emulsion while in contact with said reticulated hydrophobic polyurethane to form a coating of said substantially open cell hydrophilic polyurethane polymer foam on said hydrophobic polyurethane foam scaffold without closing the pores of said hydrophobic polyurethane foam.
4 more elements
Dependencies are inferred from the claim text.