Absorbent polymer compositions, medical articles, and methods
First Claim
Patent Images
1. An absorbent polymer composition comprising:
- a polymeric material;
absorbent particles; and
thermally cxpandable microspheres, wherein a thermally expandable microsphere comprises a thermoplastic polymeric shell and a core that includes a liquid and/or gas.
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Abstract
An absorbent polymer composition, which can be in the form of a foam, that includes a polymeric material, absorbent particles and thermally expandable (or expanded) microspheres.
124 Citations
34 Claims
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1. An absorbent polymer composition comprising:
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a polymeric material; absorbent particles; and thermally cxpandable microspheres, wherein a thermally expandable microsphere comprises a thermoplastic polymeric shell and a core that includes a liquid and/or gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 26, 27, 32)
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10. An absorbent polymer foam composition comprising:
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a polymeric material; absorbent particles; and thermally expanded microspheres prepared from thermally expandable microspheres, wherein a thermally expandable microsphere comprises a thermoplastic polymeric shell and a core that includes a liquid and/or gas. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 28, 29, 33)
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18. An absorbent polymer foam composition comprising:
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a polymeric material; a hydrocolloid comprising superabsorbent particles; and thermally expanded microspheres prepared from thermally expandable microspheres, wherein a thermally expandable microsphere comprises a thermoplastic polymeric shell and a core that includes a liquid and/or gas; wherein the polymer foam has a density of less than 0.8 gram per cubic centimeter. - View Dependent Claims (30, 31, 34)
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19. An absorbent polymer foam composition preparable by a method comprising:
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combining a polymeric material, absorbent particles, and thermally expandable microspheres at a temperature below the expansion temperature of the microspheres to form a mixture, wherein a thermally expandable microsphere comprises a thermoplastic polymeric shell and a core that includes a liquid and/or gas; and increasing the temperature of the mixture above the expansion temperature of the thermally expandable microspheres to form an absorbent polymer foam. - View Dependent Claims (20, 21, 22, 23)
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24. A method of making an absorbent polymer foam composition, wherein the method comprises:
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combining a polymeric material, absorbent particles; and
thermally expandable microspheres to form a mixture in an extruder at a temperature below the expansion temperature of the microspheres, wherein a thermally expandable microsphere comprises a thermoplastic polymeric shell and a core that includes a liquid and/or gas; andincreasing the temperature of the mixture above the expansion temperature of the thermally expandable microspheres during extrusion. - View Dependent Claims (25)
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Specification