Water-swellable composite sheet of microfibers of PTFE and hydrophilic absorptive particles
First Claim
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1. A composite sheet material comprising:
- (a) a network of interlaced microfibrous polytetrafluoroethylene forming a fibril matrix, and(b) 1.0 to 10 parts of hydrophilic absorptive particles per part of PTFE by weight enmeshed in said matrix, the absorptive particles having absorptive capacity greater than 1.0 gram of water per gram of dry particles,wherein substantially all of said hydrophilic absorptive particles are unavailable for sloughing.
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Abstract
A composite sheet material is highly absorbent toward aqueous fluids including blood and exudate and comprises a polytetrafluoroethylene fibril matrix and hydrophilic absorptive particles enmeshed in the matrix. The composite sheet material is useful as a wound dressing, as a drying material for non-aqueous solvents, and as a chromatographic material.
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Citations
16 Claims
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1. A composite sheet material comprising:
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(a) a network of interlaced microfibrous polytetrafluoroethylene forming a fibril matrix, and (b) 1.0 to 10 parts of hydrophilic absorptive particles per part of PTFE by weight enmeshed in said matrix, the absorptive particles having absorptive capacity greater than 1.0 gram of water per gram of dry particles, wherein substantially all of said hydrophilic absorptive particles are unavailable for sloughing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of removing water from non-aqueous solvents comprising the steps:
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(1) passing said solvent over or through a composite sheet material comprising; (a) a network of interlaced microfibrous polytetrafluoroethylene forming a fibril matrix; and (b) 1.0 to 10 parts of hydrophilic absorptive particles per part of PTFE by weight enmeshed in said matrix, the absorptive particles having absorptive capacity greater than 1.0 grams of water per gram of dry particles, wherein substantially all of said hydrophilic absorptive particles are unavailable for sloughing, and (2) recovering the resulting aqueous-free solvent.
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16. A chromatographic sheet material comprising:
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(a) a network of interlaced microfibrous polytetrafluoroethylene forming a fibril matrix, and (b) 1.0 to 10 parts of hydrophilic absorptive particles per part of PTFE by weight enmeshed in said matrix, the absorptive particles having absorptive capacity greater than 1.0 gram of water per gram of dry particles, wherein substantially all of said hydrophilic absorptive particles are unavailable for sloughing.
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Specification