Methods for the preparation of non-stringy adhesive hydrophilic gels
First Claim
1. A method for the preparation of a non-stringy adhesive hydrophilic gel comprising:
- (a) forming a liquid film comprising a homogeneous mixture of water and at least one water-soluble polymer present at a concentration of at least about 7 percent by weight of said mixture, said water-soluble polymer having a weight average molecular weight of at least about 200 kD;
(b) exposing said film to a dose of radiant energy within an area of a plot of radiation dose versus polymer concentration whose upper and lower boundaries are defined by the equations NS(C) and A(C), respectively;
Lower Dose, A(C), >
1.245+0.0373C-3.908/CUpper Dose, NS(C), ≦
2,039+0.1598C-8.183/Cin which C is the concentration of the polymer expressed as a weight fraction of the total mixture, which dose is effective to provide a non-stringy hydrophilic gel which exhibits a sharp, substantially featureless force-displacement profile, has an Adhesion Energy Density (AED) of at least about 5 to less than about 50 g/cm and has a peak-force value of at least about 180 grams.
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Abstract
A method is disclosed for the preparation of non-stringy hydrogels that are comprised of a homogeneous uniform mixture of water and at least one water-soluble high molecular weight polymer. Suitable mixtures may be derived from poly(ethylene oxide) and water or poly(vinyl pyrrolidone), a viscosity enhancing hydrophilic polymer and water, and further, may optionally contain an effective amount of a water-soluble electrolyte to provide conductive non-stringy materials. These polymeric mixtures are crosslinked by exposure to radiant energy to provide gel-like solids which are sufficiently tacky and adhesive to adhere to the subjects'"'"' skin and yet are substantially non-stringy and non-aggressive such that contact with such hydrogels imparts less discomfort to the user. In addition, the consumer utilizing the products of this invention would not experience the objectionable sticky, stringy sensation associated with existing adhesive gels.
142 Citations
34 Claims
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1. A method for the preparation of a non-stringy adhesive hydrophilic gel comprising:
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(a) forming a liquid film comprising a homogeneous mixture of water and at least one water-soluble polymer present at a concentration of at least about 7 percent by weight of said mixture, said water-soluble polymer having a weight average molecular weight of at least about 200 kD; (b) exposing said film to a dose of radiant energy within an area of a plot of radiation dose versus polymer concentration whose upper and lower boundaries are defined by the equations NS(C) and A(C), respectively; Lower Dose, A(C), >
1.245+0.0373C-3.908/CUpper Dose, NS(C), ≦
2,039+0.1598C-8.183/Cin which C is the concentration of the polymer expressed as a weight fraction of the total mixture, which dose is effective to provide a non-stringy hydrophilic gel which exhibits a sharp, substantially featureless force-displacement profile, has an Adhesion Energy Density (AED) of at least about 5 to less than about 50 g/cm and has a peak-force value of at least about 180 grams. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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2. A method for the preparation of a non-stringy adhesive hydrophilic gel comprising:
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(a) forming a liquid film comprising a homogeneous mixture of water and at least one water-soluble polymer present at a concentration of at least about 7 percent by weight of said mixture, said water-soluble polymer having a weight average molecular weight of at least about 200 kD; (b) exposing said film to a dose of radiant energy within an area of a plot of radiation dose versus polymer concentration whose upper and lower boundaries are defined by the equations NS(C) and A(C), respectively; Lower Dose, A(C), >
1.245+0.0373C-3.908/CUpper Dose, NS(C), ≦
2,039+0.1598C-8.183/Cin which C is the concentration of the polymer expressed as a weight fraction of the total mixture, which dose is effective to provide a non-stringy adhesive hydrophilic gel (i) having a gel fraction in the Polymer Extraction Test of at least about 0.8;
(ii) having an Adhesion Energy Density in the Adhesion Energy Density Determination Test of at least about 5 g/cm but not exceeding about 50 gm/cm;
(iii) which gives a rolling ball distance of at least about 10 mm in the Tack Rolling Ball Method in which the ball employed has a diameter of 16.5 mm; and
(iv) has a peak-force value of at least about 180 grams.
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Specification