Aderent, flexible hydrogel and medicated coatings
A coating and coating technology, used in coatings, medical containers, drug combinations, etc., can solve problems such as excessive friction, difficult substrate adhesion, uncontrollable coating lubrication and wet abrasion resistance, etc. Good tolerance, enhanced flexibility and stickiness
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Embodiment 1
[0074] Polyurethane tubing was dip-coated with the following solutions and then dried at 85°C for 45 minutes. PVP 0.289 Benzyl Alcohol 1.563 Ethanol 2.801 Cyclohexanone 5.347 Hydroxy-functional Acrylate Polymer 0.050 Xylene 0.050
[0075]Result: Use a knife to cut along the coating, then immerse the coating in water, and rub the cut vigorously with your fingers to test the viscosity of the coating. There was no loss of tack (ie, peeling back) after the wet rub test. Next, to test the dry tack of the coating, a tape of Universal Tape 83436 (United Stationers Supply, Co.) was pressed firmly on the coating and then the tape was quickly peeled off. Coatings were not removed by this test. The samples showed no loss of tack in the tape test. The coating has good lubricity when wet.
Embodiment 2
[0077] Oxygen plasma-treated polyethylene pipes were dip-coated with the following solutions and then dried at 85°C for 45 minutes. 5% (w / w) ethylene acrylic acid copolymer in THF 15.0 cyclohexanone 4.0 hydroxy-functional acrylate polymer 0.24 melamine resin 0.0680% (w / w) isocyanate polymer in THF 0.32 trichloroacetic acid 0.20
[0078] After oven drying, the samples were dip-coated with the following solutions and then dried at 80°C for 1 hour. THF 74.00 Xylene 0.25 Acrylate Copolymer with Carboxyl Function 13.88 Epoxy Resin 0.75 White Spirit 150 Solvent 9.73 Butyl Cellosolve 1.39
[0079] Next, samples were coated with the following hydrogel solutions by dipping and then dried at 80°C for 1 hour. Butyrolactone 1.80 Dimethylacetamide 1.20 Ethanol 8.75PVP 0.25THF 0.60 Xylene 0.05 Epoxy resin 0.10 Polyamide resin 0.05
[0080] Results: As evidenced by the test in Example 1, the coating exhibited good dry tack, good lubricity, and good wet rub resistance.
Embodiment 3
[0081] Embodiment 3 (contrast)
[0082] In this example, the improved coating of the present invention is compared with the PVP-cellulose ester coating of USP5,331,027, and the results show that the coating of the present invention has excellent viscosity. Silicone tubing samples were treated with oxygen plasma. The following solutions were then applied by dipping and dried at 80°C for 120 minutes. Acrylic Copolymer with Carboxyl Functionality 5.0 Petroleum Solvent 150 Solvent 3.5 Butyl Cellosolve 0.5THF 27.75 Epoxy Resin 0.56 Xylene 0.19
[0083] Next, Sample A was coated with the same hydrogel solution as used in Example 2 by dipping. Sample B was dip coated with the following solution for a control (an example of a PVP-cellulose ester formulation of USP 5,331,027) and then dried at 80°C for 2 hours. PVP 31.74 Ethanol 462.01 Butyrolactone 103.75 Cyclohexanone 12.82 Nitrocellulose 0.008
[0084] Results: The two coating samples were tested as in Example 1. Sample A, coat...
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