Films based on copolymers, their applications in transdermal systems and their processes of preparation
First Claim
1. A film, capable of being used as an active principle matrix in a transdermal system, comprising:
- a hydrophobic ethylene/vinyl acetate polymer containing at least one active principle and composed of 10-50 wt. % of hydrophilic inclusions consisting of a hydrophilic polymer formed from at least one hydrophilic monomer selected from the group consisting of acrylamide, methylolacrylamide, diacetone acrylamide, maleic acid, acrylic acid, fumaric acid, itaconic acid, propylene glycol acrylate, ethylene glycol methacrylate, methacrylamide, methacrylic acid, propylene glycol methacrylate, hydroxyethyl methacrylate, dimethylaminoethyl methacrylate, N-vinylpyrrolidone, vinylacetic acid and vinylsulfonic acids.
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Accused Products
Abstract
Films based on copolymers, their applications in transdermal systems and their processes of preparation. The said films consist of a hydrophobic polymer of ethylene/vinyl acetate (EVA) type containing at least one active principle and composed of 15 to 50% of hydrophilic inclusions formed from at least one hydrophilic monomer chosen from the group which comprises acrylamide, methylolacrylamide, diacetone acrylamide, maleic acid, acrylic acid, fumaric acid, itaconic acid, propylene glycol acrylate, ethylene glycol methacrylate, methacrylamide, methacrylic acid, propylene glycol methacrylate, hydroxyethyl methacrylate, dimethylaminoethyl methacrylate, N-vinylpyrrolidone, vinylacetic acid or vinylsulphonic acids.
70 Citations
44 Claims
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1. A film, capable of being used as an active principle matrix in a transdermal system, comprising:
a hydrophobic ethylene/vinyl acetate polymer containing at least one active principle and composed of 10-50 wt. % of hydrophilic inclusions consisting of a hydrophilic polymer formed from at least one hydrophilic monomer selected from the group consisting of acrylamide, methylolacrylamide, diacetone acrylamide, maleic acid, acrylic acid, fumaric acid, itaconic acid, propylene glycol acrylate, ethylene glycol methacrylate, methacrylamide, methacrylic acid, propylene glycol methacrylate, hydroxyethyl methacrylate, dimethylaminoethyl methacrylate, N-vinylpyrrolidone, vinylacetic acid and vinylsulfonic acids. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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25. A transdermal system comprising:
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an occlusion support, an active principle-containing film comprising a hydrophobic ethylene/vinyl acetate polymer containing at least one active principle and composed of 10-50 wt. % of hydrophilic inclusions consisting of a hydrophilic polymer formed from at least one hydrophilic monomer selected from the group consisting of acrylamide, ethylene glycol acrylate, methylolacrylamide, diacetone acrylamide, maleic acid, acrylic acid, fumaric acid, itaconic acid, propylene glycol acrylate, ethylene glycol methacrylate, methacrylamide, methacrylic acid, propylene glycol methacrylate, hydroxyethyl methacrylate, dimethylaminoethyl methacrylate, N-vinylpyrrolidone, vinylacetic acid and vinyl sulfonic acids, in contact with said support, an adhesive interface in contact with said active principle-containing film, and a protective film in contact with said adhesive interface.
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44. A process for the preparation of an ethylene/vinyl acetate graft copolymer having grafted thereto hydrophilic monomers in the form of a hydrophilic polymer, comprising the steps of:
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(a) irradiating a hydrophobic ethylene/vinyl acetate polymer in the powder, granule, or film form, at a dose between 10-80 kGy, (b) storing the irradiated ethylene/vinyl acetate polymer, (c) contacting said stored irradiated ethylene/vinyl acetate polymer with at least one hydrophilic monomer selected from the group consisting of acrylamide, methylolacrylamide, diacetone acrylamide, maleic acid, acrylic acid, fumaric acid, itaconic acid, propylene glycol acrylate, ethylene glycol methacrylate, methacrylamide, methacrylic acid, propylene glycol methacrylate, hydroxyethyl methacrylate, dimethylaminoethyl methacrylate, N-vinylpyrrolidone, vinylacetic acid, and vinylsulfonic acids to form an ethylene/vinyl acetate copolymer having grafted thereto said hydrophilic monomer in the form of a hydrophilic polymer, to obtain an ethylene/vinyl acetate graft copolymer having a degree of grafting of said hydrophilic polymer of 10-50%, to form a copolymer matrix.
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Specification