Hormone-containing transdermal therapeutic system with an active substance reservoir based on vinylacetate-vinylpyrrolidone copolymer with improved cohesion
First Claim
1. Transdermal therapeutic system in the form of a plaster, for the controlled delivery of estrogens and/or gestagens to human or animal skin, said system having a backing layer, an active substance-containing, mono- or multilayer reservoir connected thereto, and a detachable protective layer, characterized in that the active substance-containing reservoir contains vinyl pyrrolidone-vinyl acetate copolymer and cohesion-enhancing substances, said cohesion-enhancing substances being selected from the group consisting of polyethylene, polypropylene, salts of ethylene-methacrylic acid copolymers, polystyrene, polybutene, polyisobutylene, styrene-butadiene-styrene block polymers, polyvinyl chloride, polyvinylidene chloride, polyurethane, polyamide, polysulfone, polyvinyl acetate, polyvinyl alcohol, polyethylene glycol, polyoxyethylene, polyvinyl butyral, and ethylene-vinyl acetate copolymers.
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Accused Products
Abstract
A transdermal therapeutic system in patch form for the controlled delivery of active substances to the human or animal skin comprises a backing layer, an active substance-containing reservoir attached thereto and a detachable protective layer, is characterized in that the active substance-containing reservoir contains as main components thereof at least one film former as well as at least one polymer which prevents or suppresses the crystallisation of the active substance or active substances.
52 Citations
22 Claims
- 1. Transdermal therapeutic system in the form of a plaster, for the controlled delivery of estrogens and/or gestagens to human or animal skin, said system having a backing layer, an active substance-containing, mono- or multilayer reservoir connected thereto, and a detachable protective layer, characterized in that the active substance-containing reservoir contains vinyl pyrrolidone-vinyl acetate copolymer and cohesion-enhancing substances, said cohesion-enhancing substances being selected from the group consisting of polyethylene, polypropylene, salts of ethylene-methacrylic acid copolymers, polystyrene, polybutene, polyisobutylene, styrene-butadiene-styrene block polymers, polyvinyl chloride, polyvinylidene chloride, polyurethane, polyamide, polysulfone, polyvinyl acetate, polyvinyl alcohol, polyethylene glycol, polyoxyethylene, polyvinyl butyral, and ethylene-vinyl acetate copolymers.
Specification