| 摘要 |
HEAT SEALABLE MEMBRANE FOR TRANSDERMAL DRUG RELEASE A transdermal drug delivery system, is provided which includes, in combination, an impermeable backing member, a release rate controlling membrane and a reservoir containing a medicinally active ingredient; the improvement in such system is based on the fact that said membrane is heat and pressure sealed to said backing without the u e of a separate adhesive and is formed of a substantially linear block copolymer which is a reaction product of an amino functional polydiorganosiloxane which forms soft segments in said reaction product ant a diisocyanate which forms "hard" segments, said copolymer having a glass transition temperature between 50.degree.C. and 200.degree.C., said soft segments comprising from 60 to 90 percent by weight, based on the weight of said copolymer. |
