Self-lubricating compound for use in hygienic and medical applications, and suppositories made therefrom
Abstract
Abstract A self-lubricating compound especially suitable for hygienic and medical applications, such as for coating tampons and as suppository structures. The compound contains a thermoplastic film-forming water-soluble polymer, a compatible plasticizer for the polymer, and a lubricant. The lubricant is characterized by the ability to form a homogeneous blend, an intimate physical mixture, or a solution with the polymer at elevated temperatures when the blend or solution is in a fluid state while being incompatible therewith at lower temperature when the blend solidifies. In the solidified state of the compound the lubricant may exist as discrete globules dispersed throughout the compound, and the globules which are disposed on and close to the exposed surface of the solidified blend tend to merge whereby a lubricous film is provided on that surface. The compound is thermoplastic and may be cast, thermoformed, hot melt dip-coated, or transfer molded.
Inventors
- 👤 D Hanke
Bibliographic Details
Claims Analysis
Total Claims: 13References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |