Claims
- 1. A method of preparing a hydrophilic, pressure-sensitive adhesive composition comprising steps of:
- (a) irradiating non-crosslinked poly(N-vinyl lactam) while in a solid form unmixed with plasticizer, with ionizing radiation to crosslink the solid poly(N-vinyl lactam), and
- (b) mixing the solid, radiation-crosslinked poly(N-vinyl lactam) with an essentially unirradiated plasticizer in an amount sufficient to form a cohesive and pressure-sensitive adhesive composition.
- 2. The method according to claim 1, wherein the ionizing radiation comprises alpha, beta, gamma, electron-beam, or x-ray radiation.
- 3. The method according to claim 1, wherein the ionizing radiation is irradiated in at least one dose cumulatively comprising from about 25 kGys. to about 400 kGys.
- 4. The method according to claim 1, wherein the ionizing radiation is irradiated in at least one dose cumulatively comprising from about 25 to about 200 kGys.
- 5. The method according to claim 1, wherein the ionizing radiation is irradiated in at least one dose cumulatively comprising at least about 100 kGys.
- 6. The method according to claim 1, further comprising the step (c) of optionally mixing an electrolyte, an antimicrobial agent, or a pharmaceutical into the composition.
- 7. The method according to claim 6, further comprising the step (d) of mixing the radiation-crosslinked poly(N-vinyl lactam), the essentially unirradiated plasticizer, and optional electrolyte, antimicrobial agent, or pharmaceutical into a solvent; the step (e) of casting the composition in solvent onto a substrate; and the step (f) of evaporating solvent.
Parent Case Info
This is a division of application Ser. No. 07/792,442 filed Nov. 15, 1991, now U.S. Pat. No. 5,2760,079.
US Referenced Citations (29)
Foreign Referenced Citations (2)
Number |
Date |
Country |
0107376 |
May 1984 |
EPX |
0184470 |
Nov 1986 |
EPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
792442 |
Nov 1991 |
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