Granted Patent B2

US 7,138,458 · App. 10/964,431 · Granted Nov 21, 2006

Abstract

Claims (11)

1. A method for preparing a two-phase, water-absorbent bioadhesive composition comprising:

(a) preparing a crosslinkable hydrophobic composition comprised of a hydrophobic polymer and at least one agent effective to crosslink the polymer; and

(b) preparing a hydrophilic composition comprised of a hydrophilic polymer and a complementary oligomer capable of crosslinking the hydrophilic polymer through hydrogen bonding, ionic bonding, and/or covalent bonding;

(c) admixing the crosslinkable hydrophobic composition with the hydrophilic composition; and

(d) crosslinking the hydrophobic polymer in the admixture.

2. The method of claim 1 , wherein the complementary oligomer is effective to crosslink the hydrophilic polymer in the presence of a curing agent.

3. The method of claim 2 , wherein (d) further includes crosslinking the hydrophilic polymer.

4. The method of claim 3 , wherein (d) is carried out at a temperature effective to thermally crosslink both the hydrophobic polymer and the hydrophilic polymer.

5. The method of claim 4 , wherein the hydrophobic polymer is butyl rubber and the at least one agent comprises polyisobutylene.

6. The method of claim 5 , wherein the at least one agent additionally comprises an organic peroxide.

7. The method of claim 4 , wherein the curing agent is pentaerythritol monohydroxypentaacrylate.

Assignments (14)