×

PVA hydrogel

  • US 7,235,592 B2
  • Filed: 10/12/2004
  • Issued: 06/26/2007
  • Est. Priority Date: 10/12/2004
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method of making a covalently cross-linked vinyl polymer hydrogel comprising the steps of:

  • providing a physically associated vinyl polymer hydrogel having a crystalline phase;

    exposing the physically associated vinyl polymer hydrogel to an amount of ionizing radiation providing a radiation dose in the range of about 1-1,000 kGy effective to form covalent crosslinks; and

    removing physical associations by exposing the irradiated vinyl polymer hydrogel to a temperature above the melting point of the physically associated crystalline phase to produce a covalently cross-linked vinyl polymer hydrogel.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×