Crosslinked PVP-I2 foam product

• US 5,672,634 A
• Filed: 12/23/1996
• Issued: 09/30/1997
• Est. Priority Date: 12/23/1996
• Status: Expired due to Fees

• Current Assignee: ISP Capital, Inc. (Ashland Global Holdings, Inc.)
• Original Assignee: ISP Investments, Inc. (Ashland Global Holdings, Inc.)
• Inventors: Tseng, Susan Y., Wolf, Philip F.
• Primary Examiner(s): Foelak, Morton
• Application Number:
  US08/774,064
• Time in Patent Office: 281 Days
• Field of Search: 521/53, 521/142
• US Class Current: 521/53
• CPC Class Codes: A01N 2300/00 Combinations or mixtures of active ingredients covered by classes A01N27/00 - A01N65/48 with other active or formulation relevant ingredients, e.g. specific carrier materials or surfactants, covered by classes A01N25/00 - A01N65/48
• CPC Class Codes: A01N 25/16 Foams
• CPC Class Codes: A01N 59/12 Iodine, e.g. iodophors; Compounds thereof
• CPC Class Codes: C08J 2339/06 Homopolymers or copolymers of N-vinyl-pyrrolidones
• CPC Class Codes: C08J 9/40 Impregnation

Abstract

A crosslinked PVP-I₂ foam product, useful as an iodophor, contains about 0.1-2% crosslinker and about 16-18% total inorganic iodine.

Claims

1. A process of making a crosslinked PVP-I₂ foam product which comprises forming a shaped crosslinked PVP polymer hydrogel substantially free of residual monomer and non-crosslinked PVP, conditioning the hydrogel with moisture and acid, and then reacting the conditioned polymer with iodine crystals.

2. A process according to claim 1 wherein said product is 0.1-2% crosslinked and contains about 16-18% total inorganic I₂.

3. A process according to claim 1 wherein said iodine is reacted at about 45°

C. for about 3-12 hours, then at 90°

C. for about 6-12 hours.

4. A process according to claim 1 in which the shaped crosslinked PVP hydrogel is made by polymerization of VP monomer in water in the presence of EVP as crosslinker and an initiator.