Water vapor permeable, pressure sensitive adhesive composition

• US 6,262,329 B1
• Filed: 01/09/1995
• Issued: 07/17/2001
• Est. Priority Date: 02/28/1991
• Status: Expired due to Term

• Current Assignee: National Starch and Chemical Investment Holding Corporation (Ingredion Incorporated)
• Original Assignee: National Starch and Chemical Investment Holding Corporation (Ingredion Incorporated)
• Inventors: Minnigh, Johannes T., Brunsveld, Gerrit H.
• Primary Examiner(s): Prebilic, Paul B.
• Application Number:
  US08/369,944
• Time in Patent Office: 2,381 Days
• Field of Search: 602/52, 602/54, 602/56, 604/307, 523/111, 424/448, 128/849
• US Class Current: 602/54
• CPC Class Codes: A61L 15/58 Adhesives
• CPC Class Codes: C08F 220/1808 C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
• CPC Class Codes: C08L 33/02 Homopolymers or copolymers of acids; Metal or ammonium salts thereof
• CPC Class Codes: C08L 33/06 of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
• CPC Class Codes: C08L 33/14 of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
• CPC Class Codes: C09J 133/066 containing -OH groups

Abstract

A water vapor permeable, pressure sensitive adhesive composition comprising a hydrophilic, all acrylic polymer system, free of additives and having enhanced water vapor transmission which contains a significant high amount of hydroxyalkyl acrylate/methacrylate. This adhesive composition is particularly useful in surgical or medical dressing applications.

Claims

1. A surgical or medical dressing comprising a backing material coated with a continuous water vapor permeable, pressure sensitive adhesive composition comprising a polymer derived from monomes consisting essentially of:

a) from about 50 to 80% by weight of alkyl acrylate or methacrylate wherein the alkyl group contains from about 4 to 12 carbon atoms;

b) from about 20 to 40% by weight of hydroxyalkyl acrylate or methacrylate wherein the alkyl group contains from about 2 to 4 carbon atoms;

c) from about 0 to 35% by weight of alkyl acrylate or methacrylate wherein the alkyl group contains from about 1 to 3 carbon atoms;

d) from about 0 to 10% by weight of glycidyl acrylate or methacrylate; and

e) from about 0 to 10% by weight of acrylic acid, the dressing laving a water vapor transmission rate of at least 1000 liters vapor/m²/24 hours at 40°

C. and 80% relative humidity difference.

2. The surgical or medical dressing of claim 1, wherein the alkyl group in said hydroxyalkyl acrylate or methacrylate has 2 carbon atoms.

3. The surgical or medical dressing of claim 2, wherein the alkyl group of the alkyl acrylate or methacrylate of group a) contains 4 to 8 atoms.

4. The surgical or medical dressing of claim 3, wherein the water vapor transmission rate is at least 1200 liters vapor/m²/24 hours at 40°

C. and 80% relative humidity difference.

5. The surgical or medical dressing of claim 1, wherein the adhesive composition contains from about 20 to 35% by weight of hydroxyalkyl acrylate or methacrylate.

6. The surgical or medical dressing of claim 5, wherein the alkyl group in said hydroxyalkyl acrylate or methacrylate has 2 carbon atoms.

7. The surgical or medical dressing of claim 6, wherein the alkyl group of the alkyl acrylate or methacrylate of group a) contains 4 to 8 carbon atoms.

8. The surgical or medical dressing of claim 7, wherein the water vapor transmission rate is at least 1200 liters vapor/m²/24 hours at 40°

C. and 80% relative humidity difference.