Pressure sensitive adhesive

• US 5,587,237 A
• Filed: 02/14/1995
• Issued: 12/24/1996
• Est. Priority Date: 11/17/1992
• Status: Expired due to Fees

• Current Assignee: RALF Korpman Associates Incorporated
• Original Assignee: RALF Korpman Associates Incorporated
• Inventors: Korpman, Ralf, Korpman, Dennis, Korpman, Vera, Korpman, Michael
• Primary Examiner(s): DAVIS, JENNA L
• Application Number:
  US08/389,061
• Time in Patent Office: 679 Days
• Field of Search: 428/355, 428/343
• US Class Current: 428/355.00R
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 2666/08 Homopolymers or copolymers according to C08L7/00 - C08L21/00; Derivatives thereof
• CPC Class Codes: C09J 109/00 Adhesives based on homopolymers or copolymers of conjugated diene hydrocarbons
• CPC Class Codes: C09J 115/00 Adhesives based on rubber derivatives C09J111/00, C09J113/00 take precedence
• CPC Class Codes: C09J 121/00 Adhesives based on unspecified rubbers
• CPC Class Codes: C09J 153/00 Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
• CPC Class Codes: C09J 153/02 Vinyl aromatic monomers and conjugated dienes
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer
• CPC Class Codes: Y10T 428/2852 Adhesive compositions

Abstract

This invention relates to a novel pressure sensitive adhesive formed of a liquid and solid rubber which is substantially resin free. Preferably the adhesive is formed of a weight ratio of solid rubber to liquid rubber of about 1:0.5 to about 1:7. These adhesives exhibit improved adhesion in cold weather and oily surface applications and other properties. The pressure sensitive adhesives can be used in health care, industrial and drug delivery systems.

Claims

1. A health care pressure-sensitive adhesive product having improved skin tack and skin adhesion characteristics comprising a flexible backing having coated on at least one side thereof said pressure-sensitive composition, said pressure sensitive composition comprising a solid rubber and a liquid rubber wherein the weight ratio of said solid rubber to said liquid rubber being from about 1:

0.5 to about 1;

7 ,said liquid rubber being selected from the group consisting of liquid isoprene-styrene, liquid butadiene-styrene, liquid carboxyl terminated isoprene, liquid hydroxyl terminated isoprene and liquid hydrogenated isoprene, wherein said composition is substantially tackifying resin free.

2. An industrial pressure-sensitive adhesive product having improved tack and adhesion characteristics comprising a flexible backing having coated on at least one side thereof said pressure-sensitive composition, said pressure sensitive composition comprising a solid rubber and a liquid rubber wherein the weight ratio of said solid rubber to said liquid rubber being from about 1:

0.5 to about 1;

7, said liquid rubber being selected from the group consisting of liquid isoprene styrene, liquid butadiene-styrene, liquid carboxyl terminated isoprene, liquid hydroxyl terminated isoprene and liquid hydrogenated isoprene, wherein said composition is substantially tackifying resin free.

3. A drug delivery system pressure-sensitive adhesive product having improved skin tack and skin adhesion characteristics comprising said flexible backing having coated on at least one side thereof a pressure-sensitive composition in which said drug is incorporated in said system, said pressure sensitive composition comprising a solid rubber and a liquid rubber wherein the weight ratio of said solid rubber to said liquid rubber being from about 1:

0.5 to about 1;

7, said liquid rubber being selected from the group consisting of liquid isoprene-styrene, liquid butadiene-styrene, liquid carboxyl terminated isoprene, liquid hydroxyl terminated isoprene and liquid hydrogenated isoprene, wherein said composition is substantially tackifying resin free.