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Versatile Adhesive Compositions

IP.com Disclosure Number: IPCOM000238023D
Publication Date: 2014-Jul-25
Document File: 2 page(s) / 14K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present disclosure relates to adhesive compositions having different properties depending on the ratio of two base components. In some instances, the adhesive composition has very low tack. In other instances, the adhesive composition has high tack. This range of adhesive properties is achieved by varying the ratio of at least a first base component which remains tacky at different temperatures and becomes tack-free after a cross-linking reaction, and a second base component which provides tensile strength and optionally has reactive sites.

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Versatile Adhesive Compositions

Abstract

     The present disclosure relates to adhesive compositions having different properties depending on the ratio of two base components. In some instances, the adhesive composition has very low tack. In other instances, the adhesive composition has high tack. This range of adhesive properties is achieved by varying the ratio of at least a first base component which remains tacky at different temperatures and becomes tack-free after a cross-linking reaction, and a second base component which provides tensile strength and optionally has reactive sites.

Description

     Generally, different adhesive systems are used when different properties are desired. For example, when looking for a pressure sensitive adhesive (PSA), one of skill in the art would typically resort to acrylics or materials with similar properties thereof. For example, if low tack is a desired property the skilled artisan would formulate the PSA adhesive by, for example, increasing the level of cross-linking. Alternatively, the artisan would develop a new adhesive from a totally different chemical family. If permanent adhesion is the goal, the skilled person would typically look for reactive and cross- linking systems such as epoxies, polyurethanes, and acrylics. As a result, an adhesive developer empirically formulates and tests a plurality of compositions involving different classes of materials depending on the properties to be achieved.

     It is therefore an objective of the present disclosure to overcome the above-identified problems by providing a base adhesive composition whose properties (e.g., adhesion and tack) may be tailored to desired applications by virtue of simple modifications to the base composition. The present adhesive composition comprises two base components: a first base component which remains tacky at different temperatures and becomes tack-free after a cross-linking reaction, and a second base component which provides tensile strength and optionally has reactive sites.

     In some embodiments, the first base component is a water-based polyurethane latex, and the second component is at least one of a water-based urethane-acrylic and/or an acrylic latex with an UV curing option. When the water is dried from the adhesive system, the first component is tack-free but the second component remains tacky. Adjustable tack is achieved by combining the two components at different ratios. If minimal tack is desired, a higher ratio of the first component is used. If aggressive tack is desired, a higher ratio of the second component is used. If permanent adhesion is desired, a cross- linking initiator (e.g., a UV initiato...