Low-tack, UV-cured pressure sensitive adhesive suitable for reclosable packages

摘要

UV-cured pressure sensitive adhesive including one or more UV-curable acrylic oligomers, one or more tack control components, and, optionally, an elastomeric material is described herein. The adhesive includes an adhesive component ratio of the various adhesive components effective to provide desired first peel adhesions and subsequent peel adhesions.

主权项

1. A UV-curable pressure sensitive adhesive comprising:
a UV-curable acrylic oligomer having a positive glass transition temperature, a separate tack control component, and optionally at least one separate elastomeric material; an adhesive component ratio (ACR) of the pressure sensitive adhesive defined by formula (A) where the weight percent of the UV-curable acrylic oligomer relative to the sum of the weight percents of the tack control component and the elastomeric material is about 0.5 to about 1.5(UV⁢-⁢curable⁢⁢acrylic⁢⁢oligomer)(tack⁢⁢control⁢⁢component+elastomeric⁢⁢material);(A) the ACR effective so that a UV-cured pressure sensitive adhesive forms a first peel adhesion between opposing strips of the UV-curable pressure sensitive adhesive of about 200 to about 900 grams per linear inch (gpli) and up to five subsequent peel adhesions each about 30 to about 200 percent of the first peel adhesion and a first subsequent peel adhesion after fouling with debris at least about 50 percent of the first peel adhesion; a liquid mixture of the UV-curable acrylic oligomer, the tack control component, and the optional elastomeric material are compatible such that the liquid mixture remains a stable liquid that is homogeneous without phase separation for at least about 3 days at about 70 to about 75° F.; and wherein the tack control component is an aliphatic urethane acrylate oligomer.