Removable curl labels

摘要

This invention relates to labels, particularly removable polymeric labels for use on reusable containers. The labels contain at least two polymeric layers having different coefficients of linear thermal expansion, such that, upon exposure to elevated temperatures, the label is reversibly curled.

主权项

1. A pressure sensitive adhesive label comprising:
a first polymeric layer having a first coefficient of linear thermal expansion; a second polymeric layer that is not pre-stretched and having a second coefficient of linear thermal expansion underlying the first polymeric layer, wherein the first coefficient of linear thermal expansion is less than the second coefficient of linear thermal expansion; and a pressure sensitive adhesive layer underlying the second polymeric layer; wherein at least the second polymeric layer is configured to expand upon exposure to a temperature at or above 50° C. so as to reversibly curl the label in the direction of the first polymeric layer; wherein said adhesive exhibits a drop in peel adhesion at elevated temperature; and wherein the first polymeric layer and the second polymeric layer are coextruded from a coextrudate selected from the group consisting of a polyacrylate/polyethylene coextrudate and a polyacrylate/ethyl vinyl alcohol coextrudate.