Adhesives
AssigneeSmith & Nephew, Inc.
InventorIain Webster
Life of this patent
Estimating the term…
Abstract
An adhesive composition which is switchable under irradiation to change from a tacky to a less tacky state which includes a switchable polymer. The polymer comprises a backbone polymeric moiety bound to a plurality of curable moieties, each of which comprises a free-radically active group and has an amine functionality. Also, the switchable polymer, processes for producing such polymers and compositions, and switchable adhesive articles comprising the adhesive compositions, such as light-switchable pressure sensitive adhesive dressings, and methods of using such articles.
Claims9
A switchable adhesive composition capable of being influenced by radiation to change from a tacky to a less tacky state which includes a switchable polymer capable of being influenced by radiation to change from one state to another, said switchable polymer comprising a backbone polymeric moiety having a plurality of curable moieties bonded thereto, wherein at least a proportion of the curable moieties each comprises a free-radically active group, said polymer being manufactured by reacting:
- a) an acrylic backbone polymer containing unreacted carboxylic acid groups and optionally a cyclic anhydride group, a cyclic amide group, or a hydroxyester, with
- b) a curable compound that possesses a free-radically active vinylic group and has a primary amine functionality.
Dependencies are inferred from the claim text.