Patent ID: 7833576
Filing Date: 2010-11-16
Classification: C09J,Y10T

Abstract:
1. A method of making a punched product which comprises the steps of: (a) applying an anisotropic pressure sensitive adhesive having linear polymer chains to one or both sides of a carrier material with an extrusion die to form a single coated or double coated carrier material such that the linear polymer chains are oriented on the carrier material and crosslinking the anisotropic pressure sensitive adhesive by irradiation with electron beams and freezing the orientation of the polymer chains on the carrier material, wherein said anisotropic pressure sensitive adhesive: (b) punching or partial-punching of said single or double coated material to form said punched product wherein the anisotropic pressure sensitive adhesive is slit during the punching or partial-punching and the anisotropic pressure sensitive adhesive at the slit does not coalesce after the punching or partial-punching.