公开(公告)号：US20210324243A1

公开(公告)日：2021-10-21

申请号：US17252599

申请日：2019-06-27

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Christopher W. Cox ,  Sarang V. Deodhar ,  Albert I. Everaerts ,  Becky A. Jetto ,  James J. Kobe ,  Meredith A. Opatz ,  Carla S. Thomas

IPC: C09J7/38 ,  C09J7/25 ,  C25D11/02 ,  C25D11/04

Abstract: A tape includes: a flexible backing layer having two major surfaces, wherein the backing layer has a thickness of greater than 25 micrometers; and an acrylic-based pressure sensitive adhesive layer disposed on one major surface of the backing layer, wherein the acrylic-based pressure sensitive adhesive comprises the reaction of one or more (C8-C20)alkyl acrylates with one or more reinforcing monomers having a homopolymer Tg of at least 50° C., wherein the acrylic-based pressure sensitive adhesive has a tan δ of at least 0.5 measured at 80° C. and an oscillating frequency of 1 radian/second, and wherein the acrylic-based pressure sensitive adhesive layer has a thickness of at least 5 micrometers; wherein, when disposed on an aluminum substrate, the tape displays clean removal from the aluminum substrate according to the Clean Removal Test described in the Examples Section, and a leakage distance of less than 762 micrometers according to the Chromic Acid Anodization-Leakage Distance Test described in the Examples Section. A method of anodizing an aluminum surface includes: providing a substrate having an aluminum surface; applying a tape as described herein to mask the aluminum surface and form a masked substrate; and exposing the masked substrate to an electrolyte solution including chromic acid under conditions effective to form aluminum oxide.