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1. (WO2017070045) THERMALLY POST-CURABLE PRESSURE-SENSITIVE ADHESIVE

Pub. No.:    WO/2017/070045    International Application No.:    PCT/US2016/057318
Publication Date: Fri Apr 28 01:59:59 CEST 2017 International Filing Date: Tue Oct 18 01:59:59 CEST 2016
IPC: C09J 5/06
C09J 5/08
Applicants: 3M INNOVATIVE PROPERTIES COMPANY
Inventors: UNVERHAU, Kerstin
RICHTER, Mareike
MECHERNICH, Silke D.
KLINK, Anne-Marie
Title: THERMALLY POST-CURABLE PRESSURE-SENSITIVE ADHESIVE
Abstract:
The present disclosure relates to a method of applying a pressure-sensitive adhesive to a substrate, which comprises the steps of: a) providing an uncrosslinked curable precursor of a pressure-sensitive adhesive comprising: (1) a (meth)acrylate copolymer component comprising : i. C1-C32 (meth)acrylic acid ester monomer units; ii. ethylenically unsaturated monomer units having functional groups selected from the group consisting of acid, hydroxyl, acid anhydride, epoxide, amine, amide groups, and any combinations thereof; and iii. optionally, further ethylenically unsaturated monomer units which are copolymerizable with monomer units (i) and/or (ii); (2) a thermal crosslinking system; (3) at least one expandable microsphere; (4) optionally, a tackifying system; and (5) optionally, at least one pigment; b) subjecting the curable precursor of a pressure-sensitive adhesive to a first heating step such that the curable precursor of a pressure-sensitive adhesive is partially crosslinked; c) contacting the curable precursor of a pressure-sensitive adhesive obtained in step b) to at least part of the surface of the substrate; d) subjecting the curable precursor of a pressure-sensitive adhesive to a second heating step such that the curable precursor of a pressure-sensitive adhesive is fully crosslinked; and e) optionally, allowing the polymeric foam layer to cool down on the substrate.