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US 10,518,512 B2Granted
Method of forming dual-cure nanostructure transfer film
Assignee3M Innovative Properties Company
InventorsEvan L. Schwartz, Shijing Cheng, Claire Hartmann-Thompson
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Abstract
A method of forming a transfer film is described. The transfer film includes a template layer having a first major surface and an opposing second major surface. The second major surface includes a structured non-planar release surface. A backfill layer is disposed upon and conforms to the non-planar structured surface. The backfill layer includes a first cross-linked polymer and a plurality of multifunctional monomers, which cure via different and independent curing mechanisms.
Claims15
A method of forming a transfer film comprising:
- coating a backfill composition onto a structured non-planar template layer to form a backfill layer conforming to the structured non-planar template layer, the backfill composition comprising:
- multifunctional epoxy monomers;
- and
- from 40 wt-% to 90 wt-% multifunctional acrylate monomers, each multifunctional acrylate monomer having multiple acrylate functionalities;
- and
- selectively curing the multifunctional epoxy monomers without curing the multifunctional acrylate monomers to form a transfer film from the backfill layer, the transfer film comprising a cross-linked epoxy polymer with the multifunctional acrylate monomers dispersed therein, wherein the transfer film adheres to the structured non-planar template layer, and wherein the transfer film has a glass transition temperature value that is less than 30 degrees centigrade.
3 more elements
Dependencies are inferred from the claim text.