US 12,111,485 B2
Textured coating for optical products
Thomas J. Ludemann, Maplewood, MN (US); Jeffrey W. Hagen, Woodbury, MN (US); David T. Ask, Somerset, WI (US); Kristy A Gillette, Spring Valley, WI (US); and Eric D. Shockey, Stillwater, MN (US)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Filed on May 27, 2021, as Appl. No. 17/332,477.
Application 17/332,477 is a division of application No. 15/306,756, abandoned, previously published as PCT/US2015/026875, filed on Apr. 21, 2015.
Claims priority of provisional application 61/984,451, filed on Apr. 25, 2014.
Prior Publication US 2021/0302628 A1, Sep. 30, 2021
Int. Cl. G02B 5/02 (2006.01); B05D 1/28 (2006.01); B05D 1/30 (2006.01); G02B 1/10 (2015.01); G02B 27/00 (2006.01)
CPC G02B 5/0268 (2013.01) [B05D 1/28 (2013.01); B05D 1/305 (2013.01); G02B 1/10 (2013.01); G02B 5/021 (2013.01); G02B 5/0221 (2013.01); G02B 5/0278 (2013.01); G02B 27/0025 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An optical element comprising:
a light transmissive substrate; and
a continuous coating on the substrate, wherein the coating comprises:
a first region comprising a first polymer selected from cellulose resins and (meth)acrylic resins; and
a second region comprising a second polymer different from the first polymer, wherein the second polymer is selected from cellulose resins and (meth)acrylic resins;
wherein the first polymer and the second polymer are incompatible and non-reactive with one another, wherein the absolute value of the difference between the refractive index of the first polymer and the refractive index of the second polymer is from about 0 to about 0.01, wherein the first regions have a thickness different from the second regions, wherein the ratio by weight of the first polymer to the second polymer is from 1:2 to 10:1, and wherein the second regions project away from a surface of the substrate to a height of about 0.1 μm to about 15 μm above the height of the first regions.