Light collimating film
Assignee3M Innovative Properties Company
InventorsGary E. Gaides, Ignatius A. Kadoma, David B. Olson, Randy A. Larson, Anita R. Sykora
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Abstract
Light-collimating films as well as other microstructured film articles are described that comprise a (e.g. UV) cured light transmissive film comprising the reaction product of a polymerizable resin composition. Polymerizable resin compositions are also described that comprise aliphatic urethane (meth)acrylate oligomer(s), bisphenol-A ethoxylated diacrylate(s), and a crosslinker having at least three (meth)acrylate groups.
Claims20
A cured transparent film comprising the reaction product of a polymerizable resin comprising first and second polymerizable components selected from an aliphatic urethane diacrylate oligomer and a bisphenol-A ethoxylated diacrylate or bisphenol-A ethoxylated diacrylates, and a crosslinker having at least three (meth)acrylate groups;
- wherein a homopolymer of the second polymerizable component has an elastic tensile modulus as measured according to ASTM D5026-01 of less than 1×108 Pa at 25° C. and a homopolymer of the first polymerizable component has a modulus at least 5×107 Pa at 25° C. greater than the homopolymer of the second polymerizable component.
A cured transparent film comprising the reaction product of a polymerizable resin having a viscosity of less than 50,000 cps at 25° C. and the cured transparent film comprises microstructures having an included wall angle of less than 6 degrees.
A cured transparent film disposed on a polyester film wherein the cured transparent film comprises microstructures having an included wall angle of less than 6 degrees and the cured transparent film has a stiffness of at least 65 N/mm or a thickness of less than 535 microns and a stiffness of at least 50 N/mm.
Dependencies are inferred from the claim text.