Microlattice structures including flame retardant materials and compositions and methods for forming the same

Patent metadata

Field	Value
Publication number	US-11155681-B2
Application number	US-201916518725-A
Country	US
Kind code	B2
Filing date	Jul 22, 2019
Priority date	Aug 14, 2014
Publication date	Oct 26, 2021
Grant date	Oct 26, 2021

Abstract

A composition for forming a microlattice structure includes a photopolymerizable compound and a flame retardant material. A microlattice structure includes a plurality of struts interconnected at a plurality of nodes, the struts including: a copolymer including a reaction product of a photopolymerizable compound and a flame retardant material. A microlattice structure includes a plurality of struts interconnected at a plurality of nodes, the struts including: a polymer including a reaction product of a photopolymerizable compound; and a flame retardant material.

First claim

What is claimed is:

1. An ordered microlattice structure comprising:
a plurality of struts interconnected at a plurality of nodes, the struts comprising:
a copolymer comprising a reaction product of a photopolymerizable compound and a flame retardant material,

wherein the flame retardant material is selected from a phosphate, a phosphonate, a phosphinate, and a mixture thereof.

2. The microlattice structure of claim 1 , wherein the photopolymerizable compound comprises a first compound comprising an unsaturated carbon-carbon bond and a second compound comprising a terminal thiol group.

3. The microlattice structure of claim 2 , wherein the first compound comprising the unsaturated carbon-carbon bond is selected from the group consisting of ethylene, substituted olefins, 1,3-dienes, styrene, α-methyl styrene, vinyl esters, acrylates, methacrylates, acrylonitriles, acrylamides, N-vinyl carbazoles, N-vinyl pyrrolidone, and mixtures thereof.

4. The microlattice structure of claim 2 , wherein the second compound comprising the terminal thiol group is selected from the group consisting of pentaerythritol-tetra-3-mercaptopropionate, trimethylolpropane tris(3-mercaptopropionate), 1,6-hexanedithiol, trimethylolpropane tris(2-mercaptoacetate), ethoxylated trimethylolpropane tris(3-mercaptopropionate), glycol di-3-mercaptopropionate, and mixtures thereof.

5. The microlattice structure of claim 1 , wherein a photopolymerizable functional group is bonded to the flame retardant material, and the photopolymerizable functional group of the flame retardant material is selected from a thiol group, an alkenyl group, an alkynyl group, an acrylate group, an epoxy group, and a methacrylate group.

6. An ordered microlattice structure comprising:
a plurality of struts interconnected at a plurality of nodes, the struts comprising:
a polymer comprising a reaction product of a photopolymerizable compound; and
a flame retardant material,

wherein the flame retardant material is attached to the polymer by a chemical bond, and
wherein the chemical bond is formed by a reaction of a first non-photopolymerizable functional group of the photopolymerizable compound and a second non-photopolymerizable functional group bonded to the flame retardant material.

7. The microlattice structure of claim 6 , wherein the polymer at least partially surrounds the flame retardant material.

8. The microlattice structure of claim 7 , wherein the flame retardant material comprises particles comprising a material selected from alumina trihydrate, ammonium polyphosphate, red phosphorous, an organic phosphinate, melamine polyphosphate, borates, expandable graphite, a phosphorous based oligomer, and a mixture thereof.

9. The microlattice structure of claim 6 , wherein the struts comprise a coating comprising the flame retardant material on the polymer.

10. The microlattice structure of claim 6 , wherein the first non-photopolymerizable functional group is selected from an isocyanate group, a hydroxyl group, an amine group, a carboxylic acid group, an epoxy group, a silyl ether, and a combination thereof, and
wherein the second non-photopolymerizable functional group is selected from an isocyanate group, a hydroxyl group, an amine group, a carboxylic acid group, an epoxy group, and a combination thereof.

11. A method of forming a microlattice structure, the method comprising:
exposing a composition comprising a photopolymerizable compound and a flame retardant material to collimated light to form a precursor-microlattice structure; and
curing the precursor-microlattice structure to form the microlattice structure,
wherein the curing of the precursor-microlattice structure forms a chemical bond between the flame retardant material and a polymer comprising a reaction product of the photopolymerizable compound, and
wherein the chemical bond is formed by a reaction of a first non-photopolymerizable functional group of the photopolymerizable compound and a second non-photopolymerizable functional group bonded to the flame retardant material.

12. The method of claim 11 , wherein a photopolymerizable functional group is bonded to the flame retardant material and the exposing of the composition copolymerizes the flame retardant material with the photopolymerizable compound.

13. The method of claim 11 , wherein the flame retardant material is included in the composition in an amount of 1 to 33 wt % based on the total weight of the composition.

14. The method of claim 11 , wherein the exposing of the composition polymerizes the photopolymerizable compound to form the polymer.

Assignees

• Hrl Lab Llc

Inventors

• Yang Sophia S
• Clough Eric C
• Boundy Thomas I
• Nowak Andrew P
• Eckel Zak C
• Jacobsen Alan J

Classifications

• C08K5/10 Primary

  Esters; Ether-esters · CPC title

• C09K21/00

  Fireproofing materials (for use in a particular application, see the relevant places, e.g. fireproofing of wood B27K, of polymers C08, of textiles D06M, of paper D21H; fireproof paints C09D5/18) · CPC title

• C09D181/00

  Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur, with or without nitrogen, oxygen, or carbon only; Coating compositions based on polysulfones; Coating compositions based on derivatives of such polymers · CPC title

• C08G75/00 Primary

  Macromolecular compounds obtained by reactions forming a linkage containing sulfur with or without nitrogen, oxygen, or carbon in the main chain of the macromolecule · CPC title