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US 2014/0235132 A1Published application
Phosphonate-substituted lignin as a flame retardant
AssigneeEmpire Technology Development LLC
InventorGlen Leon BRIZIUS
Life of this patent
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Abstract
Modified lignin having covalently attached phosphorous containing groups and methods for preparing such compounds are described herein. The modified lignin described herein provides a renewable source of flame retardant material.
Claims31
1-16. (canceled)
A method for producing a flame retardant, the method comprising:
- producing a reaction mixture by contacting a lignin having free hydroxyl groups with a solvent and a phosphorous containing compound of general formula:
- wherein:
- X1 and X2 are, phosphine, phosphine oxide, phosphinite, phosphonite, phosphinate, phosphonate, or phosphate;
- m1 is an integer of 1 to 10;
- and
- m2 is an integer of 1 to 10;
- and
- introducing a catalyst into the reaction mixture;
- wherein the lignin reacts with the phosphorous containing compound, and the phosphorous containing compound replaces one or more of the free hydroxyl groups on the lignin to covalently bond with the lignin and produce the flame retardant.
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An article of manufacture comprising:
- a flame retardant comprising:
- a lignin covalently bonded with a phosphorous containing component, the phosphorous containing component comprising a compound of general formula:
- wherein:
- X1 and X2 are, phosphine, phosphine oxide, phosphinite, phosphonite, phosphinate, phosphonate, or phosphate;
- m1 is an integer of 1 to 10;
- and
- m2 is an integer of 1 to 10.
4 more elements
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Dependencies are inferred from the claim text.