US 12,247,107 B2
Flame retardant polymers and methods of making
Robert N Brookins, Simpsonville, SC (US); Benjamin R. Butterfield, Boston, MA (US); and Nicholas H. Leitner, Greer, SC (US)
Assigned to ALEXIUM, INC., Greer, SC (US)
Appl. No. 17/046,978
Filed by Alexium, Inc., Greer, SC (US)
PCT Filed Apr. 12, 2019, PCT No. PCT/US2019/027349
§ 371(c)(1), (2) Date Oct. 12, 2020,
PCT Pub. No. WO2019/200333, PCT Pub. Date Oct. 17, 2019.
Claims priority of provisional application 62/656,944, filed on Apr. 12, 2018.
Prior Publication US 2021/0147636 A1, May 20, 2021
Int. Cl. C08G 79/04 (2006.01); C09D 185/02 (2006.01)
CPC C08G 79/04 (2013.01) [C09D 185/02 (2013.01)] 29 Claims
 
1. A polymer comprising a plurality of repeat units of Formula IIx, Formula IIy, or Formula IIz

OG Complex Work Unit Chemistry
wherein each X in each repeat unit independently is oxygen or is absent; each R1, R2, R3, and R4 in each repeat unit independently is a residue of a linking monomer that is capable of forming two or more covalent bonds with a phosphorus-containing monomer via condensation reactions with formaldehyde; and each R5 in each repeat unit independently is hydroxymethyl, aryl, or linear or branched C1-C10alkyl;
wherein the polymer comprises a plurality of repeat units of Formula IIy or Formula IIz;
wherein the polymer has a number average molecular weight less than 1,000,000;
wherein at least 20% of the phosphorus atoms in the polymer are present as phosphine oxide; and
wherein the polymer is water soluble.