Treated porous material

Patent metadata

Field	Value
Publication number	US-11951648-B2
Application number	US-202117326389-A
Country	US
Kind code	B2
Filing date	May 21, 2021
Priority date	Oct 27, 2015
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

The present disclosure describes a treated cellulosic material comprising a cellulosic material having a porous structure defining a plurality of pores, at least a portion of the pores containing a treating agent comprising a polymer, the polymer comprising a polyurethane polymer. The present disclosure further describes a method for preparing a treated cellulosic material comprising providing a cellulosic material; and a first treatment protocol comprising impregnating the cellulosic material with an aqueous dispersion comprising a polymer, the polymer comprising a polyurethane polymer; and a second treatment protocol comprising impregnating the cellulosic material with a modifying agent, the modifying agent comprising a hydrophobic amine.

First claim

What is claimed is:

1. A treated cellulosic material comprising:
a cellulosic material having a porous structure defining a plurality of pores, at least a portion of the pores containing a treating agent comprising a polymer, the polymer comprising a polyurethane polymer wherein the cellulosic material further comprises a hydrophobic amine modifying agent.

2. The treated cellulosic material of claim 1 , wherein the polyurethane polymer comprises a water-dispersible polyurethane.

3. The treated cellulosic material of claim 2 , wherein the water-dispersible polyurethane comprises the acidic or anionic form of dimethylolpropionic acid.

4. The treated cellulosic material of claim 2 , wherein the water-dispersible polyurethane comprises a thermoplastic polyurethane or a thermosetting polyurethane.

5. The treated cellulosic material of claim 1 , wherein at least a portion of the polymer is crosslinked.

6. The treated cellulosic material of claim 1 , wherein the hydrophobic amine is selected from the group consisting of N-methyl N-hexyl amine, N,N-diethyl n-hexylamine, n-octyl amine, n-decyl amine n-dodecyl amine, N-methyl cyclohexylamine, N,N,-diethyl cyclohexylamine, dicyclohexylamine, benzyl amine, coco amine, oleyl amine, stearyl amine, a N, N-dimethyl substituted fatty amine, phenethylamine, tallow amine, or a mixture thereof.

7. The treated cellulosic material of claim 1 , wherein the treated cellulosic material is prepared by a first treatment protocol comprising impregnating the cellulosic material with an aqueous dispersion comprising the treating agent and a second treatment protocol comprising impregnating the cellulosic material with a modifying agent comprising a hydrophobic amine.

8. The treated cellulosic material of claim 1 , wherein the treated cellulosic material has a WRE, as measured by American Wood Protection Association Standard E4-11, of at least 75 percent.

Assignees

• Dow Global Technologies Llc

Inventors

• King Stephen W
• Chen Xue

Classifications

• B27K3/153 Primary

  Without in-situ polymerisation, condensation, or cross-linking reactions · CPC title

• B27K3/0278

  involving an additional treatment during or after impregnation · CPC title

• C08L97/02 Primary

  Lignocellulosic material, e.g. wood, straw or bagasse {(manufacture of articles made from lignocellulosic material by dry processes B27N)} · CPC title

• C09D175/04

  Polyurethanes · CPC title

• B27K2240/70

  Hydrophobation treatment · CPC title