	US 12,220,836 B2
	Modified wood product and a process for producing said product
Duncan Mayes, Helsinki (FI); Janne Pynnönen, Espoo (FI); and Reeta-Maria Stöd, Ylämylly (FI)
Assigned to Stora Enso OYJ, Helsinki (FI)
Appl. No. 15/764,050
Filed by Stora Enso OYJ, Helsinki (FI)
PCT Filed Sep. 28, 2016, PCT No. PCT/IB2016/055796 § 371(c)(1), (2) Date Mar. 28, 2018, PCT Pub. No. WO2017/056013, PCT Pub. Date Apr. 6, 2017.
Claims priority of application No. 1551246-0 (SE), filed on Sep. 29, 2015.
Prior Publication US 2019/0054650 A1, Feb. 21, 2019
Int. Cl. B27K 5/00 (2006.01); B27K 3/15 (2006.01); C08G 8/10 (2006.01); C09D 15/00 (2006.01); C09D 161/06 (2006.01); C08G 14/08 (2006.01); C08L 61/06 (2006.01); C08L 61/28 (2006.01); C08L 61/34 (2006.01); C08L 97/00 (2006.01); C08L 97/02 (2006.01)

CPC B27K 5/0085 (2013.01) [B27K 3/15 (2013.01); C08G 8/10 (2013.01); C09D 15/00 (2013.01); C09D 161/06 (2013.01); B27K 2240/20 (2013.01); C08G 14/08 (2013.01); C08L 61/06 (2013.01); C08L 61/28 (2013.01); C08L 61/34 (2013.01); C08L 97/005 (2013.01); C08L 97/02 (2013.01)]

18 Claims

1. A process for preparing modified wood comprising the steps of

a. resin treatment of never dried solid wood having a moisture content of at least 10%, wherein the resin solution comprises at least one of the group consisting of phenol formaldehyde, phenol urea formaldehyde, a melamine resin, lignin, tannin or a mixture thereof, wherein a quantity of the resin applied is 10-400 g/m^2,followed by

b. a thermal modification step wherein the wood is heated at a temperature of from 160° C. to 230° C. at atmospheric pressure for a time of 1 to 5 hours in an essentially oxygen-free environment wherein curing and crosslinking of the resin takes place.