Process for the staining of wood with aqueous wood stains

Details Process for the staining of wood with aqueous wood stains Process for the staining of wood with aqueous wood stains

2001-05-07

2003-10-07

Einsmann, Margaret (Department: 1751)

Bleaching and dyeing; fluid treatment and chemical modification

Wood dyeing process

C008S442000, C008S490000, C008S568000

Reexamination Certificate

active

06630002

ABSTRACT:

The present invention relates to aqueous wood stains and to their use in a process for the staining of wood.
Stained woods, or the dyes applied to the wood often exhibit undesired bleaching or changes in shade as a result of the action of light and/or heat. Furthermore, the stained woods often display a colour unlevelness.
The use of solvent-containing wood stains for the photochemical and thermal stabilization of the (unstained) material wood is known, for example, from EP-A-0 943 665.
EP-A-0 479 075 discloses the treatment of wood with a wood stain comprising a colorant, a solvent and a stabilizer.
There continues to be a need for an improved protection of the stained wood against light and evolution of heat, and for a process which permits even penetration of the wood and uses low-solvent or solvent-free wood stains.
The object of the present invention was therefore to provide a process according to which the stained wood would satisfy today'requirements with regard to penetration, photostability and heat stability.
It has now been found that using the special wood stains described below it is possible to achieve good penetration and very good stabilization of stained wood.
Accordingly, the present invention provides a process for the staining of wood, which comprises treating the unstained wood with an aqueous preparation (stain) comprising
a) at least one dye and
b) at least one dye stabilizer of the formulae (I) or (II)
 in which
G
1
and G
2
, independently of one another, are C
1
-C
4
alkyl or together are pentamethylene,
Z
1
and Z
2
are methyl, or Z
1
and Z
2
form a bridging member which is unsubstituted or substituted by an ester, ether, hydroxyl, oxo, cyanohydrin, amido, amino, carboxyl or urethane radical,
E is oxyl or hydroxyl, and
X is an inorganic or organic anion, and
the total number of cations h corresponds to the total number of anions j.
Preference is given to dye stabilizers of the formulae (I) and (II) in which Z
1
and Z
2
are methyl or a bridging member containing 1-200 carbon atoms and 0-60 oxygen and/or nitrogen atoms.
X is, for example, phosphate, carbonate, bicarbonate, nitrate, chloride, bromide, bisulfite, sulfite, bisulfate, sulfate, borate, carboxylate, alkylsulfonate, arylsulfonate or phosphonate, for example diethylenetriaminepentamethylenephosphonate.
X as carboxylate is, in particular, a formate, acetate, benzoate, citrate, oxalate, tartrate, acrylate, polyacrylate, fumarate, maleate, itaconate, glycolate, gluconate, malate, mandalate, tiglate, ascorbate, polymethacrylate, nitrilotriacetate, hydroxyethylethylenediaminetriacetate, ethylenediaminetetraacetate or diethylenetriaminepentaacetate.
X is preferably chloride, bisulfite, bisulfate, sulfate, phosphate, nitrate, ascorbate, acetate, citrate, ethylenediaminetetraacetate or diethylenetriaminepentaacetate;
X is particularly preferably bisulfate or citrate.
h and j are preferably 1-5.
As a bridging member, Z
1
and Z
2
preferably contain 2 or 3 carbon atoms or 1 or 2 carbon atoms and a nitrogen or oxygen atom which together with the radical of the formulae (I) or (II) form a 5-membered or 6-membered heterocyclic ring which may be further substituted. The substituents of Z
1
and Z
2
can also contain radicals of sterically hindered amines. Preference is given to compounds of the formulae (I) and (II) containing 1-4, in particular 1 or 2, sterically hindered amines or sterically hindered ammonium radicals. Aryl is to be understood as meaning, for example, C
6
-C
12
aryl, in particular phenyl or naphthyl, especially phenyl.
The dye stabilizers given under b) can be used individually or as mixtures with one another.
Alkyl is to be understood as meaning, for example, C
1
-C
18
alkyl, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl or octadecyl.
Alkylene is to be understood as meaning, for example, methylene, 1,2-ethylene, 1,1-ethylene, 1,3-propylene, 1,2-propylene, 1,1-propylene, 2,2-propylene, 1,4-butylene, 1,3-butylen, 1,2-butylene, 1,1-butylene, 2,2-butylene, 2,3-butylene, or —C
5
H
10
—, —C
6
H
12
—, —C
7
H
14
—, —C
8
H
16
—, —C
9
H
18
—, —C
10
H
20
—, —C
11
H
22
—, —C
12
H
24
—, —C
13
H
26
—, —C
14
H
28
—, —C
15
H
30
—, —C
16
H
32
—, —C
17
H
34
— and —C
18
H
36
—.
Cycloalkyl or cycloalkoxy are to be understood as meaning, for example, C
5
-C
12
-cycloalkyl or C
5
-C
12
-cycloalkoxy, such as cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl or cyclododecyl, cyclopentoxy, cycloheptoxy, cyclodecyloxy or cyclododecyloxy.
Cycloalkenyl is to be understood as meaning, for example, C
5
-C
12
cycloalkenyl, such as cyclopentenyl, cyclohexenyl, cycloheptenyl, cyclooctenyl or cyclononenyl.
Aralkyl and aralkoxy are preferably phenylalkyl or phenylalkoxyl, such as benzyl, benzyloxy, &agr;-methylbenzyl, &agr;-methylbenzyloxy, cumyl or cumyloxy.
Alkenyl radicals are, for example, C
2
-C
18
alkenyl, in particular allyl.
Alkynyl radicals are, for example, C
2
-C
12
alkynyl, in particular propargyl.
Acyl is, for example, a radical R(C═O)—, in which R is an aliphatic or aromatic radical.
Aliphatic or aromatic radical means, for example, an aliphatic or aromatic C
1
-C
30
hydrocarbon; for example aryl, alkyl, cycloalkyl, alkenyl, cycloalkenyl, bicycloalkyl, bicycloalkenyl, and a combination of these radicals.
Examples of acyl are C
2
-C
12
alkanoyl, C
3
-C
12
alkenoyl and benzoyl.
Examples of alkanoyl are formyl, propionyl, butyryl, pentanoyl, octanoyl and, in particular, acetyl.
Alkenoyl is preferably acryloyl or methacryloyl.
The alkyl substituents may be linear or branched.
Examples of C
1
-C
6
alkyl are methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, pentyl and hexyl.
Examples of C
2
-C
4
alkenyl are ethenyl, propenyl and butenyl.
Examples of C
1
-C
4
alkyl which is interrupted by one or two oxygen atoms are —CH
2
—O—CH
3
, —CH
2
—CH
2
—O—CH
3
, —CH
2
—CH
2
—O—CH
2
—CH
3
, —CH
2
—O—CH
2
CH
2
—O—CH
3
and —CH
2
—O—CH
2
—O—CH
3
.
Preference is given to the dye stabilizers given under b) chosen from the compounds A to EE and A* to EE* and III to IIIc
in which
E is oxyl or hydroxyl,
R is hydrogen or methyl,
in the formulae A and A*,
n is 1 or 2,
if n is 1,
R
1
is hydrogen, C
1
-C
18
alkyl, C
2
-C
18
alkenyl, propargyl, glycidyl, C
2
-C
50
alkyl which is unsubstituted or substituted by one to ten hydroxyl groups and which may be interrupted by one to twenty oxygen atoms, or
R
1
is C
1
-C
4
alkyl substituted by carboxyl or —COOZ, in which Z is hydrogen, C
1
-C
4
alkyl or phenyl or in which Z is C
1
-C
4
alkyl substituted by —(COO
−
)
n
M
n+
, in which n is a number 1-3 and M is a metal ion from the first, second or third group of the Periodic Table or is Zn, Cu, Ni or Co, or M is a group N
n+
(R
2
)
4
, in which R
2
is C
1
-C
8
alkyl or benzyl,
if n is 2,
R
1
is C
1
-C
12
alkylene, C
4
-C
12
alkenylene, xylylene or C
1
-C
50
alkylene which is unsubstituted or substituted by one to ten hydroxyl groups and which may be interrupted by one to twenty oxygen atoms,
in the formulae B and B*,
m is 1 to 4,
if m is 1,
R
2
is C
1
-C
18
alkyl, C
3
-C
18
alkyl interrupted by —COO—, C
3
-C
18
alkyl substituted by COOH or COO—, or R
2
is —CH
2
(OCH
2
CH
2
)
n
OCH
3
, in which n is a number from 1 to 12, or R
2
is C
5
-C
12
cycloalkyl, C
6
-C
12
aryl which is unsubstituted or is substituted by one to four C
1
-C
4
alkyl, or
R
2
is —NHR
3
, in which R
3
is C
1
-C
18
alkyl, C
5
-C
12
cycloalkyl, C
6
-C
12
aryl which is unsubstituted or is substituted by one to four C
1
-C
4
alkyl, or
R
2
is —N(R
3
)
2
, in which R
3
is C
1
-C
18
alkyl, C
5
-C
12
cycloalkyl, C
6
-C
12
aryl which is unsubstituted or is substituted by one to four C
1
-C
4
alkyl,
if m is 2,
R
2
is C
1
-C
12
alkylene, C
4
-C
12
alkenylene, xylylene, C
2
-C
12
alkylene interrupted by —COO—, C
3
-C
18
alkylene substituted by COOH or COO—, or R
2
is —CH
2
(OCH
2
CH
2
)
n
OCH
2
—, in which n is a numbe

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