Compositions: coating or plastic – Coating or plastic compositions – Contains fireproofing or biocidal agent
Reexamination Certificate
2000-05-24
2002-01-22
Green, Anthony (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Contains fireproofing or biocidal agent
C424S630000, C424S635000, C424S638000, C424S719000, C514S642000, C514S644000, C514S500000
Reexamination Certificate
active
06340384
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to wood preservative and waterproofing compositions containing an amine oxide and an aqueous copper amine complex.
BACKGROUND OF THE INVENTION
Chromated copper arsenate is commonly employed as a wood preservative. The chromium oxidizes the wood and generates sites for fixing the copper and arsenic to the wood. Although copper is a highly effective wood preservative, some fungi are resistant to its biocidal activity. The arsenic serves to control fungi that are tolerant to copper and protect the wood against wood destroying insects.
In recent years, however, many concerns have been raised regarding contamination of the environment by chromium and arsenic. There is also increasing concern regarding disposal of wood treated with chromated copper arsenate and halides.
As a result, there is a need for copper containing wood preservatives which do not contain chromium, arsenic, or halides and are environmentally friendly, yet have similar wood preservative properties to chromated copper arsenate.
SUMMARY OF THE INVENTION
Applicants have discovered that amine oxides enhance the performance of aqueous copper amine complexes as wood preservatives and provide waterproofing properties. The present invention provides a composition comprising an amine oxide and an aqueous copper amine complex.
Another embodiment of the present invention is a method for preserving and/or waterproofing a wood substrate by contacting the composition with the wood substrate.
Yet another embodiment is an article comprising a wood substrate and the composition of the present invention.
This composition has high efficacy against fungi, including copper tolerant fungi such as brown rot and soft rot. Also, the composition is phase stable at high concentrations without the need for polyamines or other stabilizers known in the prior art. The amine oxide in the composition may impart waterproofing properties. The composition of the present invention is typically free of ionic halides, in particular chlorides, and is environmentally friendly.
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides a composition comprising an amine oxide and an aqueous copper amine complex.
The amine oxide may be a trialkylamine oxide; N-alkylated cyclic amine oxide; a dialkylpiperazine di-N-oxide; an alkyldi(poly(oxyalkylene))amine oxide; a dialkylbenzylamine oxide; a fatty acylaminopropyldimethylamine oxide; a diamine dioxide; a triamine trioxide; and any combination of any of the foregoing.
Preferred trialkylamine oxides have the formula R
1
R
2
R
3
N→O, where R
1
is a linear, branched, cyclic or any combination thereof C
6
to C
40
saturated or unsaturated group; and R
2
and R
3
independently are linear, branched, or any combination thereof C
1
to C
40
saturated or unsaturated groups. R
1
, R
2
, and R
3
independently may be alkyl, alkenyl, or alkynyl groups. R
1
is preferably a C
8
to C
40
group. More preferably, R
1
is a linear, branched, cyclic or any combination thereof C
8
to C
22
saturated or unsaturated group, such as coco, hydrogenated tallow, soya, decyl, and hexadecyl; and R
2
and R
3
independently arc linear, branched, or any combination thereof C
1
to C
22
saturated or unsaturated groups, such as coco, hydrogenated tallow (which is typically about 70-75% by weight of C
1
. alkyl, about 20-25% by weight of C
16
alkyl, and traces of lower derivatives), soya, decyl, and hexadecyl.
A preferred trialkylamine oxide is a dialkylmethylamine oxide having the formula R
1
R
2
CH
3
N→O, where R
1
and R
2
are defined as above. Another preferred trialkylamine oxide is an alkyldimethylamine oxide having the formula R
1
(CH
3
)
2
N→O, where R
1
is defined as above. Suitable alkyldimethylamine oxides include, but are not limited to, a C
10
alkyldimethylamine oxide, a C
12
-C
14
alkyldimethylamine oxide, a C
16
-C
18
alkyldimethylamine oxide, and any combination of any of the foregoing.
Preferred N-alkylated cyclic amine oxides have the formula R
4
R
5
R
6
N→O where R
4
is defined as R
1
above and R
5
and R
6
are linked to form a cyclic group. The cyclic group typically contains from about 4 to about 10 carbon atoms and may optionally contain oxygen, sulfur, nitrogen, or any combination of any of the foregoing. More preferred N-alkylated cyclic amine oxides include, but are not limited to, an alkylmorpholine N-oxide, a dialkylpiperazine di-N-oxide, and any combination of any of the foregoing.
Preferred alkylmorpholine N-oxides have the formula
where
R
7
is defined as R
1
above.
Preferred dialkylpiperazine di-N-oxides have the formula
where
R
8
is defined as R
1
above and R
9
is defined as R
2
above.
Preferred alkyldi(poly(oxyalkylene))amine oxides have the formula
where
R
10
is defined as R
1
above; R
11
and R
12
independently are H or CH
3
; and m and n independently are integers from about 1 to about 10.
Preferred dialkylbenzylamine oxides have the formula R
10
R
11
R
12
N→O, where R
10
is defined as R
1
above; R
11
is defined as R
2
above; and R
12
is benzyl. More preferred dialkylbenzylamine oxides include, but are not limited to, alkylbenzylmethylamine oxides having the formula R
10
R
12
CH
3
N→O where R
10
and R
12
are defined as above.
Preferred fatty acylaminodimethylpropylamine oxides have the formula
where
R
13
is defined as R
1
above.
Preferred diamine dioxides have the formula
where
R
14
is defined as R
1
above; and m is an integer from about 1 to about 10.
Preferred triamine trioxides have the formula
where
R
15
is defined as R
1
above; and m and n independently are integers from about 1 to about 10.
Long chain (C
16
or greater) amine oxides, such as hexadecylamine oxides, octadecyldimethylamine oxides, and hydrogenated tallow amine oxides, are particularly preferable for imparting waterproofing properties to the composition. Short chain (C
14
and shorter) amine oxides, such as decyldimethylamine oxides, dodecyldimethylaine oxides, and tetradecyldimethylamine oxides, aide in solubilizing the aqueous copper amine complex and long chain amine oxides, and are efficient stabilizers.
Preferably, the composition contains a mixture of C
16
-C
18
, long chain amine oxides to impart waterproofing properties and C
10
-C
14
short chain amino oxides to solubilize the long chain amine oxides. Typically, such a mixture comprises at least 50% by weight of long chain amine oxide based upon 100% total weight of amine oxides.
A blend of long chain and short chain amine oxides is also contemplated in one embodiment of the present invention. The long chain amine oxides may be blended with the short chain amine oxides in a ratio of about from about 1:10 to 10:1 in order to yield a stable preservative solution as described herein. For example, in a preferred embodiment, a mixture of long chain (e.g., C
16
) and short chain (e.g., C
12
) amine oxides in a ratio of from about 1:1 to about 5:1 and particularly a ratio of about 5:2 provides the desired dissolution of copper amine complex to provide a stable solution. The appropriate ratio of long to short chain amine oxides can be readily determined by those of skill in the art using methods provided herein to test solubility and stability of the solutions.
The copper amine complex generally contains a water soluble amine. Suitable copper amine complexes include, but are not limited to, ammonium/copper complexes, ethanolamine/copper complexes, diethanolamine/copper complexes, triethanolamine/copper complexes, diethylamine/copper complexes, ethylene diamine/copper complexes, or any combination of any of the foregoing.
The weight ratio of copper (expressed as copper oxide) to amine oxide in the composition generally ranges from about 1:0.01 to about 1:50 and preferably ranges from about 1:0.5 to about 1:2. According to one embodiment, the weight ratio ranges from about 1:0.1 to about 1:5. In embodiments of the composition which include at least two amine oxides, the weight ratio of copper (expressed as copper oxide) to total amine oxide preferably ranges f
Darby & Darby
Green Anthony
Lonza Inc.
LandOfFree
Copper/amine oxide wood preservatives does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Copper/amine oxide wood preservatives, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Copper/amine oxide wood preservatives will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2875069