Chemical apparatus and process disinfecting – deodorizing – preser – Process disinfecting – preserving – deodorizing – or sterilizing – Deodorizing
Reexamination Certificate
2002-06-11
2003-12-02
Thornton, Krisanne (Department: 1744)
Chemical apparatus and process disinfecting, deodorizing, preser
Process disinfecting, preserving, deodorizing, or sterilizing
Deodorizing
C422S004000, C422S120000, C422S122000
Reexamination Certificate
active
06656425
ABSTRACT:
The invention relates to domestic appliances comprising a catalytic composition for the purpose of deodorizing and oxidizing organic components or carbon.
An object of the present invention is to provide catalytic compositions for domestic appliances which are capable of reducing or eliminating environmental odour pollution (deodorizing) and which are able to oxidize organic components or carbon.
This objective is surprisingly achieved by means of domestic appliances having a catalytic composition which comprises a coating of a coating material on a support and is obtainable by applying the coating material, comprising (1) a polycondensate of
(A) one or more silanes of the general formula (I)
R
a
—Si—X
(4-a)
(I)
in which the radicals R are identical or different and are non-hydrolysable groups, the radicals X are identical or different and are hydrolysable groups or hydroxyl groups and a has the value 0, 1, 2 or 3, with a being greater than 0 for at least 50 mol % of the silanes, or an oligomer derived therefrom,
(B) if desired, one or more compounds of glass-forming elements, and (2) particles of one or more transition metal oxides, the weight ratio of transition metal oxide particles to polycondensate being from 10:1 to 1:10, to the support and subjecting the applied coating material to thermal treatment, said catalytic composition representing a component of said domestic appliance or of a device connected with said domestic appliance.
In the hydrolysable silanes (A), the hydrolysable groups X are, for example, hydrogen or halogen (F, Cl, Br or I), alkoxy (preferably C
1-6
alkoxy, such as methoxy, ethoxy, n-propoxy, i-propoxy and butoxy), aryloxy (preferably C
6-10
aryloxy, such as phenoxy), acyloxy (preferably C
1-6
acyloxy, such as acetoxy or propionyloxy), alkylcarbonyl (preferably C
2-7
alkylcarbonyl, such as acetyl), amino, monoalkylamino or dialkylamino having preferably from 1 to 12, in particular from 1 to 6, carbon atoms.
The non-hydrolysable radicals R may be non-hydrolysable radicals R
1
or may be radicals R
2
which carry a functional group, R
1
being preferred.
The non-hydrolysable radical R
1
is, for example, alkyl (preferably C
1-8
alkyl, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, s-butyl and t-butyl, pentyl, hexyl, octyl or cyclohexyl), alkenyl (preferably C
2-6
alkenyl, such as vinyl, 1-propenyl, 2-propenyl and butenyl), alkynyl (preferably C
2-6
alkynyl, such as acetylenyl and propargyl) and aryl (preferably C
6-10
aryl, such as phenyl and naphthyl). The stated radicals R
1
and X may if desired have one or more customary substituents, such as halogen or alkoxy, for example.
Specific examples of the functional groups of the radical R
2
are the epoxy, hydroxyl, ether, amino, monoalkylamino, dialkylamino, amide, carboxyl, vinyl, acryloyloxy, methacryloyloxy, cyano, halogen, aldehyde, alkylcarbonyl, and phosphoric acid group. These functional groups are attached to the silicon atom via alkylene, alkenylene or arylene bridging groups, which may be interrupted by oxygen or —NH— groups. The stated bridging groups are derived, for example, from the abovementioned alkyl, alkenyl or aryl radicals. The radicals R
2
contain preferably from 1 to 18, in particular from 1 to 8, carbon atoms.
In one preferred embodiment, the silanes (A) comprise a mixture of
(A1) at least one hydrolysable silane of the general formula (II)
SiX
4
(II)
in which the radicals X are identical or different and are hydrolysable groups or hydroxyl groups, or an oligomer derived therefrom, and
(A2) at least one organosilane of the general formula (III),
R
1
a1
R
2
a2
SiX
(4-a1-a2)
(III)
in which R
1
is identical or different at each occurrence and is a non-hydrolysable group, R
2
is identical or different at each occurrence and is a radical which carries a functional group, X has the above definition and a1 and a2 have the value 0, 1, 2 or 3, the sum (a1+a2) having the value 1, 2 or 3, or an oligomer derived therefrom in a molar ratio (A1):(A2) of 5-50:50-95.
In the general formula (III), a1 preferably has the value 1 or 2, a2 preferably has the value 0, 1 or 2 and the sum (a1+a2) preferably has the value 1 or 2.
Particularly preferred hydrolysable silanes (A) and (A1) are tetraalkoxysilanes such as tetraethoxysilane (TEOS). Particularly preferred hydrolysable silanes (A) and (A2) are alkyltrialkoxysilanes, preferably containing C
1
-C
8
alkyl, especially methyltriethoxysilane, aryltrialkoxysilanes, especially phenyltriethoxysilane, dialkyldialkoxysilanes, preferably containing C
1
-C
8
alkyl, especially dimethyldiethoxysilane, and diaryldialkoxysilanes, especially diphenyldiethoxysilane. Silanes containing functional groups (A) and (A2) are, for example, epoxy silanes such as 3-glycidyloxypropyltrimethoxysilane (GPTS) and amino silanes such as 3-aminopropyltriethoxysilane and 3-(aminoethylamino)propyltriethoxysilane (DIAMO).
In the silane component (A) according to formula (I), a is greater than 0 for at least 50 mol % of the silanes, i.e. at least 50 mol % of the silanes contain at least one non-hydrolysable group R. The silane component (A) preferably comprises from 50 to 95 mol % of silanes having at least one non-hydrolysable group R. With regard to the formulae (II) and (III), the preferred molar ratio of the hydrolysable silane (A1) to the organosilane (A2) in the polycondensate is 5 to 50:50 to 95, preferably from 1:1 to 1:6 and with particular preference from 1:3 to 1:5. A particularly favourable molar ratio is 1:4.
The optional component (B) constitutes glass-forming elements which are preferably dispersible or soluble in the reaction medium. It is possible to use, for example, compounds (halides, alkoxides, carboxylates, chelates, etc.) of lithium, sodium, potassium, rubidium, caesium, beryllium, magnesium, calcium, strontium, barium, boron, aluminium, titanium, zirconium, tin, zinc or vanadium.
To prepare the polycondensate (1), the starting components (A) and, where appropriate, (B) are hydrolysed and condensed. The hydrolysis and condensation are conducted either in the absence of a solvent or, preferably, in an aqueous or aqueous/organic reaction medium, where appropriate in the presence of an acidic or basic condensation catalyst such as HCl, HNO
3
or NH
3
. The hydrolysis and condensation preferably take place in the presence of an aqueous acid. The aqueous acids are used preferably in a concentration range of from 0.1 N to 10.0 N. Acids used with preference are hydrochloric, nitric, phosphoric and acetic acid.
Additionally, during the preparation of the polycondensate, the inorganic particles set out below may be added. During the preparation, preferably, nanoscale inorganic particles, especially in the form of a sol, are added. By way of example, silica sols may act as hydrolytically active compounds in the sol. Suitable for this purpose are commercially customary silica sols, such as the Levasils®, silica sols from Bayer AG, for example.
When a liquid reaction medium is used, the starting components are soluble in the reaction medium. Particularly suitable organic solvents are water-miscible solvents, such as monohydric or polyhydric aliphatic alcohols, for example, but also aliphatic or aromatic hydrocarbons, such as those having from 5 to 20 carbon atoms, ethers, esters, ketones, amides and alkylamides.
The hydrolysis and polycondensation preferably take place under the conditions of the sol-gel process, the reaction mixture being used in the viscous sol state to coat the substrate.
Where appropriate, the hydrolysis and polycondensation are carried out in the presence of a complexing agent, examples of such agents being nitrates, &bgr;-dicarbonyl compounds (e.g. acetylacetonates or acetoacetates), carboxylic acids (e.g. methacrylic acid) or carboxylates (e.g. acetate, citrate or glycolate), betaines, diols, diamines (e.g. DIAMO) or crown ethers.
The ratio of the hydrolytically active components to the hydrolysable silanes (and, where appropriate, to the glass-forming elements) may be characterized by
Benthien Thomas
Faber Stefan
Joerdens Frank
Jonschker Gerhard
Schmidmayer Gerhard
Heller Ehrman White & McAuliffe LLP
Institut für Neue Materialien gem. GmbH
Thornton Krisanne
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