Stock material or miscellaneous articles – Composite – Of silicon containing
Reexamination Certificate
2001-11-08
2004-04-06
Peng, Kuo-Liang (Department: 1712)
Stock material or miscellaneous articles
Composite
Of silicon containing
C528S901000, C528S401000, C528S042000, C528S012000, C528S025000, C528S036000, C528S425000, C568S677000, C525S403000, C525S474000, C525S475000, C525S477000, C556S458000, C427S387000, C524S588000, C524S612000
Reexamination Certificate
active
06716534
ABSTRACT:
The present invention relates to a composition comprising at least one fluorochemical polyether silane compound having a polyfluoropolyether segment and at least two hydrolysable silane groups per molecule with one or more non-fluorinated compounds having at least two hydrolysable groups per molecule. The present invention also relates to a composition comprising a partial condensate resulting from a partial condensation reaction between the fluorochemical polyether silane compound having a polyfluoropolyether segment and at least two hydrolysable silane groups per molecule with one or more non-fluorinated compounds having at least two hydrolysable groups per molecule. The present invention also relates to the use of the compositions for providing durable repellency to water, oil and stain to a substrate.
In the past, various efforts have been made to provide repellent properties to a substrate. For example, U.S. Pat. No. 4,687,707 (=EP-A-0 166 363) describes a low reflectance, transparent material having anti-soiling properties, which comprises a transparent substrate having a coating comprising a thin layer of a condensation product of a fluorine containing silicon compound having a polyfluorinated or perfluorinated carbon chain.
WO 99/03941 relates to a coating material comprising condensates of at least one compound (A) of the general formula R
a
MZ
b
(a=0 to 3; b=1 to 4; a+b=3, 4), and at least one compound (B) of the general formula R′
x
MZ
y
(x=1 to 3; y=1 to 3; x+y=3,4), wherein R is a non-hydrolysable organic group, M is an element selected from the main groups III to V or from the subgroups II to IV of the periodic table of elements, Z is a hydrolysable group, and at least one R′ contains a perfluoropolyether structure separated from M by at least two atoms, and at least one R is not equal to at least one R′. The composition is used to provide oleophobic properties to substrates, such as porous polymers.
U.S. Pat. No. 5,739,369 (=EP-A-0 738 771) relates to a water-soluble surface treating agent comprising the reaction product of (A) a fluoroalkyl group-containing alkoxysilane with (B) an amino-group-containing alkoxysilane and optionally further with (C) an alkyl group-containing alkoxysilane. The agent is diluted with water to form a solution for treating glass and other substrates to impart thereto properties, such as water repellency.
U.S. Pat. No. 5,919,886 relates to a fluorine-containing organo-silicon compound useful for obtaining elastomers and to room temperature curable silicon compositions containing the same compound.
U.S. Pat. No. 5,306,758 (=EP-A-0 433 070) describes fluorocarbon based, curable, crosslinkable compositions and coatings prepared therefrom that can be used to form low-surface energy release liners.
U.S. Pat. No. 5,922,787 (=EP-0 797 111) relates to a composition containing an alkoxy-silane compound having a perfluoropolyether group. The composition may be used for forming an anti-fouling film.
However, our findings indicate that while some of the previously known surface coatings may be capable of providing acceptable levels of initial repellent properties, a loss of repellency is often encountered due to abrasion of the coating.
Accordingly, it is desirable to provide a coating composition capable of providing a highly durable water, oil and/or stain repellent coating on a substrate. In particular, it is desirable to provide a durable coating wherein the initial, repellent properties are substantially maintained, even under abrading conditions. Further, the coating compositions preferably can be applied and used in an environmental friendly way and can be produced in a reliable, convenient and cost effective way. Additionally, the coatings desirably have a good durability against exposure to UV light, i.e. the repellency properties do not substantially degrade upon exposure to UV light. Furthermore, it is desirable to obtain optically clear coatings in particular when transparent substrates such as glass are to be treated with the compositions. It would also be desirable to obtain the desired repellency properties without the need for subjecting the coated substrate to a heat treatment at elevated temperature.
SUMMARY OF THE INVENTION
In one aspect, the present invention provides a composition comprising (A) one or more fluorochemical polyether silane compound(s) having a polyfluoropolyether segment and at least two silane groups —Si(Y)
3-x
(R
1
)
x
per molecule, wherein R
1
represents an alkyl group, Y represents a hydrolysable group and x is 0 or 1; and (B) a substantial amount of one or more non-fluorinated compounds of an element M selected from the group consisting of Si, Ti, Zr, B, Al, Ge, V, Pb, Sn and Zn and having at least two hydrolysable groups per molecule. In another aspect the present invention provides the reaction product of (A) and (B).
In a further aspect, the present invention provides a composition derivable from a partial condensation of the above defined composition. By “partial condensation” and “partial condensate” in connection with the present invention is meant that some of the hydrolysable groups in the mixture have reacted while leaving a substantial amount of hydrolysable groups available for a condensation reaction. Typically, a partial condensate means that at least 20%, preferably at least 30%, more preferably at least 50% of the hydrolysable groups are still available for condensation reaction.
In a still further aspect, the present invention also provides a method for treating a substrate, comprising the step of applying to at least a portion of the surface of the substrate the compositions as defined above. The fluorochemical compositions of the present invention can be used to treat substrates and are capable of rendering such substrates oil and water repellent and/or to provide stain repellency thereto.
The compositions are generally effective at low levels of application and have good durability. The compositions are particularly useful for rendering substrates such as ceramics, glass, inox and chromated steel, repellent to water and/or oil.
In a further aspect, the present invention also provides for compositions from which a composition as defined above can be readily prepared. Such compositions comprise components (A) and (B) and are substantially free of water. By substantially free of water is meant that the compositions do not contain water or the amount of water is so low that reaction between components (A) and (B) does not occur in such composition. Preferably, these compositions are also free of acid or base catalyst and will conveniently contain an amount of organic solvent so as to obtain a homogeneous mixture.
By the term “homogeneous mixture” in connection with the present invention is meant that the composition is stable, for at least 24 hours, preferably 1 month, at room temperature. Some haziness may occur, however without substantial precipitation or phase separation occurring.
The term “hydrolysable group” in connection with the present invention refers to a group which either is directly capable of undergoing condensation reactions under appropriate conditions or which is capable of hydrolyzing under appropriate conditions, thereby yielding a compound, which is capable of undergoing condensation reactions. Appropriate conditions include acidic or basic aqueous conditions, optionally in the presence of a condensation catalyst.
Accordingly, the term “non-hydrolysable group” as used in the present invention refers to a group not capable of either directly undergoing condensation reactions under appropriate conditions or of hydrolyzing under the conditions listed above for hydrolyzing the hydrolyzable groups.
The term “substantial amount” of a compound as used herein refers to an amount of a compound greater than a catalytic amount of that compound necessary for promoting a certain reaction (e.g., condensation reactions). Accordingly, a composition comprising a substantial amount of
Dams Rudolf J.
Fieuws Franceska M.
Moore George G. I.
Piessens Guido P.
3M Innovative Properties Company
Kokko Kent S.
Peng Kuo-Liang
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