Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2000-04-14
2003-01-28
Moore, Margaret G. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C106S287120, C106S287130, C528S034000, C528S039000, C525S100000, C525S104000, C525S106000, C525S431000, C525S446000
Reexamination Certificate
active
06512059
ABSTRACT:
BACKGROUND OF INVENTION
The present invention relates to a composition to a process for its preparation and to a method of coating shaped articles or elastomeric materials.
FIELD OF INVENTION
It is known that silicone rubber surfaces have high coefficients of static and sliding friction. Silicone rubbers with a Shore A hardness of below 70 in particular exhibit highly blocking properties and are easily soiled.
AT-250682 describes a process for the coating of a base material, in which the base material is coated with an aqueous solution of the hydrolysates of an organosilane which has an acryloxy radical, and is cured. In a second step, the prime surface is coated with a polymerizable resin, especially polyester resin. This process serves to increase the strength of compression moldings or laminates.
EP 220 804 describes a glass fabric which has a first layer of a polydiorganosiloxane which contains methyl and phenyl groups in a ratio of 0.25 to 3.7, compared with a coating which has only methyl groups, the glass fabric coated with the polydiorganosiloxane being transparent or translucent. A second layer then consists of a polydimethylsiloxane. A third polyorganosiloxane layer is applied to this second layer.
U.S. Pat. No. 4,489,127 describes coatings for fibreglass roofs, which comprise diorganosiloxanes which contain dimethylsiloxane units and phenylmethyl units and copolymers of R
3
SiO
1/2
in SiO
4/2
units.
U.S. Pat. No. 3,639,155 describes dirt-repellent organosiloxane coatings which comprise dimethylsiloxane units, phenylmethylsiloxane units and monomethylsiloxane units, and also organosiloxane units which contain Si-bonded acetoxy, alkoxy or ketoxy groups.
A disadvantage of the prior art is that the known coatings, owing to the content of phenyl groups, give off aromatic substances when heated or in the event of fire. Further disadvantages of the prior art are that the coefficient of friction is unchanged or reduced only insignificantly, and that phenyl radicals on the silicon are difficult to attain.
SUMMARY OF INVENTION
The object of the present invention is to improve the known coatings and to provide coatings having improved dirt-repellent properties and a lower coefficient of friction.
The present invention relates to a composition which can be prepared using
(1) polymer components selected from the group consisting of
(A1) polyorganosiloxanes comprising units (T units) of the formula (R
1
Si—O
3/2
) and optionally, units (M units) of the formula (R
3
Si—O
1/2
)
(A2) polyorganosiloxanes comprising units (Q units) of the formula (Si—O
4/2
) and, optionally, units (M units) of the formula (R
3
Si—O
1/2
)
in which
R is identical or different and represents unhalogenated or halogenated hydrocarbon radicals having 1 to 18 carbon atom(s) per radical or OR
1
, where
R
1
is identical or different and represents hydrogen or a monovalent, unsubstituted or substituted hydrocarbon radical having 1 to 8 carbon atom(s),
with the proviso that there are from 0.01% to 3.0% by weight, preferably from 0.01% to 1% by weight, of Si-bonded radicals OR
1
(B) vinyl chloride-hydroxypropyl acrylate copolymers,
(C) vinyl acetate-ethylene copolymer,
(D) polyvinyl chloride,
(E) polyamide,
(F) polyester,
(G) acrylate-polyester copolymers,
(H) polyamide-polyester copolymers,
(I) vinyl acetate-polyester copolymers, and
(J) Monomeric (meth)acrylates, with the proviso that they are copolymerized with Si-bonded (meth)acrylate group-containing silanes,
(2) a silane of the formula R
3
x
Si(OR
2
)
4−x
, where
R
2
is a monovalent, unsubstituted or substituted hydrocarbon radical,
R
3
is a monovalent organic radical,
x represents 0 or 1,
(3) optionally, a solvent,
(4) optionally, a catalyst and
(5) optionally, water.
Examples of radicals R are preferably alkyl radicals, such as the methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl and tert-pentyl radical; hexyl radicals, such as the n-hexyl radical; heptyl radicals, such as the n-heptyl radical; octyl radicals, such as the n-octyl radical and iso-octyl radicals such as the 2,2,4-trimethylpentyl radical; nonyl radicals, such as the n-nonyl radical; decyl radicals, such as the n-decyl radical; dodecyl radicals; such as the n-dodecyl radical; octadecyl radicals, such as the n-octadecyl radical; alkenyl radicals, such as the vinyl and the allyl radicals; cycloalkyl radicals, such as cyclopentyl, cyclohexyl, cycloheptyl radicals and methylcyclohexyl radicals.
Examples of substituted radicals R are cyanoalkyl radicals, such as the &bgr;-cyanoethyl radical, and halogenated hydrocarbon radicals, for example haloalkyl radicals, such as the 3,3,3-trifluoro-n-propyl radical, the 2,2,2,2′,2′,2′-hexafluoroisopropyl radical, the heptafluoroisopropyl radical.
On the grounds of greater ease of accessibility, methyl or ethyl radicals are preferred as radical R.
Radical R
1
is preferably hydrogen atom and unsubstituted or substituted hydrocarbon radicals having 1 to 8 carbon atom(s), in which context hydrogen and alkyl radicals having 1 to 3 carbon atom(s), especially the methyl, ethyl, and isopropyl radical, are more preferred.
Examples of radicals R
1
are the examples given for the radical R which have 1 to 8 carbon atom(s).
Examples of radicals R
2
are preferably unsubstituted or substituted hydrocarbon radicals having 1-18 carbon atom(s), more preferably alkyl radicals, such as the methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl, tert-pentyl radical; hexyl radicals, such as the n-hexyl radical and isohexyl radicals; heptyl radicals, such as the n-heptyl radical and isoheptyl radical; octyl radicals, such as the n-octyl radical and isooctyl radicals, such as the 2,2,4-trimethylpentyl radical. The methyl and ethyl radical is preferred. Examples of hydrocarbon radicals R
2
which can be substituted by an ether oxygen atom are the methoxyethyl, the ethoxyethyl, the methoxy-n-propyl and the methoxy-isopropyl radical.
Examples of radicals R
3
are preferably unsubstituted or substituted hydrocarbon radicals having 1-18 carbon atom(s), more preferably alkyl radicals, such as the methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl, tert-pentyl radical; hexyl radicals, such as the n-hexyl radical and isohexyl radicals; heptyl radicals, such as the n-heptyl radical-and isoheptyl radical; octyl radicals, such as the n-octyl radical and isooctyl radicals, such as the 2,2,4-trimethylpentyl radical; nonyl radicals, such as the n-nonyl radical and isononyl radicals; decyl radicals, such as the n-decyl radical and isodecyl radicals; dodecyl radicals, such as the n-dodecyl radical and isododecyl radicals; octadecyl radicals, such as the n-octadecyl radical and isooctadecyl radicals; alkenyl radicals, such as the vinyl and the allyl radicals; cycloalkyl radicals, such as cyclopentyl, cyclohexyl, cycloheptyl radicals, and methylcycloheptyl radicals; aryl radicals, such as the phenyl, naphthyl, anthryl and phenanthryl radicals; alkaryl radicals, such as o-, m-, p-tolyl radicals, xylyl radicals, ethylphenyl radicals, o-, m-, p-vinylphenyl radicals and the nonylphenyl radical; and aralkyl radicals, such as the benzyl radical, the &agr;- and the &bgr;-phenyl ethyl radical; isocyanoalkyl radicals such as the isocyanopropyl radical, isocyanoethyl radical, isocyanohexyl radical, isocyanooctyl radical, the isocyanopropyl radical being preferred, and (meth)acryloxy radical such as the methacryloxypropyl radical, acryloxypropyl radical, methacryloxyhexyl radical, acryloxyhexyl radical, the methacryloxypropyl radical being preferred.
Examples of halogenated hydrocarbon radicals R are haloalkyl radicals, such as the 3-chloro-n-propyl radical, the 3,3,3-trifluoro-n-propyl radical, the 2,2,2,2′,2′,2′-hexafluoroisopropyl radical the heptafluoroisopropyl radical, and haloaryl radicals, such as the o-, m- and p-chlorophenyl radical.
In the polyorganosiloxanes (A1) the ratio of M units to T units is f
Brooks & Kushman P.C.
Moore Margaret G.
Wacker-Chemie GmbH
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