Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2002-09-13
2004-10-12
Peng, Kuo-Liang (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C528S031000, C528S025000, C556S445000, C568S673000, C008S128300
Reexamination Certificate
active
06803407
ABSTRACT:
This invention relates to specific organopolysiloxane compositions and to their use for treating fiber materials, especially textile fabrics in the form of wovens, knits or nonwovens.
It is known to treat textile fabrics with compositions which include polysiloxanes to control textile water repellency, hydrophilicity and hand, depending on the choice of polysiloxane. The compositions usually used for this purpose are aqueous solutions or dispersions which include the desired polysiloxanes. A particularly soft hand is obtainable when the organopolysiloxanes have side chains that contain amino groups.
Textile fabrics have also been treated using organopolysiloxanes which contain polyoxyethylene groups with or without polyoxypropylene groups. Such polysiloxanes and their use are described in EP 578 144 A2, DE-A 26 07 469, DE-B 39 28 867, EP 494 683 A1 and WO 99/47111.
Textile fabrics have also been treated using polysiloxanes having Si—OH bonds, for example &agr;,&ohgr;-dihydroxypolydimethylsiloxanes, also polysiloxanes containing Si—H bonds, for example polyalkylhydrosiloxanes as described in Ullmanns Encyklopädie der technischen Chemie, 4th edition, Volume 23, 1983, page 82/83, Verlag Chemie, Weinheim, Germany. The use of hydropolysiloxanes is also disclosed in GB-A 2 082 215. Polysiloxanes containing Si—H bonds and their use are also described in EP-A 755 960 and EP-A 755 961.
Although prior art silicone textile finishes have some advantages, they are not in every respect optimal. For instance, in many cases it is not possible to control the hydrophilic properties of the finished fiber materials with these known polysiloxanes in a specific manner. Another problem is the frequently inadequate durability of the effects, especially after the textile has been washed.
It is an object of the present invention to provide polysiloxane compositions which confer a pleasantly soft hand on fiber materials treated therewith and which also make it possible to influence the hydrophilic/hydrophobic properties of fiber materials in a specific manner and which lead to excellent durability for the effects mentioned.
This object is achieved by a polysiloxane composition preparable by reacting a linear organopolysiloxane whose chain ends are formed by R
3
SiO— units and which has on average two or more —Si(R)(H)—O— units in the chain with a compound of the formula (I)
CH
2
═C(R
1
)&Parenopenst;CH
2
&Parenclosest;
m
—O&Parenopenst;CH
2
CH
2
O&Parenclosest;
x
&Parenopenst;CHR
2
—CHR
3
—O&Parenclosest;
y
&Parenopenst;&Parenopenst;CH
2
&Parenclosest;
4
—O&Parenclosest;
z
R
1
(I)
where the individual —CH
2
CH
2
O—, —CHR
2
—CHR
3
—O— and (CH
2
)
4
—O units may be distributed in the chain of the compound of the formula (I) in any desired pattern, this reaction being carried out in such a way that the resultant product still contains Si—H bonds and the resultant product is admixed with water or a protic acid or a base, the base being an amino-functional organopolysiloxane or a mixture of an alcohol of 5 to 50 carbon atoms and an alkali metal alkoxide or a mixture of water and a strong inorganic base, wherein every R is independently phenyl or alkyl of 1 to 4 carbon atoms, R
1
is H or R, one of R
2
and R
3
is H and the other is CH
3
and wherein
m is from 1 to 8, preferably 1,
x is from 2 to 40,
y is from 0 to 10, and
z is from 0 to 10.
The compositions of the invention are very useful for treating fiber materials, especially textile and fabrics in the form of wovens, knits or nonwovens. For this they are preferably used in the form of aqueous dispersions or solutions and can be applied to these fabrics in the course of the textile finishing process, for example after a dyeing step, using known methods, for example by padding. The fabrics can be composed of a variety of materials such as wool, cotton, regenerated cellulose or synthetics such as polyester or polyamide. Similarly, textile fabrics composed of blends of fibers, for example fibers of the type mentioned, can be treated with compositions according to the invention. The finishing liquors here may include further customary textile finishing additives, for example flame retardants or cellulose crosslinkers.
By choosing compositions according to the invention in a specific manner, the hydrophilic/hydrophobic properties of the fiber materials treated can be influenced in a specific manner. For instance, raising the degree of ethoxylation (=raising the value of x in the compounds of formula (I)) imparts enhanced hydrophilicity to the fiber materials. When x, y and z in formula (I) have suitable values it is possible to obtain compounds according to the invention that are self-dispersing or soluble in water without use of dispersants. Compounds according to the invention may frequently even function efficiently as dispersants for dispersing other products in water or in oil, ie. for preparing O/W or W/O emulsions, including for cosmetic purposes. Compounds according to the invention confer on textile fabrics, for example garments, a pleasant, very soft hand even without the presence of amino groups or without the additional use of soft-hand agents. If desired, however, soft-hand agents of the type customary in the textile finishing industry may be used in addition.
The effects provided by compositions according to the invention possess good durability, even after the textiles have been washed. A possible explanation is that the compositions contain Si—H bonds or Si—OH bonds and so are crosslinkable with themselves or with the fiber material, for example in the case of the use of a customary cellulose crosslinker, or else that a crosslinking reaction has taken place even before the application to the fiber material, for example because an amino-functional polysiloxane has been used as a base in the synthesis. These matters will be discussed hereinbelow.
Compounds according to the invention are obtainable by first reacting a linear organopolysiloxane of the hereinbelow described type with a compound of the formula (I) and subsequently adding water and acid or a base of the hereinbelow designated type. The organopolysiloxane used for the reaction mentioned is linear, ie. all the silicon atoms it contains are situated in a single polymer chain. This chain preferably contains 10 to 500 silicon atoms. The ends of this chain are formed by R
3
Si—O— units. Every R is independently a phenyl radical or a linear or branched alkyl radical of 1 to 4 carbon atoms. Preferably R is methyl. This applies not only to the chain ends, but also to the other R-containing groups in the polysiloxanes used. Similarly, in the compounds of the formula (I) R is preferably CH
3
when R
1
═R.
The polysiloxane chain in the linear organopolysiloxanes used as a starting compound shall contain at least two —Si(R)(H)—O— units on average. It may also contain more such units. These units contain an Si—H bond as well as an Si—R bond. This Si—H bond is reactive and capable of crosslinking, condensation and addition reactions. When the polysiloxanes are reacted with compounds of the formula (I), an Si—H unit is added to the C═C double bond of a compound of the formula (I).
The statement made above and in claim
1
, that the organopolysiloxane used shall on average contain two or more —Si(R)(H)—O— units, means the following: polymer syntheses will for known reasons virtually always give rise to mixtures of products that differ in chain length among other respects. It is therefore possible that some molecules of the organopolysiloxanes which can be used for preparing compositions according to the invention contain only one or no unit of the formula —Si(R)(H)—O—. However, the majority of the molecules shall contain at least two such units and on average the organopolysiloxane used shall contain two or more such units, ie. the total number of such units present has to be at least 2 n, where n is the number of molecules of the organopolysiloxane. Preferably, 20 to 100% of the silicon atoms in the organopolysiloxane used for the reaction, except for the two sili
Chrobaczek Harald
Dirschl Franz
Goretzki Ralf
Tschida Günther
Ciba Specialty Chemicals Corporation
Mansfield Kevin T.
Peng Kuo-Liang
LandOfFree
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