Fibre reactive polymers

Details Fibre reactive polymers Fibre reactive polymers

1998-03-27

1999-08-03

Lipman, Bernard

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526248, 526249, C08F 1230

Patent

active

059326727

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a group of polymers suitable for binding to cellulose or woollen based material and is useful for the treatment of cloth, linen fabric and the like.
The durability of certain functional treatments (e.g. water or oil repellency) on cellulose based fabrics can by improved by the addition of cross-linkable resins to their formulations. Depending on the type of resin employed, fixation to the cloth may occur under acidic conditions (eg with dimethyloldihydroxyethylene urea) or under neutral conditions (eg with a blocked polyisocyanate).
The use of certain groups, for example triazines, to bind molecules to cellulose based, and other, materials is known from the chemistry of reactive dyes. For example, the 2,4-dichloro-6-aminotriazyl group is used to bind a family of dyes, known commercially as Procion dyes, to cellulose materials (see for example, The Chemistry of Synthetic Dyes, Vol. IV--Reactive Dyes, K Venkataraman Ed., Academic Press.).
The use of fluoroalkyl compounds to improve the oil and water repellency of articles is described, for example, in GB 1,102,903. These compounds are non-polymeric and the invention described therein requires the use of organic solvents whereas the current invention may be carried out in aqueous solvents.
Whilst resin treatments can improve the durability of certain finishes and impart dimensional stability and durable press properties to fabrics, the acid catalysts required to bring about the cross-linking reactions can damage acid sensitive cloth such as cotton. Moreover, excessive cross-linking can also lead to a reduction in abrasion resistance (see for example Textile Chemist and Colorist, 1995, Vol. 27, page 17, R J Harper and Melliand Textilber., 1986, Vol. 67, p.E61-5, J. Hearle). Problems also arise with resins that contain formaldehyde and this has prompted considerable research into the development of cross linking agents that do not contain this compound (see for example Textile Res. J., 1994. Vol. 64, page 247, N. R. Bertoniere et al).
According to this invention, a polymer for the treatment of materials is characterised by a plurality of side groups of general formula --A--Az, where: O, CO.sub.2, OCO, ##STR1## where X.sub.1, X.sub.2 etc are independently selected from halogen, --NHR, --SO.sub.2 CH.sub.3, Alkl, Aryl, is halogen;
In a preferred embodiment, the polymer also contains fluorine bearing side groups.
In a further preferred embodiment, the polymer also contains side groups bearing R.sub.f where: ##STR2##
In a further preferred embodiment, the polymer contains the side group --CO.sub.2 R.sub.f.
In a further preferred embodiment the polymer has the repeat unit: ##STR3##
According to a second aspect of the invention a material is provided with improved physical properties by virtue of treatment of said material with the polymer of the first aspect of the invention.
According to a third aspect of the invention, a method is provided of treating a material with the polymer of the first aspect of the invention. Preferrably the material is treated in an aqueous solution.
Durability of the polymers may be further improved by the addition of polyhydric alcohols.
The invention will now be described, by way of non-limiting example, with reference to FIG. 1 which shows the reaction scheme during the production of a polymer used in a particular embodiment of the invention. Although the following example relates to the treatment of fabrics to improve their oil and water repellent properties, this should not be seen as limiting. The invention may be used inother situations where treatment of material with a polymer may improve physical properties eg. abrasion resistance or fire rerdance.


EXPERIMENTAL

Referring to FIG. 1, a solution of 1250 parts surfactant FC 126 (available from Fluorochem Ltd.) in 60000 parts distilled water was added to a stirred solution containing 1050 parts 2,4-dichloro-6-(N-(2-acrylyl)ethylamnino)-s-triazine 1,22500 parts 2-(N-ethylperfluorooctylsulphonamide)ethyl acrylate 2, and 125 parts octanethiol (C.sub.8

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