Use of copolymers having polysiloxane units in the treatment of

Details Use of copolymers having polysiloxane units in the treatment of Use of copolymers having polysiloxane units in the treatment of

1994-05-25

1995-07-18

Willis, Jr., Prince

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 9421, 8 9422, 8 9418, 252 857, C14C 900, C14C 902

Patent

active

054337534

DESCRIPTION:

BRIEF SUMMARY
This application is a 371 of PCT/EP92/02698 filed Nov. 24, 1992.
The present invention relates to the use of specific copolymers in which monomers with a polysiloxane group are included by polymerization in the treatment of leather and furs. Soft, full leather or comfortably soft furs with excellent water-repellent properties are obtained by this treatment.
EP-A-O 372 746 describes an agent for the treatment of leather, which is based on an amphiphilic copolymer the major part of which consists of at least one hydrophobic monomer selected from long-chain alkyl(meth)acrylates, long-chain alkoxy or alkylphenoxy(polyethyleneoxide) (meth)-acrylates, alpha-olefins, vinyl esters of long-chain carboxylic acids and mixtures thereof, and a minor amount which consists of at least one hydrophilic, water-soluble, ethylenically unsaturated acidic or basic monomer. Leather treated with these polymers exhibits a soft feel, however, has poor hydrophobic properties which can only be improved by subsequent, fixing with tanning mineral salts.
For reasons of environmental impact, the use of tanning mineral salts in the leather industry has to be reduced considerably. Secondary fixing with mineral salts is no longer desirable and, in addition, requires an additional process step.
German Offenlegungsschriften [publication of a patent application] Nos. 39 26 168, 39 26 167, 39 31 039 describe copolymers of long-chain alkylvinyl ethers and unsaturated dicarboxylic anhydrides, or long-chain olefins and unsaturated dicarboxylic anhydrides, or long-chain, unsaturated esters and unsaturated carboxylic acids, respectively, in the hydrophobing of leathers. In the Bally-Penetrometer, the finished leathers exhibit a water-absorption of 19.5% (e.g. DE-OS 39 31 039).
DE-OS 38 00 629 describes carboxyl-groups-containing polysiloxanes in neutralized form--the functionality amounts to 2--which are used to render leather and furs water-repellent.
EP-A-O 408 311 relates to a polymer which is used as hair conditioner and comprises 0 to 84.9%-wt. of a hydrophobic, ethylenically unsaturated monomer, 0.1 to 85%-wt. of an ethylenically unsaturated monomer with a polysiloxane group, wherein the monomer exhibits at least one unsaturated, radically polymerizable group and a polysiloxane group according to the formula ##STR1## in which a=1 to 150, and 15 to 99.9%-wt. of a hydrophilic, ethylenically unsaturated monomer selected from radically polymerizable cationic, artionic, non-ionic or amphoteric monomers. For the purpose of hair conditioning, it is preferred to use a polymer consisting of 40 to 84.5%-wt. of the hydrophobic monomer, 0.5 to 70%-wt. of the polysiloxane-groups-containing monomer, and 15 to 59.5%-wt. of the hydrophilic monomer. The quantity of hair conditioner in conventional cosmetic preparations amounts of 0.1 to 10%-wt.
It is the object of the present invention to use the copolymers known from EP-A-408 311 for a new application, namely in the treatment of leather and furs.
The hydrophobing of leather with polysiloxanes carried out from an organic solution or aqueous emulsion is also known from the prior art. If an aqueous emulsion is used, the emulsifier system required for the preparation of the emulsion must be inactivated by the addition of tanning mineral salts, this is an undesired method as mentioned above.
Since the unbonded polysiloxanes migrate within the leather, they cause difficulties with respect to the adhesive strength of the finishing materials and in the glueing of leathers, e.g., in the production of footwear, irrespective of the form of application.
In particular, it is the object of the present invention to provide an improved treatment of leather and furs with respect to softness, feel and their water-repellent properties with the help of polysiloxane-copolymers that do not contain emulsifiers and eliminate the above-mentioned disadvantages.
According to the present invention, this object is achieved by the treatment of leather and furs, for the purpose of softening, fat-liquoring or hydrophobing them, with copolym

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