Bleaching and dyeing; fluid treatment and chemical modification – Treatment of hides – skins – feathers and animal tissues – Tanning
Patent
1992-02-10
1994-02-15
Prescott, Arthur C.
Bleaching and dyeing; fluid treatment and chemical modification
Treatment of hides, skins, feathers and animal tissues
Tanning
252 857, C14C 308
Patent
active
052862631
DESCRIPTION:
BRIEF SUMMARY
German Laid-Open Application DOS 3,733,172 discloses fuels for carburetor-type engines which contain, inter alia, small amounts of copolymers of (a) C.sub.1 -C.sub.30 -alkyl vinyl ethers or mixtures of C.sub.1 -C.sub.30 -alkyl vinyl ethers and olefins of 2 to 40 carbon atoms and (b) maleic anhydride and have a molecular weight of from 500 to 20,000 g/mol and in which some or all of the anhydride groups of the copolymers have been reacted with aqueous alkali metal or alkaline earth metal bases and the remainder of the carboxyl groups have been converted with alcohols and/or amines into the corresponding ester and/or amide groups and/or ammonium salts.
German Patent 2,629,748 discloses the use of copolymers of C.sub.10 -C.sub.30 -olefins and maleic anhydride, which are hydrolyzed with alkali metal bases or amines, for filling and fatliquoring leathers and skins. The hydrolyzed copolymers can also be reacted with alkali metal bisulfites. Since the copolymers are prepared in organic solvents and the solvents are not removed, the aqueous copolymer dispersions prepared therefrom contain considerable amounts of organic solvents, for example xylene or dodecylbenzene. Although such dispersions are suitable for fatliquoring leathers and skins, owing to their content of organic solvents they are virtually useless for rendering leathers and skins water-repellent.
U.S. Pat. No. 2,746,837 discloses the treatment of hides, skins and leathers with lower alkyl vinyl ether/maleic anhydride copolymers in which not less than 5 and not more than 15% of the anhydride groups are present in the form of the semi-amide salts of ammonia and lower aliphatic primary and secondary amines. The treatment is carried out with the aid of aqueous solutions of the semi-amide salts of the stated copolymers.
U.S. Pat. No. 2,768,056 discloses a process for impregnating hides and skins at pH 2.5-4.0 with aqueous solutions of hydrolyzed and partially neutralized copolymers of methyl vinyl ether/maleic anhydride copolymers.
It is an object of the present invention to provide an improved agent for rendering leathers and skins water-repellent.
We have found that this object is achieved, according to the invention, by the use of copolymers which are obtainable by free radical copolymerization of -alkyl vinyl ethers and not more than 50 mol % of C.sub.8 -C.sub.40 -monoolefins with subsequent solvolysis of the anhydride groups of the copolymer and partial or complete neutralization of the carboxyl groups formed during the solvolysis, in an aqueous medium by means of a base, and which is present in the form of a 0.5-50% strength by weight aqueous dispersion, as an agent for rendering leathers and skins water-repellent.
The copolymers are disclosed in, for example, German Laid-Open Application DOS 3,733,172. They are prepared by copolymerization of the monomers of group (a) with the monomers of group (b), solvolysis of the anhydride groups of the copolymers and partial neutralization of the carboxyl groups resulting during the solvolysis. Suitable monomers of group (a) are C.sub.8 -C.sub.40 -alkyl vinyl ethers or mixtures of these alkyl vinyl ethers with C.sub.8 -C.sub.40 -monoolefins. The alkyl vinyl ethers include, for example, n-octyl vinyl ether, 2-ethylhexyl vinyl ether, 2,2,4-trimethylpentyl vinyl ether, n-decyl vinyl ether, dodecyl vinyl ether, isododecyl vinyl ether, n-tridecyl vinyl ether, isotridecyl vinyl ether, n-tetradecyl vinyl ether, n-hexadecyl vinyl ether, n-octadecyl vinyl ether, n-eicosyl vinyl ether, n-docosyl vinyl ether, n-tetracosyl vinyl ether, n-hexacosyl vinyl ether, n-octacosyl vinyl ether, oleyl vinyl ether, cyclooctyl vinyl ether and mixtures of the stated alkyl vinyl ethers.
Examples of suitable monoolefins of 8 to 40 carbon atoms are n-oct-1-ene, 2,4,4-trimethylpent-1-ene, 2,4,4-trimethylpent-2-ene, diisobutene, which is available industrially as an isomer mixture of about 80% by weight of 2,4,4-trimethylpent-1-ene and about 20% by weight of 2,4,4-trimethylpent-2-ene, 4,4-dimethylhex-1-ene, dec-1-ene, dodec-1-ene, tetradec-1
REFERENCES:
patent: 2746837 (1956-05-01), Kirk
patent: 2768056 (1956-10-01), Kirk
patent: 4043923 (1977-08-01), Loudas
patent: 4190687 (1980-02-01), Sugiura et al.
Bay Herbert
Denzinger Walter
Greif Norbert
Hartmann Heinrich
Oppenlaender Knut
BASF - Aktiengesellschaft
Prescott Arthur C.
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