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US 5,683,611 AGranted
Preparations for the oiling of leather
AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsRudolf Zauns-Huber, Fredi Wolter, Guenter Uphues, Gilbert Schenker
Life of this patent
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Abstract
Aqueous dispersions containing special aminopropionic acid derivatives and co-oligomers based on fatty crotonates are suitable for the oiling of leather. The leathers thus treated are distinguished by high resistance to washing and cleaning and by impermeability to water.
Claims22
An aqueous dispersion for oiling leather which comprises:
- (i) at least one aminopropionic acid derivative of the formula:
- ##STR2## wherein R.sup.1 is a saturated or unsaturated, linear or branched alkyl or alkoxyalkyl group containing 8 to 22 carbon atoms,
- R.sup.2 is a group selected from the group consisting of alkyl groups containing 1 to 18 carbon atoms, saturated carboxyalkyl groups containing 3 to 4 carbon atoms unsaturated carboxyalkyl groups containing 3 to 4 carbon atoms, carboxyphenyl groups and carboxyl groups,
- R.sup.3 is hydrogen or a methyl group,
- X is hydrogen, alkali metal, alkaline earth metal, ammonium, alkylammonium or alkanolammonium and
- Y is a group selected from the group consisting of --CO--, --SO.sub.2 --, --CONH and an alkylene group containing up to three carbon atoms;
- and
- (ii) at least one co-oligomer (II) selected from the group consisting of water-dispersible co-oligomers and water-emulsifiable co-oligomers formed from co-monomers comprising
- (a) fatty crotonates;
- (b) at least one member selected from the group consisting of radical-copolymerizable, hydrophilic, ethylenically unsaturated acids and anhydrides thereof;
- (c) up to 30% by weight based on a sum of (a)+(b)+(c) of copolymerizable monomers which are not (a) or (b);
- and
- (iii) water wherein a weight ratio of (a):(b) is from 30:70 to 90:10 and wherein a sum of the weight of (i) and (ii) in the dispersion is at least 35% by weight of active components in the dispersion.
10 more elements
A method for oiling leather which comprises impregnating the leather with an aqueous dispersion comprising:
- (i) at least one aminopropionic acid derivative of the formula:
- ##STR3## wherein R.sup.1 is a saturated or unsaturated, linear or branched alkyl or alkoxyalkyl group containing 8 to 22 carbon atoms,
- R.sup.2 is a group selected from the group consisting of alkyl groups containing 1 to 18 carbon atoms, saturated carboxyalkyl groups containing 3 to 4 carbon atoms, unsaturated carboxyalkyl groups containing 3 to 4 carbon atoms, carboxyphenyl groups and carboxyl groups,
- R.sup.3 is hydrogen or a methyl group,
- X is hydrogen, alkali metal, alkaline earth metal, ammonium, alkylammonium or alkanolammonium and
- Y is a group selected from the group consisting of --CO--, --SO.sub.2 --, --CONH and alkylene groups containing up to three carbon atoms;
- (ii) at least one co-oligomer (II) selected from the group consisting of water-dispersible co-oligomers and water-emulsifiable co-oligomers formed from co-monomers comprising
- (a) fatty crotonates;
- (b) at least one member selected from the group consisting of radical-copolymerizable hydrophilic ethylenically unsaturated acids and anhydrides thereof;
- and
- (c) up to 30% by weight based on a sum of (a)+(b)+(c) of copolymerizable monomers, which are not (a) or (b);
- and
- (iii) water wherein a weight ratio of (a):(b) is from 30:70 to 90:10 and wherein a sum of the weight of (i) and (ii) in the dispersion is at least 35% by weight of active components in the dispersion.
10 more elements
Dependencies are inferred from the claim text.