Leather modifier, process for modifying leather and modified tanned leather
AssigneeDaikin Industries, Ltd.
InventorsTetsuya Masutani, Masato Kuroi, Yasuo Itami, Masahiko Maeda, Norio Yanagisawa, Yoshihiko Misugi, Maki Yasuhara
Life of this patent
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Abstract
A leather modifier containing a compound which is obtainable through a reaction of an ethylene oxide derivative having a fluorine-containing group with a phosphorus compound is disclosed. A leather treated with the modifier has much improved properties.
Claims13
A method for preparing a leather modifier having a mixture of the compounds ##STR8## wherein n is an integer of 2 or larger, and R.sub.f and R.sup.1 are defined below,
- comprising the step of reacting an ethylene oxide compound having a fluorine group of the formula ##STR9## wherein R.sub.f is a C.sub.3 -C.sub.21 fluoroalkyl group, fluoroalkenyl group or fluoroether group or a mixture thereof;
- and R.sup.1 is a group of the formula:
- ##STR10## wherein R.sup.2 is a C.sub.1 -C.sub.20 alkylene group or a phenylenemethylene group, wherein the substituents on the carbon atoms of R.sup.2 are hydrogen or halogen atom;
- R.sup.3 is a C.sub.1 -C.sub.5 alkyl or hydroxyalkyl group;
- and m is 1;
- with a phosphorus compound selected from the group consisting of pyrophosphoric acid, polyphosphoric acid and phosphorus pentoxide.
A modified tanned leather that has been contacted in a fatting step with a leather modifier in place of or in combination with a fatting agent, wherein said leather modifier comprises a mixture of the compounds ##STR11## wherein n is an integer of 2 or greater;
- R.sub.f is a C.sub.3 -C.sub.21 fluoroalkyl group, fluoroalkenyl group or fluoroether group or a mixture thereof;
- and R.sup.1 is a group of the formula:
- ##STR12## wherein R.sup.2 is a C.sub.1 -C.sub.20 alkylene group or a phenylenemethylene group, wherein the substituents on the carbon atoms of R.sup.2 are hydrogen or halogen atom;
- R.sup.3 is a C.sub.1 -C.sub.5 alkyl or hydroxyalkyl group;
- and m is 1.
A process for modifying a leather, which comprises tanning a leather and contacting the tanned leather in a fatting step with a leather modifier in place of or in combination with a fatting agent, wherein said leather modifier comprises a mixture of the compounds ##STR13## wherein n is an integer of 2 or greater, and R.sub.f and R.sup.1 are defined below,
- and is produced by reacting an ethylene oxide compound having a fluorine group of the formula:
- ##STR14## wherein R.sub.f is a C.sub.3 -C.sub.21 fluoroalkyl group, fluoroalkenyl group or fluoroether group or a mixture thereof;
- and R.sup.1 is a group of the formula:
- ##STR15## wherein R.sup.2 is a C.sub.1 -C.sub.20 alkylene group or a phenylenemethylene group wherein the substituents on the carbon atoms of R.sup.2 are hydrogen or halogen atom;
- R.sup.3 is a C.sub.1 -C.sub.5 alkyl or hydroxyalkyl group;
- and m is 1;
- with a phosphorus compound selected from the group consisting of pyrophosphoric acid, polyphosphoric acid and phosphorus pentoxide.
A leather modifier that is produced by reacting an ethylene oxide compound having a fluorine group selected from the group consisting of ##STR16## with a phosphorus compound selected from the group consisting of pyrophosphoric acid, polyphosphoric acid and phosphorus pentoxide;
- at a reaction temperature from 30.degree.-200.degree. C. for 0.5-15 hours;
- and the ratio of the moles of ethylene oxide compound to the moles of phosphorus atom in the phosphorus compound is from 0.3 to 3 moles per mole of phosphorus atom.
A leather modifier that is produced by reacting an ethylene oxide compound having the formula ##STR17## with a phosphorus compound selected from the group consisting of pyrophosphoric acid, polyphosphoric acid and phosphorus pentoxide;
- at a reaction temperature from 30.degree.-200.degree. C. for 0.5-15 hours;
- and the ratio of the moles ethylene oxide compound to the moles of phosphorus atom in the phosphorus compound is from 0.3 to 3 moles per mole of phosphorus atom.
Dependencies are inferred from the claim text.