Nova Patents
EP0712944A2

Ternary mixtures of solvents and their use for removing oily substances

Abstract

Ternary mixtures, particularly suitable for removing oily substances having both an hyrogenated and fluorinated or mixed basis, essentially consisting of: (a) water; (b) terbutanol; (c) a fluoropolyoxyalkylene having hydrogenated end groups and/or hydrogenated repetitive units. Such mixtures have high flash point, are non toxic and with null depleting potential of the ozone and show a ternary diagram characterized by a wide monophasic zone, wherein the three components form limpid and stable solutions.

EP0712944A2, drawing sheet 1
Sheet 1 of 21

Term

Term ended

Projected expiry passed 30 October 2015, 10.9 years ago.

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9 claims: 5 independent, 4 dependent

  1. 1
    Ternary mixtures essentially formed by:(a) water;(b) terbutanol;(c) a fluoropolyoxyalkylene having hydrogenated end groups and/or hydrogenated repetitive units.
  2. 4
    Ternary mixtures according to anyone of the previous claims, wherein the three components form a sole stable phase.
  3. 5
    Ternary mixtures according to anyone of the previous claims, wherein the fluoropolyoxyalkylene is formed by repetitive units, statistically distributed along the chain, selected from:-CFZO-, -CF₂CFZO-, -CZ₂CF₂CF₂O-, wherein Z is -H or -F, Rf is -CF₃, -C₂F₅, or -C₃F₇. and by hydrogenated end groups selected from -CF₂H, -CF₂CF₂H, -CFH-CF₃, and -CFH-ORf, wherein Rf is defined as above;or perfluorinated end groups selected from -CF₃, -C₂F₅, and -C₃F₇, at least one of the end groups being hydrogenated.
  4. 8
    Ternary mixtures according to claims 6 or 7, wherein the fluoropolyoxyalkylene is selected from the following classes:(a) wherein: T₁ and T₂, equal to or different from each other, are hydrogenated groups -CF₂H, -CFH-CF₃, or perfluorinated groups -CF₃, -C₂F₅, -C₃F₇, at least one of the end groups being hydrognated;X is -F or -CF₃;a, b are such numbers that the boiling temperature is comprised in the range indicated above, a/b is comprised from 5 to 15;(b) T₃-O(CF₂CF₂O)c(CF₂O)d-T₄ wherein: T₃ and T₄, equal to or different from each other, are hydrogenated groups -CF₂H or -CF₂-CF₂H, or perfluorinated groups -CF₃, -C₂F₅, at least one of the end groups being hydrogenated;c, d are such numbers that the boiling temperature is comprised in the range indicated above, c/d is comprised from 0.3 to 5;(c) wherein: T₅ and T₆, equal to or different from each other, are hydrogenated groups -CF₂H, -CF₂CF₂H, or CFH-CF₃, or perfluorinated groups -CF₃, -C₂F₅, -C3F₇, at least one of the end groups being hydrognated;X is -F or -CF₃;e, f, g are such numbers that the boiling temperature is comprised in the range indicated above, e/(f+g) is comprised from 1 to 10, f/g is comprised from 1 to 10;(d) wherein: T₇ and T₈, are hydrogenated groups -CFH-CF₃ or perfluorinated groups -C₂F₅, -C3F₇, at least one of the end groups being hydrogenated;h is such a number that the boiling temperature is comprised in the range indicated above;(e) T₉-O(CZ₂CF₂CF₂O)i-T₁₀ wherein: Z₂ is -F or -H;T₉ and T₁₀, equal to or different from each other, are -CF₂H or -CF₂-CF₂H groups, or perfluorinated groups -CF₃, -C₂F₅, -C3F₇, at least one of the end groups being hydrognated;i is such a number that the boiling temperature is comprised in the range indicated above;(f) wherein: Rf is -CF₃, -C₂F₅, or -C₃F₇;T₁₁ and T₁₂, equal to or different from each other, are groups -CF₂H, -CF₂CF₂H, -CFH-ORf, or perfluorinated groups -CF₃, -C₂F₅, -C₃F₇, at least one of the end groups being hydrogenated;j, k, l are such numbers that the boiling temperture is comprised in the range indicated above, k+l and j+k+l are at least equal to 2, k/(j+l) is comprised from 10⁻² to 10³;l/j is comprised from 10⁻² to 10²;(g) wherein: T₁₃ and T₁₄, equal to or different from each other, are hydrogenated groups -CF₂H, -CFH-CF₃, or perfluorinated groups -CF₃, -C₂F₅, -C₃F₇, at least one of the end groups being hydrogenated;X is -F or -CF₃;m, n, o, p are such numbers that the boiling temperature is comprised in the range indicated above, m/n is comprised from 5 to 40, m/(o+p) is comprised from 2 to 50, o+p is at least 3 or is lower than p;(h) T₁₅-O(CF₂CF₂O)q(CF₂O)r(CFHO)s(CF₂CFHO)t-T₁₆ wherein: T₁₅ and T₁₆, equal to or different from each other, are hydrogenated groups -CF₂H, -CF₂-CF₂H, or perfluorinated groups -CF₃, -C₂F₅, at least one of the end groups being hydrognated;q, r, s, t are such numbers that the boiling temperature is comprised in the range indicated above, q/r is comprised from 0.5 to 2, (q+r)/(s+t) is comprised from 3 to 40, s+t is at least 3, s is lower than t;(i) wherein: T₁₇ and T₁₈, equal to or different from each other, are hydrogenated groups -CF₂H, -CF₂CF₂H, -CFH-CF₃, or perfluorinated groups -CF₃, -C₂F₅, -C₃F₇, at least one of the end groups being hydrogenated;X is -F or -CF₃;u, v, w, x, y are such numbers that the boiling temperature is comprised in the range indicated above, (u+v)/w is comprised from 5 to 40, (u+v)/(x+y) is comprised from 2 to 50, x+y is at least 3, x is lower than y;
  5. 9
    Process for removing oily substances from a substrate which comprises applying on said surface a ternary mixture according to claims from 1 to 8.
Independent claims5