Dispersions of copolymers containing perfluoroalkyl groups

• US 5,093,398 A
• Filed: 10/03/1990
• Issued: 03/03/1992
• Est. Priority Date: 10/27/1989
• Status: Expired due to Fees

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: Maurer, Werner, Rottger, Jutta, Kortmann, deceased, Wilfried, Meyer, Rolf-Volker, Selinger, Peter, Passon, Karl-Heinz
• Primary Examiner(s): Schofer, Joseph L.
• Assistant Examiner(s): Cheng, Wu C.
• Application Number:
  US07/592,142
• Time in Patent Office: 517 Days
• Field of Search: 524/322, 524/319
• US Class Current: 524/322
• CPC Class Codes: D06M 15/277 containing fluorine

Abstract

Aqueous dispersions of copolymers and graft copolymers of ethylenically unsaturated perfluoroalkyl monomers having at least 6 C atoms in the perfluorinated chain and ethylenically unsaturated monomers containing no perfluoroalkyl groups, which additionally contain certain ester compounds which cannot be used as comonomers, are outstandingly suitable for finishing textile materials, leather and the like. Excellent oleophobic and hydrophobic effects are obtained.

Claims

1. Aqueous dispersions of copolymers or graft copolymers of ethylenically unsaturated perfluoroalkyl monomers having at least 6 C atoms in the perfluorinated chain selected from the group consisting of compounds corresponding to the formula ##STR6## wherein R₁ denotes C₁ -C₄ -alkyl,

R₂ denotes hydrogen or methyl,

m denotes 1 to 4 and

n denotes 4 to 12 and

ethylenically unsaturated monomers containing no perfluoroalkyl groups, characterized in that the dispersions additionally contain ester compounds which contain at least 6 C atom linked linearly to one another and either contain 1,2-substituted vinylic groups or are free from vinylic groups selected from the group consisting of

a) synthetic or naturally occurring esters and/or partial esters of saturated, unsaturated and/or substituted fatty acids of chain length C₆ -C₂₂ with mono-, di-, tri- and polyols,

b) esters and/or partial esters of di-, tri- and tetracarboxylic acids with saturated or unsaturated fatty alcohols of chain length C₆ -C₂₂, and

c) polyesters based on polyhydric alcohols and polybasic carboxylic acids having molecular weights of about 1,000 to 8,000.

2. Aqueous dispersions according to claim 1, characterized in that the monomers containing no perfluoroalkyl groups correspond to the formulae ##STR7## wherein R₃ denotes hydrogen, methyl or fluorine and

R₄ represents a C₈ -C₂₂ -alkyl radical,

R₅ denotes C₁ - to C₇ -alkyl,

R₆ denotes C₁ - to C₇ -alkyl, ##STR8## R₇ denotes H, CH₃, F or Cl, and R₈ denotes Cl, F, OR₁, phenyl, ##STR9## or CN and R₉ denotes C₁ -C₄ -alkyl.

3. Aqueous dispersions according to claim 1 characterized in that the comonomers containing no perfluoroalkyl groups are vinyl esters or acrylic and methacrylic esters of C₁ -C₄ -alkanols and acrylic and methacrylic esters of C₁₂ -C₂₂ -alkanols.

4. Aqueous dispersions according to claim 1, characterized in that hydrophobic vinyl polymers and/or polycondensates are employed as the graft base.

5. Aqueous dispersions according to claim 1, characterized in that the content of non-copolymerized ester compounds having at least 6 C atoms additionally contained in the dispersions is 2 to 50% by weight, preferably 5 to 35% by weight, based on the monomers employed.