Aqueous dispersions of graft polymers or copolymers, a process for their production and their use as hydrophobizing and oleophobizing agents for textiles

• US 4,636,545 A
• Filed: 02/19/1985
• Issued: 01/13/1987
• Est. Priority Date: 02/29/1984
• Status: Expired due to Fees

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: Nachtkamp, Klaus, Konig, Joachim, Suling, Carlhans
• Primary Examiner(s): IVY, C WARREN
• Application Number:
  US06/703,011
• Time in Patent Office: 693 Days
• Field of Search: 524/457
• US Class Current: 524/457
• CPC Class Codes: C08F 220/24 containing perhaloalkyl radicals
• CPC Class Codes: C08F 283/006 on to polymers provided for in C08G18/00 C08F283/004 takes precedence
• CPC Class Codes: C08G 18/0823 containing carboxylate salt groups or groups forming them
• CPC Class Codes: C08G 18/12 using two or more compounds having active hydrogen in the first polymerisation step
• CPC Class Codes: C08G 18/3231 Hydrazine or derivatives thereof
• CPC Class Codes: C08G 18/6659 with compounds of group C08G18/34
• CPC Class Codes: D06M 15/576 containing fluorine

Abstract

The present invention relates to aqueous dispersions of graft polymers or graft copolymers containing as the graft base an aqueous polyurethane dispersion optionally containing block polyisocyanates in dispersed form as crosslinker and, as the graft covering, a polymer or a copolymer of ethylenically unsaturated monomers, characterized in that the graft covering is a polymer of ethylenically unsaturated perfluoroalkyl monomers having a molecular weight above 367 or a copolymer of perfluoroalkyl monomers such as these with comonomers free from perfluoroalkyl groups.

The present invention also relates to a process for producing these dispersions and to their use as hydrophobizing and oleophobizing agents for textiles.

Claims

1. An oleophobizing and hydrophobizing agent for textiles, natural and synthetic fibers, carpets, papers and leather comprising an aqueous dispersion of graft polymers or graft copolymers prepared by polyermizing or copolymerizing an ethylenically unsaturated monomer or a mixture of ethylenically unsaturated monomers in the presence of an aqueous dispersion consisting essentially of a non-thermosetting polyurethane, wherein the ethylenically unsaturated monomer is an ethylenically unsaturated perfluoroalkyl monomer having a molecular weight above 367 and wherein said mixture of ethylenically unsaturated monomers is a mixture of said perfluoroalkyl monomer with at least one ethylenically unsaturated monomer which is free from perfluoroalkyl groups in a ratio by weight of perfluoroalkyl monomers to monomers free from perfluoroalkyl groups of at least 3:

2.

2. The oleophobizing and hydrophobizing agent of claim 1 wherein said agent has a solids content of between about 5 and 50% by weight, and the fluorine content of said solids is between about 6 and 50% by weight.

3. The oleophobizing and hydrophobizing agent of claim 1 wherein said agent has a solids content of between about 10 and 30% by weight and the fluorine content of said solids is between about 10 and 30% by weight.

6. A coated heat-resistant substrate wherein the coating comprises the oleophobizing and hydrophobizing agent of claim 1.

4. A process for producing an oleophobizing and hydrophobizing agent for textiles, natural and synthetic fibers, carpets, papers and leather comprising an aqueous dispersion of graft polymers or graft copolymers which comprises polymerizing or copolymerizing an ethylenically unsaturated monomer or a mixture of ethylenically unsaturated monomers in the presence of an aqueous dispersion consisting essentially of a non-thermosetting polyurethane, wherein said ethylenically unsaturated monomer is an ethylenically unsaturated perfluoroalkyl monomer having a molecular weight above 367 or wherein said mixture of ethylenically unsaturated monomers is a mixture of said perfluoroalkyl monomers with at least one ethylenically unsaturated monomer which is free from perfluoroalkyl groups in a ratio by weight of perfluoroalkyl monomers to monomers free from perfluoroalkyl groups of at least 3:

2.

5. The process of claim 4 wherein said ethylenically unsaturated monomer or said mixture of ethylenically unsaturated monomers are used in the form of a solution in a polar solvent or in the form of an aqueous emulsion.