Composition for providing oil and water repellency

• US 5,258,458 A
• Filed: 02/28/1991
• Issued: 11/02/1993
• Est. Priority Date: 02/28/1991
• Status: Expired due to Term

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Allewaert, Kathy, Bohez, Inge, Elst, Pierre V.
• Primary Examiner(s): Marquis, Melvyn I.
• Assistant Examiner(s): AYLWARD, DAVID E
• Application Number:
  US07/662,780
• Time in Patent Office: 978 Days
• Field of Search: 525/129, 525/124, 525/104, 526/245
• US Class Current: 525/104
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 33/16 Homopolymers or copolymers of esters containing halogen atoms
• CPC Class Codes: C08L 75/04 Polyurethanes
• CPC Class Codes: D06M 15/263 of unsaturated carboxylic acids; Salts or esters thereof
• CPC Class Codes: D06M 15/277 containing fluorine
• CPC Class Codes: D06M 15/576 containing fluorine
• CPC Class Codes: D06M 15/643 containing silicon in the main chain

Abstract

A composition for treating fibrous substrates such as textiles to provide oil and water repellency is provided. The composition comprises a) a terpolymer comprising randomly distributed i) units containing a fluoroaliphatic group, R_f, ii) fluorine-free hydrocarbon units, and iii) units containing silicone and b) a fluorine-containing polymer having isocyanate derived linking groups and blocked isocyanate moieties. Also provided is a method for providing oil and water repellency to a fibrous substrate.

Claims

1. A composition for treating fibrous substrates to provide oil and water repellency the composition comprising an aqueous emulsion of a) a terpolymer comprising randomly distributed i) units containing a fluoroaliphatic group, R_f, ii) fluorine-free organic units derived from ethylenic compounds capable of free-radical polymerization, and iii) units containing silicone and b) a fluorine-containing compounds derived from fluoroaliphatic radical-containing monoalcohols, di- or polyisocyanates and isocyanate blocking agents.

2. The composition of claim 1, wherein the ratio of component (a) to component (b) is from 20:

80 to 70;

30.

3. The composition of claim 2, wherein the ratio of component (a) to component (b) is from 40:

60 to 60;

40.

4. The composition of claim 1 wherein the terpolymer comprises about 50 to 90 weight percent of the copolymerizable segments containing an R_f group, about 10 to 50 weight percent of the copolymerizable organic segments free of fluorine and about 3 to 25 weight percent of the copolymerizable segments containing silicone when the silicone segment has a number average molecular weight in the range of about 1000 to 10,000 or about 0.5 to 10 weight percent when the silicone segment has a number average molecular weight in the range of about 10,000 to 20,000.

5. The composition of claim 1 wherein said terpolymer can be represented by the general formula I ##STR7## wherein A, A¹, and A² are randomly distributed and are each independently an alkylene group having 2 to 3 carbon atoms capable of copolymerization;

Q represents a divalent organic linking group;

R_f represents a fluoroaliphatic group which comprises a fully fluorinated terminal group;

R represents a fluorine free organic group;

R¹ represents a fluorine free organic group which comprises a siloxanyl group;

x is about 5 to 100;

y is about 5 to 200; and

z is about 1 to 75.

6. The composition of claim 1 wherein said terpolymer is formed by the polymerization of monomers represented by the formulas

7. The composition of claim 1 wherein component (b) can be represented by the formula ##STR8## wherein R_f represents a fluoroaliphatic group which comprises a fully fluorinated terminal portion;

Q represents a divalent organic linking group;

R² represents a fluorine free aliphatic radical which is the residue of a moiety capable of reacting with an isocyanate;

X represents a polyvalent isocyanate residue;

Y represents an organic moiety capable of blocking an isocyanato group; and

m+n equals the number of isocyanato functionalities contained in the isocyanate compound which is the precursor of X.

8. The composition of cliam 1 further comprising a hydrocarbon extender.