Method of treatment of a textile or non-woven substrate to render same water and oil repellent

• US 20050106326A1
• Filed: 11/27/2002
• Published: 05/19/2005
• Est. Priority Date: 01/21/2002
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Allewaert, Kathy E., Audenaert, Frans A
• Application Number:
  US10/500,525
• Publication Number:
  US 20050106326A1
• Time in Patent Office: Days
• US Class Current: 427/394
• CPC Class Codes: C08F 220/24 containing perhaloalkyl radicals
• CPC Class Codes: D06M 15/248 containing chlorine
• CPC Class Codes: D06M 15/277 containing fluorine
• CPC Class Codes: D06M 15/295 containing fluorine
• CPC Class Codes: D06M 2101/06 cellulosic
• CPC Class Codes: D06M 2101/32 Polyesters
• CPC Class Codes: D06M 2200/11 Oleophobic properties
• CPC Class Codes: D06M 2200/12 Hydrophobic properties

Abstract

The present invention relates to a method of treating a non-woven substrate or textile, comprising the step of applying to said non-woven substrate or textile a fluorochemical composition comprising a fluoropolymer that comprises:(a) between 10 and 97 mole % of units that can be derived from fluorinated monomer selected from the group consisting of monomers according to the general formula: R_f-X—OC(O)—C(R)═CH₂ wherein R_f represents a perfluorinated aliphatic group having 3 or 4 carbon atoms, X is an organic divalent linking group and R represent hydrogen or a lower alkyl group having 1 to 4 carbon atoms; (b) between 3 and 75 mole % of units derived from a chlorine containing comonomer selected from the group consisting of vinylidene chloride, vinyl chloride and mixtures thereof; and (c) optionally further units derived from monomers other than a fluorinated monomer and said chlorine containing comonomers; wherein the amount of units (a), (b) and (c) adding up to 100%, whereby said fluorochemical composition is applied in such amount that the weight of fluoropolymer on said non-woven substrate or textile is not more than 3% by weight based on the weight of said non-woven substrate or textile.

Claims

1. Method of treating a non-woven substrate or textile, comprising the step of applying to said non-woven substrate or textile a fluorochemical composition comprising a fluoropolymer that comprises:

(a) between 10 and 97 mole % of units that can be derived from fluorinated monomer selected from the group consisting of monomers according to the general formula;

R_f-X—

OC(O)—

C(R)═

CH₂

 

wherein R_f represents a perfluorinated aliphatic group having 3 or 4 carbon atoms, X is an organic divalent linking group, and R represents hydrogen or a lower alkyl group having 1 to 4 carbon atoms;

(b) between 3 and 75 mole % of units derived from a chlorine containing comonomer selected from the group consisting of vinylidene chloride, vinyl chloride and mixtures thereof; and

(c) optionally further units derived from monomers other than a fluorinated monomer and said chlorine containing comonomers;

wherein

 

the amount of units (a), (b) and (c) adding up to 100%,

whereby said fluorochemical composition is applied in such amount that the weight of fluoropolymer on said non-woven substrate or textile is not more than 3% by weight based on the weight of said non-woven substrate or textile.

2. Method according to claim 1 wherein the amount of units derived from said fluorinated monomer is between 25 and 97 mole %.

3. Method according to claim 1 wherein the fluorochemical composition is applied in such amount that the weight of fluoropolymer on said non-woven substrate or textile is not more than 1% by weight based on the weight of said non-woven substrate or textile.

4. Method according to claim 1 wherein said optional further units (c) comprise cure site units and said fluoropolymer comprises said cure site units in an amount of not more than 20 mole %.

5. Method according to claim 1 wherein said optional further units (c) comprise units derived from a hydrocarbon comonomer of the formula set forth below and said fluoropolymer comprises said units in an amount of up to 72 mole %:

R_h-L-Z

wherein R_h represents an aliphatic group having 4 to 30 carbon atoms, L represents an organic divalent linking group and Z represents an ethylenically unsaturated group.

6. Method according to claim 1 wherein said organic divalent linking group X is selected from the group consisting of alkylene, aralkylene, arylene, sulfonamido, carbonamido, carbonyloxy, urethanylene, ureylene and combinations thereof.

7. Method according to claim 1 wherein said fluorochemical composition further comprises an isocyanate extender, a blocked isocyanate extender, a melamine based extender or an anionic binder.

8. Method according to claim 1 wherein said non-woven substrate is a non-woven web of thermoplastic polymer fibers and/or cellulose fibers.

9. Method according to claim 8 wherein said non-woven substrate is a surgical drape or gown or a wrapping for surgical instruments.

10. Method according to claim 1 wherein said textile is a rain- or outerwear article.

11. Method according to claim 1 wherein said fluorinated monomer comprises at least one monomer according to said general formula (I) with R representing CH₃.

12. Non-woven substrate or textile having on a surface thereof an amount of the fluoropolymer as defined in claim 1 of not more than 3% by weight based on the weight of said non-woven substrate or textile.