Polytetrafluoroethylene aqueous dispersion composition, polytetrafluoroethylene resin film and polytetrafluoroethylene resin impregnated article

• US 8,105,694 B2
• Filed: 03/09/2006
• Issued: 01/31/2012
• Est. Priority Date: 03/10/2005
• Status: Active Grant

• Current Assignee: Daikin Industries Ltd
• Original Assignee: Daikin Industries Ltd
• Inventors: Nakatani, Yasukazu, Miura, Toshirou, Sawada, Yasuhiko, Torii, Hiroshi
• Primary Examiner(s): Chen, Vivian
• Application Number:
  US11/908,200
• Publication Number:
  US 20090035582A1
• Time in Patent Office: 2,154 Days
• Field of Search: None
• US Class Current: 428/422
• CPC Class Codes: C08J 2327/18 Homopolymers or copolymers of tetrafluoroethylene
• CPC Class Codes: C08J 3/05 from solid polymers
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 27/18 Homopolymers or copolymers or tetrafluoroethene
• CPC Class Codes: C08L 29/04 Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
• CPC Class Codes: C08L 29/10 Homopolymers or copolymers of unsaturated ethers C08L35/08 takes precedence
• CPC Class Codes: C08L 33/02 Homopolymers or copolymers of acids; Metal or ammonium salts thereof
• CPC Class Codes: C08L 39/06 Homopolymers or copolymers of N-vinyl-pyrrolidones
• CPC Class Codes: C08L 71/02 Polyalkylene oxides
• CPC Class Codes: C09D 127/18 Homopolymers or copolymers of tetrafluoroethene
• CPC Class Codes: H05K 1/034 containing halogen
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/254 Polymeric or resinous material
• CPC Class Codes: Y10T 428/3154 Of fluorinated addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31544 Addition polymer is perhalogenated
• CPC Class Codes: Y10T 442/20 Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
• CPC Class Codes: Y10T 442/2787 Coating or impregnation contains a vinyl polymer or copolymer
• CPC Class Codes: Y10T 442/2934 Coating or impregnation contains vinyl polymer or copolymer

Abstract

The invention provides a PTFE-containing aqueous dispersion composition which is excellent in mechanical stability and scarcely allows the formation of agglomerates due to fibrillation of the PTFE resin during transportation or processing thereof. This invention is a polytetrafluoroethylene-containing aqueous dispersion composition comprising a polytetrafluoroethylene resin (A), a hydrocarbon-derived nonionic compound (B) and a water-soluble high-molecular compound (C) having no oxygen atom in the main chain thereof.

Claims

1. A polytetrafluoroethylene-containing aqueous dispersion composition comprising:

a polytetrafluoroethylene resin (A), a hydrocarbon-derived nonionic compound (B) and a water-soluble high-molecular compound (C) having no oxygen atom in the main chain thereof,

said water-soluble high-molecular compound (C) is polyvinylpyrrolidone,

said polyvinylpyrrolidone has an average molecular weight of 100,000 to 20,000,000,

said composition has a viscosity at 25°

C. of not higher than 0.1 Pa·

s,

the content of the water-soluble high-molecular compound (C) is 0.00001 to 0.2 parts by mass per 100 parts by mass of said polytetrafluoroethylene resin (A).

2. The polytetrafluoroethylene-containing aqueous dispersion composition according to claim 1,

wherein the content of the polytetrafluoroethylene resin (A) is 30 to 70% by mass of the polytetrafluoroethylene-containing aqueous dispersion composition,

the content of the hydrocarbon-derived nonionic compound (B) is 2 to 12 parts by mass per 100 parts by mass of said polytetrafluoroethylene resin (A) and

the content of the water-soluble high-molecular compound (C) is 0.00001 to 0.2 part by mass per 100 parts by mass of said polytetrafluoroethylene resin (A).

3. The polytetrafluoroethylene-containing aqueous dispersion composition according to claim 1,

wherein the polytetrafluoroethylene resin (A) particles have an average particle diameter of 200 to 500 nm.

4. A polytetrafluoroethylene resin film obtained by applying the polytetrafluoroethylene-containing aqueous dispersion composition according to claim 1 to an article to be coated.

5. A polytetrafluoroethylene resin-impregnated article comprising

an article to be impregnated and a coat film obtained by impregnating said article to be impregnated with the polytetrafluoroethylene-containing aqueous dispersion composition according to claim 1.