IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0409834
(2009-03-24)
|
등록번호 |
US-8354461
(2013-01-15)
|
발명자
/ 주소 |
- Venkataraman, Sundar Kilnagar
- Young, Robert Thomas
|
출원인 / 주소 |
- E I du Pont de Nemours and Company
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
15 |
초록
▼
The present invention discloses a foamable composition. The foamable composition includes a partially-crystalline melt processible perfluoropolymer and a foam nucleating package. The foamable composition has a uniform foam cell size where the foam cell size of at least 90% of the foamed cells is 50
The present invention discloses a foamable composition. The foamable composition includes a partially-crystalline melt processible perfluoropolymer and a foam nucleating package. The foamable composition has a uniform foam cell size where the foam cell size of at least 90% of the foamed cells is 50 micrometers or less. The foam nucleating package ranges from 0.1 to 10 wt % of the combined weight of the perfluoropolymer and the foam nucleating package.
대표청구항
▼
1. A foamable composition for extruded foam insulation on a conductor, said insulation containing cells of uniform size concentrated towards the center of said insulation, whereby said insulation has a skin on its interior and exterior surfaces, said composition comprising: a) a partially-crystallin
1. A foamable composition for extruded foam insulation on a conductor, said insulation containing cells of uniform size concentrated towards the center of said insulation, whereby said insulation has a skin on its interior and exterior surfaces, said composition comprising: a) a partially-crystalline melt-processible fluorinated tetrafluoroethylene/hexafluoropropylene copolymer being substantially free of alkali metal ion, having less than about 20 unstable end groups per 106 carbon atoms, and having a melt flow rate of from about 25 to 35 g/10 min, and b) a foam nucleating package providing said uniform foam cell size wherein the foam cell size of 90% of the foamed cells is 50 micrometers or less, and said foam nucleating package ranges from 0.1-10 wt % of the combined weight of said tetrafluoroethylene/hexafluoropropylene copolymer and said foam nucleating package, the extrusion of said foam insulation exceeding 500 ft/min, and wherein said foam nucleating package comprises i) boron nitride, ii) calcium tetraborate, and iii) a foam nucleating agent of the formula [Z(CF2)x(CF2CFX)p(R′)y(CH2)zRO3]nM, wherein:Z is selected from CCl3, CCl2H, H, F, Cl or Br;each X, independently, is selected from H, F or Cl;R is sulfur or phosphorus;M is H or a metallic, ammonium, substituted ammonium or quaternary ammonium cation;x is an integer and is 0 to 10;p is an integer and is 0 to 6;y is 0 or 1;z is an integer and is 0 to 10; x+y+z+p is a positive integer or, if x+y+z+p is 0, Z is CCl3 or CCl2H;n is the valence of M; andR′ is selected from a C5-6 perfluorinated alicyclic ring diradical; a C1-16 perfluorinated aliphatic polyether diradical with repeat units selected from [CF2O], [CF2CF2O], and [CF2CF(CF3)O]; and a substituted or unsubstituted aromatic diradical, in which Z is H. 2. The composition according to claim 1, wherein said tetrafluoroethylene/hexafluoropropylene copolymer is made by polymerizing monomers comprising tetrafluoroethylene, hexafluoropropylene and perfluoro(alkyl vinyl ether). 3. The composition of claim 1 wherein the tetrafluoroethylene/hexafluoropropylene copolymer is melt fluorinated. 4. The composition according to claim 1, wherein said tetrafluoroethylene/hexafluoropropylene copolymer is polymerized and isolated without the use of alkali metal ion containing reagents. 5. The composition according to claim 1, comprising a tensile strength of at least 2000 psi (13.8 MPa) and an elongation of at least 200%. 6. The foamable composition according to claim 1 wherein the extrusion of said foam insulation is at a rate of at least 1000 ft/min. 7. The foamable composition according to claim 1 wherein said tetrafluoroethylene/hexafluoropropylene copolymer contains 3 to 20 wt % of said hexafluoropropylene. 8. The foamable composition according to claim 7 wherein the extrusion of said foam insulation is at a rate of at least 1000 ft/min. 9. The foamable composition according to claim 1 wherein said foam nucleating agent of said foam nucleating package comprises the barium salt of F(CF2)nCH2CH2SO3H, wherein n is selected from 6, 8, 10 and 12. 10. The foamable composition according to claim 1 wherein said foam nucleating package comprises 91.1±0.5 weight percent boron nitride, 2.5±0.2 weight percent calcium tetraborate, and 6.4±0.2 weight percent weight percent of the barium salt of F(CF2)nCH2CH2SO3H, wherein n is selected from 6, 8, 10 and 12.
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