Thixotropic grease composition and cable comprising same
First Claim
1. An article of manufacture comprising a filling material contained within a sheath, CHARACTERIZED IN THAT the filling material comprises(a) 77 to 95% b.w. of oil, or mixture of oils, selected from the class consisting of(i) ASTM type 103, 104A, or 104B paraffinic or naphthenic oil having a minimum specific gravity of about 0.86 and a pour point (ASTM D97) of less than -4°
- C.,(ii) polybutene oil of minimum specific gravity of about 0.83 and a pour point (ASTM D97) of less than 18°
C.,(iii) triglyceride-based vehetable oil,(iv) polypropylene oil,(v) chlorinated paraffin oil having a chlorine content between about 30 and 75% b.w. and a viscosity at 25°
C. of between 100 and 10,000 cps, and(vi) polymerized esters;
(b) 2 to 15% b.w. colloidal particles selected from the class consisting of hydrophobic fumed silica, precipitated silica, and clay, the colloidal particles having a BET surface area in the range from about 50 to about 400 m2 /g;
the filling material having a critical yield stress of less than 140 Pa at 20°
C.
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Accused Products
Abstract
A grease composition comprising oil, colloidal particle filler, and, optionally, a bleed inhibitor is disclosed. The grease typically has a critical yield stress below 140 Pa at 20° C., preferably below 70 or 35 Pa. The grease can advantageously be used as a cable filling material, especially for optical fiber cable. In the latter case it can result in cable having substantially no cabling loss. Preferred compositions comprise 77 to 95% b.w. of ASTM type 103, 104A, or 104B paraffinic or naphthenic oil, or polybutene oil; 2 to 15% b.w. of hydrophobic or hydrophilic fused silica; and optionally, up to 15% b.w. of styrene-rubber or styrene-rubber-styrene block copolymer, or semiliquid rubber.
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Citations
11 Claims
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1. An article of manufacture comprising a filling material contained within a sheath, CHARACTERIZED IN THAT the filling material comprises
(a) 77 to 95% b.w. of oil, or mixture of oils, selected from the class consisting of (i) ASTM type 103, 104A, or 104B paraffinic or naphthenic oil having a minimum specific gravity of about 0.86 and a pour point (ASTM D97) of less than -4° - C.,
(ii) polybutene oil of minimum specific gravity of about 0.83 and a pour point (ASTM D97) of less than 18°
C.,(iii) triglyceride-based vehetable oil, (iv) polypropylene oil, (v) chlorinated paraffin oil having a chlorine content between about 30 and 75% b.w. and a viscosity at 25°
C. of between 100 and 10,000 cps, and(vi) polymerized esters; (b) 2 to 15% b.w. colloidal particles selected from the class consisting of hydrophobic fumed silica, precipitated silica, and clay, the colloidal particles having a BET surface area in the range from about 50 to about 400 m2 /g; the filling material having a critical yield stress of less than 140 Pa at 20°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- C.,
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10. A cable comprising one or more optical fibers contained within a sheath leaving voids between the fibers and the sheath, and a filling material at least partially filling the voids, CHARACTERIZED IN THAT the filling material has a critical yield stress at 20°
- C. that is at most 35 Pa.
- View Dependent Claims (11)
Specification