US2007202331A1PendingUtilityA1

Ropes having improved cyclic bend over sheave performance

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Individually held — no corporate assignee on recordPriority: Feb 24, 2006Filed: Feb 21, 2007Published: Aug 30, 2007
Est. expiryFeb 24, 2026(expired)· nominal 20-yr term from priority
Inventors:Gregory Austin DavisBarbara M. CostainRalf Klein
D07B 2205/2014Y10T428/2933D07B 2201/2044D07B 1/025D07B 1/162D07B 2501/2061D07B 2201/2012
46
PatentIndex Score
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Claims

Abstract

An improved rope is formed from high tenacity fibers, preferably a blend of high tenacity polyethylene fibers with aramid fibers and/or liquid crystal copolyester fibers. The fibers and/or the rope are coated with a composition comprising an amino functional silicone resin and a neutralized low molecular weight polyethylene. The ropes are useful in marine applications, such as in deep sea lifting, and have improved cyclic bend over sheave fatigue resistance.

Claims

exact text as granted — not AI-modified
1 . A rope having improved cyclic bend over sheave (CBOS) fatigue resistance, said rope comprising high tenacity fibers, said rope and/or said fibers being coated with a composition comprising an amino functional silicone resin and a neutralized low molecular weight polyethylene.  
   
   
       2 . The rope of  claim 1  wherein said high tenacity fibers are selected from the group consisting of high molecular weight polyolefins, aramid, polyvinyl alcohol, polyacrylonitrile, polybenzazole, polyamide, polyester, liquid crystal polyesters, glass, carbon, basalt, mineral fibers and rigid rod fibers, and blends thereof.  
   
   
       3 . The rope of  claim 1  wherein said high tenacity fibers are selected from the group consisting of high molecular weight polyethylene fibers, aramid fibers, liquid crystal copolyester fibers, and blends thereof.  
   
   
       4 . The rope of  claim 1  wherein said high tenacity fibers comprise a blend of high tenacity polyethylene fibers and other high tenacity fibers that are not polyolefin fibers, said other fibers being aramid fibers and/or liquid crystal copolyester fibers.  
   
   
       5 . The rope of  claim 4  wherein said high tenacity polyethylene fibers are present in an amount ranging from about 40 to about 60 weight percent, and said other fibers are present in an amount ranging from about 60 to about 40 weight percent, based on the total weight of said high tenacity fibers in said rope.  
   
   
       6 . The rope of  claim 4  wherein said high tenacity fibers comprise a blend of high tenacity polyethylene fibers and aramid fibers.  
   
   
       7 . The rope of  claim 4  wherein said high tenacity fibers comprise a blend of high tenacity polyethylene fibers and liquid crystal copolyester fibers.  
   
   
       8 . The rope of  claim 4  wherein said composition is present on said rope in an amount of at least about 5 weight percent based on the weight of said rope.  
   
   
       9 . The rope of  claim 4  wherein said low molecular weight polyethylene is the major component of said composition.  
   
   
       10 . The rope of  claim 4  wherein said low molecular weight polyethylene is present in an amount of from about 55 percent to about 85 percent by weight based on the total weight of said composition.  
   
   
       11 . The rope of  claim 10  wherein said low molecular weight polyethylene is fully neutralized.  
   
   
       12 . The rope of  claim 4  further comprising fluoropolymer fibers.  
   
   
       13 . The rope of  claim 4  wherein said rope is a braided rope.  
   
   
       14 . The rope of  claim 1  wherein said high tenacity fibers have a tenacity of at least about 16 g/d.  
   
   
       15 . The rope of  claim 1  wherein said high tenacity fibers consist essentially of aramid fibers.  
   
   
       16 . A rope having improved CBOS fatigue resistance, the rope comprising a blend of high tenacity polyolefin fibers with other high tenacity fibers that are not polyolefin fibers, said rope and/or said fibers being coated with a composition comprising an amino functional silicone resin and a neutralized low molecular weight polyethylene.  
   
   
       17 . The rope of  claim 16  wherein said other high tenacity fibers comprise aramid fibers and/or liquid crystal copolyester fibers.  
   
   
       18 . The rope of  claim 17  wherein said high tenacity polyethylene fibers are present in an amount ranging from about 40 to about 60 weight percent, and said other high tenacity fibers comprise aramid fibers which are present in an amount ranging from about 60 to about 40 weight percent, based on the total weight of said high tenacity fibers in said rope.  
   
   
       19 . The rope of  claim 18  wherein said low molecular weight polyethylene is present in an amount of from about 55 percent to about 85 percent by weight based on the total weight of said composition, and wherein said low molecular weight polyethylene is fully neutralized.  
   
   
       20 . A rope having improved CBOS fatigue resistance, the rope comprising a blend of high tenacity polyolefin fibers with other high tenacity fibers, said other high tenacity fibers comprising aramid fibers and/or liquid crystal copolyester fibers, said rope and/or said fibers being coated with a composition comprising an amino functional silicone resin and a neutralized low molecular weight polyethylene.  
   
   
       21 . The rope of  claim 20  wherein said low molecular weight polyethylene is present in an amount of from about 55 percent to about 85 percent by weight based on the total weight of said composition and wherein said low molecular weight polyethylene is fully neutralized.  
   
   
       22 . A method of improving the cyclic bend over sheave (CBOS) fatigue life of a rope, said method comprising forming said rope from high tenacity fibers, and coating said rope and/or said fibers forming said rope with a composition comprising an amino functional silicone resin and a neutralized low molecular weight polyethylene.  
   
   
       23 . The method of  claim 22  wherein said high tenacity fibers comprise a blend of high tenacity polyethylene fibers with other high tenacity fibers, said other high tenacity fibers comprising aramid fibers and/or liquid crystal copolyester fibers.  
   
   
       24 . The method of  claim 23  including coating said rope with said composition, wherein said low molecular weight polyethylene is present in an amount of from about 55 percent to about 85 percent by weight based on the total weight of said composition and wherein said low molecular weight polyethylene is fully neutralized.  
   
   
       25 . The method of  claim 24  wherein said composition has a solids content of at least about 25% by weight.  
   
   
       26 . The method of  claim 25  wherein said amino functional silicone resin is in the form of an emulsion having a pH of from about 9 to about 11.  
   
   
       27 . The method of  claim 23  including coating said fibers with said composition, wherein said low molecular weight polyethylene is present in an amount of from about 55 percent to about 85 percent by weight based on the total weight of said composition and wherein said low molecular weight polyethylene is fully neutralized.  
   
   
       28 . In a method of lifting and placing heavy objects from and onto a seabed using a synthetic fiber rope, the improvement comprising utilizing as said rope a rope comprising high tenacity fibers, said rope and/or said fibers being coated with a composition comprising an amino functional silicone resin and a neutralized low molecular weight polyethylene.  
   
   
       29 . The method of  claim 28  wherein said rope comprises a blend of high tenacity polyethylene fibers and aramid fibers.  
   
   
       30 . The method of  claim 28  wherein said rope comprises a blend of high tenacity polyethylene fibers and liquid crystal copolyester fibers.

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