Carbon nanotubes in carrier tape, cover tape and static shielding bags

Abstract

A carrier tape, cover tape or static shielding bag for transportation of electronic components is constructed of polymers and carbon nanotubes being between 0.01% and 3% by weight. The carbon nanotubes may have any number of walls and any desired size of diameter dimension which is less than approximately 100 nm. The carrier tape, cover tape or bags including the carbon nanotubes have a static dissipative range measured between 1×105 and 1×1012 Ω/sq and a light transmittance value of between 60% and 90%. The carrier tape, cover tape or bags including the carbon nanotubes reduce surface defects, high density entanglements and agglomerations. The static shielding bags including the carbon nanotubes may be formed as sheets which are manufactured into a desired size of bag.

I claim: 
     
         1 . A carrier tape comprising:
 a plurality of aligned pockets, said pockets being constructed and arranged for transportation of electronic components, said carrier tape being formed of materials, said materials comprising polymers, said polymers being between 0.99% and 99% by weight of said materials, and carbon nanotubes said carbon nanotubes being between 0.01% and 3% by weight of said materials.   
     
     
         2 . The carrier tape according to  claim 1 , wherein said carbon nanotubes are selected from the group consisting of single walled carbon nanotubes, double walled carbon nanotubes, and three or multi-walled carbon nanotubes and combinations thereof 
     
     
         3 . The carrier tape according to  claim 2 , wherein said double walled carbon nanotubes and three or multi-walled carbon nanotubes have a wall separation distance between adjacent walls of between 0.20 nm and 0.34 nm. 
     
     
         4 . The carrier tape according to  claim 2 , wherein said carbon nanotubes each have a diameter dimension of between  1  nm and  100  nm. 
     
     
         5 . The carrier tape according to  claim 2 , wherein said carbon nanotubes each have a surface area of between 600 m 2 /g to 1000 m 2 /g. 
     
     
         6 . The carrier tape according to  claim 2 , wherein said carbon nanotubes have an aspect ratio of 3000:1 to 6000:1. 
     
     
         7 . The carrier tape according to  claim 1 , wherein said carbon nanotubes are added to said polymers as raw carbon nanotube material prior to extrusion of said carrier tape. 
     
     
         8 . The carrier tape according to  claim 1 , wherein said polymers are selected from the group consisting of polycarbonate (PC), acrylonitrile butadiene styrene (ABS), polypropylene (PP), polystyrene (PS), Polyethylene Terephthalate (PET), High Density Polyethylene (HDPE), Low Density Polyethylene (LDPE), Linear Low Density Polyethylene (LLDPE), Styrene-Acrylonitrile (SAN), Polyethylene (PE), Polyester (PETE) and combinations thereof 
     
     
         9 . The carrier tape according to  claim 1 , wherein said carrier tape has a static dissipative range measured between 1×10 5  and 1×10 12  Ω/sq. 
     
     
         10 . The carrier tape according to  claim 2 , wherein said carrier tape has a light transmittance values of between 60% and 90%. 
     
     
         11 . The carrier tape according to  claim 10 , wherein said carrier tape has a haze value of between 60% and 70%. 
     
     
         12 . The carrier tape according to  claim 11 , wherein said carrier tape has a clarity value of between 25% and 45%. 
     
     
         13 . The carrier tape according to  claim 2 , wherein said carrier tape has surface defects measured at a value of 10% or less. 
     
     
         14 . The carrier tape according to  claim 2 , wherein said carrier tape has high density entanglements measured at a value of 5% or less. 
     
     
         15 . The carrier tape according to  claim 2 , wherein said carrier tape has agglomerations measured at a value of  5 % or less. 
     
     
         16 . The carrier tape according to  claim 2 , wherein said carrier tape has carbon material transfer (sluffing) measured at a value of 1% or less. 
     
     
         17 . The carrier tape according to  claim 1 , said carrier tape further comprising a cover tape, said cover tape comprising heat activated adhesive or pressure sensitive adhesive, said cover tape comprising at least one layer, said at least one layer being formed of said polymers and said carbon nanotubes. 
     
     
         18 . A cover tape comprising:
 an elongate tape portion, said elongate tape portion being formed of materials, said materials comprising polymers, said polymers being between 0.99% and 99% by weight of said materials, and carbon nanotubes said carbon nanotubes being between 0.01% and 3% by weight of said materials, wherein said elongate tape portion is constructed and arranged for engagement to a carrier tape through heat activation or pressure activation.   
     
     
         19 . An anti-static bag comprising:
 a plurality of layers, said plurality of layers being engaged to each other in a stacking relationship, said anti-static bag being constructed and arranged for transportation of electronic components, at least one of said plurality of layers being formed of materials, said materials comprising polymers, said polymers being between 0.99% and 99% by weight of said materials, and carbon nanotubes said carbon nanotubes being between 0.01% and 3% by weight of said materials.