Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Reexamination Certificate
1999-08-19
2001-01-09
Berman, Susan W. (Department: 1711)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
C385S123000, C522S084000, C522S080000, C522S099000, C522S148000, C524S858000, C524S859000, C528S026000, C528S032000, C528S038000
Reexamination Certificate
active
06171698
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to protective coating compositions for glass optical fibers and glass optical fibers having coatings formed from such coating compositions. More particularly, the present invention relates to radiation curable, primary protective liquid coating composition for glass optical fibers formulated to have good adhesion and strength properties and glass optical fibers coated thereby.
2. Description of the Related Art
For many years now, optical fibers made from drawn glass have been used as a reliable transmission medium in telecommunications cables. Glass optical fibers are widely used because they have the ability to carry large amounts of information over long distances. Glass fibers are inherently strong because the glass forming the fiber has an intrinsic strength on order of 3×10
9
N/m
2
. See, “Optical Fibers for Transmission”, J. E. Midwinter, 1979, John Wiley and sons. The retention of such strength is largely dependent upon the application environment surrounding the optical fiber. For example, if the optical fiber is subjected to an abrasive environment, the abrasion, even with micron sized particles, produces microscopic flaws in the glass surface. These flaws propagate through the glass and eventually cause a fracture of the glass fiber. Glass optical fibers can also lose strength from contact with moisture and ions in solution. It is well known that hydrolysis of the surface bonds in silica glass occurs rapidly in the presence of water containing sodium ions. The hydrolysis of the surface bonds causes significant strength deterioration.
To protect the integrity and strength of glass optical fibers from environmentally caused degradation, one or more protective polymeric coatings have been applied to the outer surface, such as the cladding, of such optical fibers, shortly after the optical fibers have been drawn from a glass preform. One purpose of the coatings is to protect the surface of the optical fiber from mechanical scratches and abrasions typically caused by subsequent handling and use. Another purpose of the coatings is to protect the glass from exposure to moisture and ions in solution. The coating or coatings may also have some influence over the fiber's optical characteristics because the coatings are physically responsive to external mechanical forces and temperature.
The coating compositions applied to the optical fiber are typically liquid, radiation curable compositions. Typically, the coating compositions are cured on the optical fiber by exposing the coating composition to ultraviolet radiation, electron beam radiation or ionizing radiation for a predetermined period of time deemed suitable for effective curing.
It is important that the cured coating adhere well to the glass cladding, otherwise the cured coating will have a tendency to delaminate from the optical fiber. Delamination of the coating from the optical fiber is undesirable because the protective function of the coating is lost. Those skilled in the art will appreciate that adherence properties of a coating are typically determined by measuring the force required to peel a coating from a test surface, such as a glass plate, to which it has been applied.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a relatively inexpensive radiation curable liquid coating composition for application to a glass optical fiber which has good adhesive properties to the glass of the optical fiber and good mechanical properties.
It is another object of the present invention to provide a glass optical fiber having a radiation cured primary coating covering a least a portion of its surface, the primary coating having good adhesive properties to the surface of the glass optical fiber in which it covers and having suitable mechanical properties for protecting the optical fiber.
These objects are accomplished, at least in part, by providing a radiation curable liquid coating composition for forming a primary coating on a glass optical fiber, the composition comprising: a base radiation curable liquid composition capable of forming a polymeric coating, and a hydrolyzed coupling agent mixture of N-beta(aminoethyl)-gamma-aminopropylmethyldimethoxysilane, N-beta(aminoethyl)-gamma-aminopropyltrimethoxysilane, isocyanatopropyltriethoxysilane, and gamma-(trimethoxylsilyl)propylacrylate.
These objects are also accomplished, at least in part, by providing a glass optical fiber having at least a portion of its surface coated with a radiation cured coating formed by applying a radiation curable coating composition comprising a base radiation curable liquid composition capable of forming a polymeric coating, and a hydrolyzed coupling agent mixture, and exposing the radiation curable coating composition to radiation of a suitable wavelength, intensity and period to cause the coating composition to cure. The hydrolyzed coupling agent mixture is formed by a mixing N-beta(aminoethyl)-gamma-aminopropylmethyldimethoxysilane, N-beta(aminoethyl)-gamma-aminopropyltrimethoxysilane, isocyanatopropyltriethoxysilane, and gamma-(trimethoxylsilyl)propylacrylate and subjecting the coupling agent mixture to a hydrolyzation treatment process prior to its addition to the base radiation curable liquid composition.
Other objects and advantages will become apparent to those skilled in the art upon reading the detailed description in view of the drawing set forth below.
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Khudyakov Igor V.
Overton Bob J.
Purvis Michael
Alcatel
Berman Susan W.
Ware Fressola Van der Sluys & Adolphson LLP
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