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CORNING INCORPORATED

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“Synthesis Of Oligomer For Optical Fiber Coating” in Patent Application Approval Process (USPTO 20190225732): Corning Incorporated

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08/14/2019 | 05:48pm EDT

2019 AUG 14 (NewsRx) -- By a News Reporter-Staff News Editor at Technology Business Daily -- A patent application by the inventors Chen, Yangbin (Saint Paul, MN); Yang, Bin (Painted Post, NY), filed on January 11, 2019, was made available online on July 25, 2019, according to news reporting originating from Washington, D.C., by NewsRx correspondents.

This patent application is assigned to Corning Incorporated (Corning, New York, United States).

The following quote was obtained by the news editors from the background information supplied by the inventors: “The transmittance of light through an optical fiber is highly dependent on the properties of the coatings applied to the fiber. The coatings typically include a primary coating and a secondary coating, where the secondary coating surrounds the primary coating and the primary coating contacts the glass waveguide (core+cladding) portion of the fiber. The secondary coating is a harder material (higher Young’s modulus) than the primary coating and is designed to protect the glass waveguide from damage caused by abrasion or external forces that arise during processing and handling of the fiber. The primary coating is a softer material (low Young’s modulus) and is designed to buffer or dissipates stresses that result from forces applied to the outer surface of the secondary coating. Dissipation of stresses within the primary layer attenuates the stress and minimizes the stress that reaches the glass waveguide. The primary coating is especially important in dissipating stresses that arise when the fiber is bent. The bending stresses transmitted to the glass waveguide on the fiber need to be minimized because bending stresses create local perturbations in the refractive index profile of the glass waveguide. The local refractive index perturbations lead to intensity losses for the light transmitted through the waveguide. By dissipating stresses, the primary coating minimizes bend-induced intensity losses.

“To minimize bending losses, it is desirable to develop primary coating materials with increasingly lower Young’s moduli. Primary coating materials with a Young’s modulus below 1 MPa are preferred. As the Young’s modulus of the primary coating is reduced, however, the primary coating is more susceptible to damage in the fiber manufacturing process or during fiber installation or deployment. Thermal and mechanical stresses that arise during the fiber coating process or during post-manufacture fiber handling and configuration processes (e.g. stripping, cabling and connecting operations) may lead to the formation of defects in the primary coating. The defect formation in the primary coating becomes more problematic as the Young’s modulus of the primary coating material decreases. There is a need for a primary coating material that has a low Young’s modulus and yet is resistant to stress-induced defect formation during fiber manufacture and handling.

“Primary coatings with low Young’s modulus and high tear strength have been described in U.S. Pat. No. 9,810,838, the disclosure of which is incorporated herein. The coatings are formed from a radiation-curable coating composition that includes monomers, oligomers, photoinitiator(s), and various additives. The modulus and other mechanical properties of primary coatings are strongly influenced by the oligomer. Current methods for making suitable oligomers, however, are slow and expensive. There is a need for new methods for synthesizing oligomers for optical fiber coating compositions.”

In addition to the background information obtained for this patent application, NewsRx journalists also obtained the inventors’ summary information for this patent application: “The present disclosure provides methods for making oligomers. The oligomers are suitable for use in coating compositions and provide control of mechanical properties of coatings made from the coating compositions. Coatings made from coating compositions that include the oligomers feature a Young’s modulus .ltoreq.1.0 MPa, a tensile strength .gtoreq.0.25 MPa, a tear strength .gtoreq.20 J/m.sup.2, and/or a T.sub.g.ltoreq.-35.degree. C.

“The oligomers include compounds with urethane linkages and are made through a reaction of a polyol and a precursor with mixed functionality. The precursor includes an isocyanate group and a curable functional group. In one aspect, the curable functional group is an acrylate group or a methacrylate group. In some aspects, the oligomer includes two or more urethane compounds and/or a supplemental compound having two or more functional groups.

“The present disclosure extends to:

“A method for making an oligomer, comprising:

“reacting a first polyol with a first precursor to form a first urethane compound, the first polyol including two or more OH groups and a repeating alkoxylene group, the first precursor including an isocyanate group and a curable functional group

“The present disclosure extends to:

“An oligomer formed from a reaction of a first polyol with a first precursor, the first polyol including two or more OH groups and a repeating alkoxylene group, the first precursor including an isocyanate group and a curable functional group.

“The present disclosure extends to:

“A coating composition comprising:

“an oligomer, the oligomer comprising a first urethane compound, the first urethane compound formed from a reaction of a first polyol with a first precursor, the first polyol including two or more OH groups and a repeating alkoxylene group, the first precursor including an isocyanate group and a curable functional group.

“Additional features and advantages will be set forth in the detailed description which follows, and in part will be readily apparent to those skilled in the art from the description or recognized by practicing the embodiments as described in the written description and claims hereof, as well as the appended drawings.

“It is to be understood that both the foregoing general description and the following detailed description are merely exemplary, and are intended to provide an overview or framework to understand the nature and character of the claims.

“The accompanying drawings are included to provide a further understanding, and are incorporated in and constitute a part of this specification. The drawings are illustrative of selected aspects of the present description, and together with the specification serve to explain principles and operation of methods, products, and compositions embraced by the present description. Features shown in the drawing are illustrative of selected embodiments of the present description and are not necessarily depicted in proper scale.”

The claims supplied by the inventors are:

“1. A method for making an oligomer, comprising: reacting a first polyol with a first precursor to form a first urethane compound, the first polyol including two or more OH groups and a repeating alkoxylene group, the first precursor including an isocyanate group and a curable functional group.

“2. The method of claim 1, wherein the first polyol has a formula H--O R.sub.1--O .sub.n--H and wherein R.sub.1 is an organic group and n is greater than 20.

“3. The method of claim 2, wherein R.sub.1 is a linear or branched alkylene group.

“4. The method of claim 1, wherein the first polyol has a molecular weight greater than 3000 g/mol and the first precursor has a molecular weight less than 500 g/mol.

“5. The method of claim 1, wherein the curable functional group is an acrylate or methacrylate group.

“6. The method of claim 1, wherein the first precursor comprises only one curable functional group.

“7. The method of claim 1, wherein the first precursor has a formula: O.dbd.C.dbd.N--R.sub.2-CFG and wherein CFG is the curable functional group, R.sub.2 is an organic group.

“8. The method of claim 7, wherein R.sub.2 comprises an alkylene linkage, an ether linkage, an ester linkage, an amine linkage or an amide linkage.

“9. The method of claim 1, wherein the first precursor has a molecular weight less than 500 g/mol and the first polyol has a molecular weight greater than 5000 g/mol.

“10. The method of claim 1, further comprising reacting the first precursor with a first diol to form a second urethane compound.

“11. The method of claim 1, further comprising reacting the first precursor with a first diol to form a second urethane compound, the first diol having a molecular weight less than 1000 g/mol and the first polyol having a molecular weight greater than 5000 g/mol.

“12. The method of claim 11, wherein a ratio of a molar amount of the first polyol to a molar amount of the first diol is greater than 10:1.

“13. The method of claim 11, further comprising reacting the first precursor with a second diol.

“14. The method of claim 1, further comprising reacting the first precursor with a second polyol, the second polyol including two or more OH groups and a repeating alkoxylene group, wherein a molecular weight of the first polyol is greater than a molecular weight of the second polyol by at least 2500 g/mol.

“15. The product of the method of claim 1.

“16. A coating composition comprising: an oligomer, the oligomer comprising a first urethane compound, the first urethane compound formed from a reaction of a first polyol with a first precursor, the first polyol including two or more OH groups and a repeating alkoxylene group, the first precursor including an isocyanate group and a curable functional group; and a photoinitiator.

“17. The coating composition of claim 16, wherein the first precursor has a formula O.dbd.C.dbd.N--R.sub.2-CFG and wherein CFG is the curable functional group, R.sub.2 is an organic group.

“18. The coating composition of claim 17, wherein the first polyol has a formula H--O R.sub.1--O .sub.nH and wherein CFG is an acrylate group, R.sub.1 is a linear or branched alkylene group, and n is greater than 20.

“19. The coating composition of claim 16, wherein the oligomer further comprises a second urethane compound, the second urethane compound formed by a reaction of the first precursor with a second polyol, the second polyol including two or more OH groups and a repeating alkoxylene group, the second polyol and the first polyol differing in molecular weight by at least 2000 g/mol.

“20. The coating composition of claim 16, wherein the oligomer further comprises a second urethane compound, the second urethane compound formed by a reaction of the first polyol with a second precursor, the second precursor including an isocyanate group and a curable functional group, the second precursor differing from the first precursor.”

URL and more information on this patent application, see: Chen, Yangbin; Yang, Bin. Synthesis Of Oligomer For Optical Fiber Coating. Filed January 11, 2019 and posted July 25, 2019. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220190225732%22.PGNR.&OS=DN/20190225732&RS=DN/20190225732

(Our reports deliver fact-based news of research and discoveries from around the world.)

Copyright © 2019 NewsRx LLC, Technology Business Daily, source Technology Newsletters

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