Patent TW-201730226-A (TW)
Title: Method for manufacturing GI type optical waveguide with high heat resistance and low transmission loss in the region of long wavelength
Inventor: NAGASAWA TAKEHIRO
IPC: C08F230/08
Filed: 2016-10-21
Abstract: The present invention provides a method for manufacturing GI type optical waveguide of high heat resistance and low transmission loss in the region of long wavelength. The method for manufacturing GI type optical waveguide of the present invention has the following steps: the first step is to thrust the needle-shaped portion at the front end of the spewing portion into the un-hardened covering portion; the second step is to spew the un-hardened material from the aforementioned needle-shaped portion while move the aforementioned needle-shaped portion in the aforementioned un-hardened covering portion to form an unhardened core portion wherein the periphery of the unhardened core portion is coated with the aforementioned un-hardened covering portion; the third step is to remove the aforementioned needle-shaped portion from the aforementioned un-hardened covering portion; and the fourth step is to harden the aforementioned un-hardened covering portion and the aforementioned unhardened core portion. The aforementioned un-hardened covering portion is made of a composition containing (a) 100 mass parts of an reactive silicone compound and (b) 1~200 mass parts of a dimethyl acrylate compound as shown by the formula (3). The (a) reactive silicone compound is a polycondensate of the diaryl silicate compound A as shown by the formula [1] and the alkoxy silicone compound B as shown by the formula [2] or a polycondensate of the diaryl silicate compound A and the alkoxy silicone compound B and other polycondensation compounds. The aforementioned unhardened core portion is made of a composition containing (x) 100 mass parts of a reactive silicone compound and (y) 0.1~100 mass parts of an aromatic vinyl compound as shown by the formula [4]. The (x) reactive silicone compound is a polycondensate of the diaryl silicate compound A as shown by the formula [1] and the alkoxy silicone compound B as shown by the formula [2] or a polycondensate of the diaryl silicate compound A and the alkoxy silicone compound B and other polycondensation compounds, (in the formula, Ar 1 and Ar 2 represent substitutable phenyl, naphthyl, or diphenyl groups.) [Formula 2] Ar 3 -Si(OR 1 )aR 2 3-a[2](in the formula, Ar 3 represents a phenyl, naphthyl, or diphenyl group containing at least one group having a polymerizable double bond, R1 represents a methyl or ethyl group, R2 represents a methyl, ethyl, or vinyl benzyl group, a represents 2 or 3), (in the formula, R3 and R4 represent a hydrogen atom or a methyl group, R5 represents a hydrogen atom, a methyl or ethyl group, L1 and L2 represent an alkylene group, m and n represent 0 or positive integers satisfying m+n is 0 ~ 20), (in the formula, R6 represents a hydrogen atom or a methyl group, L3 represents a single bond, a hydrogen atom, an oxygen atom, q-valence aliphatic hydrocarbon residual group with carbon atom number of 1 ~ 20 and capable of being substituted by phenyl groups, or q-valence aliphatic hydrocarbon residual group with carbon atom number of 1 ~ 20 and capable of containing ether bonds, Ar4 represents a p+1-valence aromatic hydrocarbon residual group, p independently represents 1 or 2, q represents an integer of 1 ~ 3 (when L3 represents a hydrogen atom, q represents 1, and when L3 represents a single bond or an oxygen atom, q represents 2.)).