Method for manufacturing transfer film, laminate, optical waveguide, photosensitive composition, optical waveguide

Abstract

The present invention provides a transfer film that can form an optical waveguide that is alkali-developable and capable of achieving low light propagation loss. It also provides a laminate, a method for manufacturing the optical waveguide, a photosensitive composition, and the optical waveguide itself. [Solution] A transfer film comprising a temporary support and a photosensitive composition layer, The above photosensitive composition layer is A polymer having a repeating unit represented by formula (1), a radical polymerizable group, and a carboxyl group or a salt thereof, It contains a compound that reduces the amount of carboxyl groups, A transfer film in which the content of the repeating units represented by the above formula (1) is 20 mol% or more relative to the total repeating units in the polymer.

Claims

1. A transfer film comprising a temporary support and a photosensitive composition layer, The photosensitive composition layer is A polymer having a repeating unit represented by formula (1), a radical polymerizable group, and a carboxyl group or a salt thereof, It contains a compound that reduces the amount of carboxyl groups, A transfer film in which the content of the repeating units represented by formula (1) is 20 mol% or more relative to the total repeating units in the polymer. 【Chemistry 1】 R １ R represents a hydrogen atom or a cyano group. ２ R represents a hydrogen atom, a methyl group, or a cyanoethyl group. However, R １ When R represents a cyano group, ２ R represents a hydrogen atom. １ When R represents a hydrogen atom, ２ represents a hydrogen atom, a methyl group, or a cyanoethyl group.

2. The transfer film according to claim 1, wherein the repeating unit represented by formula (1) includes one or more selected from the group consisting of the repeating unit represented by formula (2) and the repeating unit represented by formula (3), and the total content of the repeating unit represented by formula (2) and the repeating unit represented by formula (3) is 20 mol% or more with respect to the total repeating units in the polymer. 【Chemistry 2】

3. The transfer film according to claim 1 or 2, wherein the acid value of the polymer is 1.3 to 3.0 mmol / g.

4. The transfer film according to claim 1 or 2, wherein the compound that reduces the amount of carboxyl groups is a compound that causes a decarboxylation reaction of carboxyl groups upon exposure.

5. The transfer film according to claim 4, wherein the compound that causes a decarboxylation reaction of a carboxyl group by exposure is one or more selected from the group consisting of quinoline compounds, isoquinoline compounds, and quinoxaline compounds.

6. The transfer film according to claim 5, wherein the quinoline compound, the isoquinoline compound, and the quinoxaline compound each have at least one radical polymerizable group.

7. The transfer film according to claim 6, wherein the radical polymerizable group is selected from the group consisting of a styryl group, an acryloyl group, and a methacryloyl group.

8. The transfer film according to claim 1 or 2, wherein the compound that reduces the amount of carboxyl groups is an isocyanate compound.

9. A laminate comprising a substrate, a resin layer, and a transfer film according to claim 1 or 2, wherein the photosensitive composition layer of the transfer film is arranged to face the resin layer.

10. The laminate according to claim 9, wherein the refractive index of the resin layer is lower than the refractive index of the cured layer of the photosensitive composition layer.

11. A method for manufacturing an optical waveguide, Step 1 of performing an exposure treatment on the photosensitive composition layer in the laminate according to claim 10, Step 2 involves performing an alkaline development treatment on the photosensitive composition layer that has been exposed to light to form a core, The process includes step 3, which involves forming a resin layer on the core portion that has a lower refractive index than the core portion so as to cover the core layer, thereby forming an optical waveguide having the core portion and the cladding portion. The process includes a step 4 of peeling off the temporary support before step 1, or between step 1 and step 2. A method for manufacturing an optical waveguide that satisfies at least one of the following requirements A and B. Requirement A: Reduce the amount of carboxyl groups in step 1. Requirement B: The process includes a step 5 in which a treatment is performed to reduce the amount of carboxyl groups, at least one of the group selected from the group consisting of the interval between step 1 and step 2, the interval between step 2 and step 3, and the interval after step 3.

12. The process includes step 5 between step 2 and step 3, or after step 3, The method for manufacturing an optical waveguide according to claim 11, wherein in the core portion subjected to the process of reducing the amount of carboxyl groups by step 5, the remaining percentage of carboxyl groups is 30 mol% or less.

13. A polymer having a repeating unit represented by formula (1), a radical polymerizable group, and a carboxyl group or a salt thereof, A photosensitive composition comprising a compound that reduces the amount of carboxyl groups, A photosensitive composition in which the content of the repeating unit represented by formula (1) is 20 mol% or more relative to the total repeating units in the polymer. 【Transformation 3】 R １ represents a hydrogen atom or a cyano group. R ２ represents a hydrogen atom, a methyl group, or a cyanoethyl group. However, when R １ represents a cyano group, R ２ represents a hydrogen atom. Also, when R １ represents a hydrogen atom, R ２ represents a hydrogen atom, a methyl group, or a cyanoethyl group.

14. The photosensitive composition according to claim 13, wherein the repeating unit represented by formula (1) comprises one or more selected from the group consisting of the repeating unit represented by formula (2) and the repeating unit represented by formula (3), and the total content of the repeating unit represented by formula (2) and the repeating unit represented by formula (3) is 20 mol% or more with respect to the total repeating units in the polymer. 【Chemistry 4】

15. The photosensitive composition according to claim 13 or 14, wherein the acid value of the polymer is 1.3 to 3.0 mmol / g.

16. The photosensitive composition according to claim 13 or 14, wherein the compound that reduces the amount of carboxyl groups is a compound that causes a decarboxylation reaction of carboxyl groups upon exposure.

17. The photosensitive composition according to claim 16, wherein the compound that causes a decarboxylation reaction of a carboxyl group by exposure is one or more selected from the group consisting of quinoline compounds, isoquinoline compounds, and quinoxaline compounds.

18. The photosensitive composition according to claim 17, wherein the quinoline compound, the isoquinoline compound, and the quinoxaline compound each have at least one radical polymerizable group.

19. The photosensitive composition according to claim 13 or 14, wherein the compound that reduces the amount of carboxyl groups is an isocyanate compound.

20. An optical waveguide having a core portion and a cladding portion having a lower refractive index than the core portion, which is arranged to cover the periphery of the core portion. An optical waveguide in which the core portion is a layer formed from the photosensitive composition described in claim 13 or 14.

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