Adhesive composition, adhesive layer, and adhesive sheet
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- NITTO DENKO CORP
- Filing Date
- 2021-07-21
- Publication Date
- 2026-06-12
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
【0024】 本発明の粘着剤組成物、粘着剤層は、ミリ波の高周波数帯において低い誘電率、誘電損失を示し、ミリ波の放射損失を低く抑えることができる。従って、本発明の粘着シートを用いて、ミリ波アンテナの構成部材を貼り合わせることにより、高いアンテナ利得を示すミリ波アンテナを効率的に製造することができる。
Smart Images
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Abstract
Claims
[Claim 1] The dielectric constant at a frequency of 28 GHz is 2.0 to 5.
0. The dielectric loss at a frequency of 28 GHz is 0.0001 to 0.
05. This includes a mixture of a methacrylate compound having a hydrocarbon group with 6 or more carbon atoms, and a (meth)acrylate compound having a crosslinkable functional group, a partially polymer thereof, or a copolymer thereof. The weight-average molecular weight of the copolymer is 300,000 to 5,000,000. The methacrylate compound having a hydrocarbon group with 6 or more carbon atoms satisfies at least one of the following conditions (i), (ii), and (iii): The (meth)acrylate compound having a crosslinkable functional group is a methacrylate compound containing a crosslinkable functional group having a hydroxyl group, and the content of the methacrylate compound containing a crosslinkable functional group having a hydroxyl group or a constituent unit derived from said compound in the mixture, partially polymerized thereof, or copolymer is 1.0 to 30.0% by mass. An adhesive composition comprising 0.1 to 0.3 parts by mass of an azo polymerization initiator per 100 parts by mass of the total constituent units of the mixture, partially polymerized product thereof, or copolymer. (i) A methacrylate compound having an aliphatic group having 10 or more carbon atoms, wherein the content of the methacrylate compound having an aliphatic group having 10 or more carbon atoms or a constituent unit derived from said compound in the mixture, partially polymer thereof or copolymer is 66% by mass or more. (ii) A methacrylate compound having an alicyclic group with 6 or more carbon atoms, wherein the content of the methacrylate compound having an alicyclic group with 6 or more carbon atoms or a constituent unit derived from said compound in the mixture, partially polymer thereof, or copolymer is 10.0 to 50.0% by mass. (iii) A methacrylate compound having an aromatic ring-containing group with 6 or more carbon atoms, wherein the content of the methacrylate compound having an aromatic ring-containing group with 6 or more carbon atoms or a constituent unit derived from said compound in the mixture, partially polymer thereof, or copolymer is 10.0 to 50.0% by mass. [Claim 2] The adhesive composition according to claim 1, wherein the dielectric constant at a frequency of 60 GHz is 2.0 to 5.
0. [Claim 3] The dielectric constant at a frequency of 60 GHz is 2.0 to 5.
0. The dielectric loss at a frequency of 60 GHz is 0.0001 to 0.
05. This includes a mixture of a methacrylate compound having a hydrocarbon group with 6 or more carbon atoms, and a (meth)acrylate compound having a crosslinkable functional group, a partially polymer thereof, or a copolymer thereof. The weight-average molecular weight of the copolymer is 300,000 to 5,000,000. The methacrylate compound having a hydrocarbon group with 6 or more carbon atoms satisfies at least one of the following conditions (i), (ii), and (iii): The (meth)acrylate compound having a crosslinkable functional group is a methacrylate compound containing a crosslinkable functional group having a hydroxyl group, and the content of the methacrylate compound containing a crosslinkable functional group having a hydroxyl group or a constituent unit derived from said compound in the mixture, partially polymerized thereof, or copolymer is 1.0 to 30.0% by mass. An adhesive composition comprising 0.1 to 0.3 parts by mass of an azo polymerization initiator per 100 parts by mass of the total constituent units of the mixture, partially polymerized product thereof, or copolymer. (i) A methacrylate compound having an aliphatic group having 10 or more carbon atoms, wherein the content of the methacrylate compound having an aliphatic group having 10 or more carbon atoms or a constituent unit derived from said compound in the mixture, partially polymer thereof or copolymer is 66% by mass or more. (ii) A methacrylate compound having an alicyclic group with 6 or more carbon atoms, wherein the content of the methacrylate compound having an alicyclic group with 6 or more carbon atoms or a constituent unit derived from said compound in the mixture, partially polymer thereof, or copolymer is 10.0 to 50.0% by mass. (iii) A methacrylate compound having an aromatic ring-containing group with 6 or more carbon atoms, wherein the content of the methacrylate compound having an aromatic ring-containing group with 6 or more carbon atoms or a constituent unit derived from said compound in the mixture, partially polymer thereof, or copolymer is 10.0 to 50.0% by mass. [Claim 4] The adhesive composition according to any one of claims 1 to 3, wherein in the above (ii) and (iii), the content of the methacrylate compound having an alicyclic group having 6 or more carbon atoms and / or the methacrylate compound having an aromatic ring group having 6 or more carbon atoms, or constituent units derived from said compound, in the mixture, a partially polymer thereof or copolymer is 25% by mass or more. [Claim 5] The adhesive composition according to any one of claims 1 to 4, wherein the content of the (meth)acrylate compound having the crosslinkable functional group or a constituent unit derived from said compound in the mixture, a partially polymer thereof, or a copolymer thereof is 1.0 to 20.0% by mass. [Claim 6] The adhesive composition according to any one of claims 1 to 5, wherein the hydrocarbon group has an alicyclic group or an aromatic group at its terminus. [Claim 7] An adhesive layer formed by the adhesive composition according to any one of claims 1 to 6. [Claim 8] An adhesive sheet having the adhesive layer described in claim 7. [Claim 9] A millimeter-wave antenna comprising at least an adhesive sheet and a substrate as described in claim 8, wherein the substrate has an antenna element on at least one side, and the adhesive sheet is attached to the side of the substrate that has the antenna element.