Adhesive sheet
Assignee3M Innovative Properties Company
InventorHaruyuki Mikami
Life of this patent
Estimating the term…
Abstract
A pressure sensitive adhesive surface that does not adhere to the adherend and can be positioned by sliding it under low pressure, while it can exert a sufficient adhesive force under a pressure above a certain level. The adhesive sheet includes an adhesive layer with a fine structure on a surface thereof. The fine structure includes a plurality of cone or frustum structures, with the cones or frustums having two or more parts joined to each other via an interface. A first part is present on a top of the cones or frustums and is formed from a non-adhesive or a weak adhesive material, and a second part is present below the first part and is formed from a strong adhesive material.
Claims12
An adhesive sheet comprising an adhesive layer with a structure on a surface thereof, wherein
- the structure comprises a plurality of cone or frustum structures,
- the cones or frustums have two or more parts joined to each other via an interface,
- a first part present on a top of the cones or frustums is formed from a non-adhesive or a weak adhesive material, wherein the weak adhesive material is an adhesive having a storage modulus of elasticity of 3×105 Pa or greater as measured at a frequency of 1 Hz, and
- a second part present below the first part is formed from a strong adhesive material, wherein the strong adhesive material is an adhesive having a storage modulus of elasticity of less than 3×105 Pa as measured at a frequency of 1 Hz,
- wherein the first part and the second part of the cones or frustums are adjacent to each other, and a difference between a refractive index of the first part and a refractive index of the second part is within 1%.
Dependencies are inferred from the claim text.