Thermally conductive sheet and manufacturing method therefor

A method for producing a heat conductive sheet, comprising the steps of:

• mixing at least a curable polymer composition and an anisotropic filler to obtain a mixed composition;
• curing the mixed composition by heating to obtain a cured product;
• slicing the cured product into a sheet;
• applying a pressure-sensitive adhesive to a surface of the cured product;
• and
• allowing the applied pressure-sensitive adhesive to permeate into the cured product.

A heat conductive sheet comprising a polymer matrix and an anisotropic filler oriented in a thickness direction,

• the heat conductive sheet having a thickness of less than 0.2 mm, and
• the following (1) and (2) being satisfied:
• C
• S
• ⁢
• 1
• >
• C
• S
• ⁢
• 2
• (
• 1
• )
• P
• S
• ⁢
• 1
• <
• P
• S
• ⁢
• 2
• (
• 2
• )
• wherein, in a cross-section S1, which is parallel to a surface of the heat conductive sheet, at a center portion in the thickness direction, CS1 represents a proportion of an area occupied by the anisotropic filler, and PS1 represents a proportion of an area occupied by a resin comprising the polymer matrix;
• and
• in a cross-section S2, which is parallel to a surface of the heat conductive sheet, located at a depth of 25 μm from the surface, CS2 represents a proportion of an area occupied by the anisotropic filler, and PS2 represents a proportion of an area occupied by a resin comprising the polymer matrix.