Heat conductive sheet and method for producing heat conductive sheet
AssigneeSekisui Chemical Co., Ltd.
InventorMasayuki Matsushima
Life of this patent
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Abstract
A heat conductive sheet having excellent adhesion between an acrylic resin layer and a supporting sheet is provided. The heat conductive sheet includes a heat conductive resin layer including a heat conductive acrylic resin composition; and a supporting resin layer (supporting sheet) containing a polyvinyl acetal resin and a styrene-vinyl isoprene block copolymer. Crosslinking of the supporting sheet with acrylic monomers of the acrylic heat conductive resin layer enables improvements in adhesion between the heat conductive resin layer and the supporting sheet.
Claims19
A supporting resin layer comprising:
- a polyvinyl acetal resin;
- and
- a styrene-vinyl isoprene block copolymer,
- wherein:
- the polyvinyl acetal resin and the styrene-vinyl isoprene block copolymer are mixed into a same single composition at a mass ratio from 9:1 to 7:3 and formed from the mixed same single composition into a single-layer sheet,
- a degree of acetalization of the polyvinyl acetal resin is 50 to 90 mol %,
- the polyvinyl acetal resin has a molecular weight from 5×104 to 20×104,
- the supporting resin layer has a surface tack of less than 10 kN/m2,
- the polyvinyl acetal resin has a glass transition temperature from 50 to 150° C.
A method for manufacturing a supporting sheet comprising:
- mixing a polyvinyl acetal resin and a styrene-vinyl isoprene block copolymer into a same single composition, and forming from the mixed same single composition a single-layer sheet, wherein:
- the polyvinyl acetal resin and the styrene-vinyl isoprene block copolymer are blended at a mass ratio from 9:1 to 7:3,
- a degree of acetalization of the polyvinyl acetal resin is 50 to 90 mol %,
- the polyvinyl acetal resin has a molecular weight from 5×104 to 20×104,
- the supporting sheet has a surface tack of less than 15 kN/m2, and
- the polyvinyl acetal resin has a glass transition temperature from 50 to 150° C.
A resin sheet comprising:
- a supporting resin layer containing a polyvinyl acetal resin and a styrene-vinyl isoprene block copolymer;
- and
- an acrylic resin layer formed on the supporting resin layer,
- wherein:
- the polyvinyl acetal resin and the styrene-vinyl isoprene block copolymer are mixed into a same single composition at a mass ratio from 9:1 to 7:3 and formed into a single-layer sheet,
- a degree of acetalization of the polyvinyl acetal resin is 50 to 90 mol %,
- the polyvinyl acetal resin has a molecular weight from 5×104 to 20×104,
- the supporting resin layer has a surface tack of less than 10 kN/m2, and
- the polyvinyl acetal resin has a glass transition temperature from 50 to 150° C.
Dependencies are inferred from the claim text.