US 2017/0362473 A1Published application

Thermally conductive adhesive

AssigneeHenkel AG & Co. KGaA

InventorsRuediger BUTTERBACH, Patrick MARKIEFKA, Carsten SCHUBERT, Judith SIEPENKOTHEN, Siegfried KOPANNIA

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Abstract

The present invention relates to hotmelt adhesives with improved thermal conductivity, uses thereof and methods for the manufacture of articles with improved thermal conductivity using said adhesive compositions. The adhesive compositions of the invention comprise at least one (co)polymer binder and combination of different fillers, as defined herein.

Claims11

Dependent claims

An adhesive composition comprising:

(1) a first filler selected from the group consisting of expanded clay, expanded graphite, expanded mica, expanded shale, expanded vermiculite, pumice, scoria, ceramic microspheres, diatomaceous earth, perlite, fumed silica and combinations thereof;
(2) a second filler, which is different from the first filler, selected from the group consisting of thermally conductive metal oxides, tin oxide, indium oxide, antimony oxide, aluminum oxide, titanium oxide, iron oxide, magnesium oxide, zinc oxide, oxides of rare earth metals, alkaline and alkaline earth metal sulfates, chalk, alkaline silicate, silica, ball-shaped iron, ball-shaped copper, ball-shaped aluminum, ball-shaped zinc, ball-shaped gold, ball-shaped silver, and ball-shaped tin, alkaline and alkaline earth metal halides, alkaline and alkaline earth metal phosphates, and combinations thereof;
wherein the second filler has an aspect ratio of 1 to 10;
(3) a third filler, which is different from the first, selected from the group consisting of flaky iron, flaky copper, flaky aluminum, flaky zinc, flaky gold, flaky silver, and flaky tin;
aluminum nitrides, silicon nitrides, boron nitrides, carbon black, flaky silicates, flaky wollastonite, alkaline and alkaline earth metal carbonates, aluminum hydroxide, magnesium hydroxide, alkaline borates, and combinations thereof;
wherein the third filler is different from (1) and has an aspect ratio of more than 10;
(4) at least one (co)polymer, selected from the group consisting of thermoplastic polyamides, alpha-olefins, poly(meth)acrylates, thermoplastic polyurethane, polyesters, ethylene copolymers, ethylene vinyl copolymers, styrenic block copolymers, PLA, copolyamides, silicones, epoxies, polyols or combinations thereof;
(5) optionally a tackifier;
and
(6) optionally an additive, selected from the group consisting of extender oils, plasticizers, dyes, adhesion promoters, waxes, antioxidants, surfactants, stabilizers, rheology modifiers, cross-linking agents, and combinations thereof.

7 more elements

Dependencies are inferred from the claim text.

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Abstract

An adhesive composition comprising:

(1) a first filler selected from the group consisting of expanded clay, expanded graphite, expanded mica, expanded shale, expanded vermiculite, pumice, scoria, ceramic microspheres, diatomaceous earth, perlite, fumed silica and combinations thereof;
(2) a second filler, which is different from the first filler, selected from the group consisting of thermally conductive metal oxides, tin oxide, indium oxide, antimony oxide, aluminum oxide, titanium oxide, iron oxide, magnesium oxide, zinc oxide, oxides of rare earth metals, alkaline and alkaline earth metal sulfates, chalk, alkaline silicate, silica, ball-shaped iron, ball-shaped copper, ball-shaped aluminum, ball-shaped zinc, ball-shaped gold, ball-shaped silver, and ball-shaped tin, alkaline and alkaline earth metal halides, alkaline and alkaline earth metal phosphates, and combinations thereof;
wherein the second filler has an aspect ratio of 1 to 10;
(3) a third filler, which is different from the first, selected from the group consisting of flaky iron, flaky copper, flaky aluminum, flaky zinc, flaky gold, flaky silver, and flaky tin;
aluminum nitrides, silicon nitrides, boron nitrides, carbon black, flaky silicates, flaky wollastonite, alkaline and alkaline earth metal carbonates, aluminum hydroxide, magnesium hydroxide, alkaline borates, and combinations thereof;
wherein the third filler is different from (1) and has an aspect ratio of more than 10;
(4) at least one (co)polymer, selected from the group consisting of thermoplastic polyamides, alpha-olefins, poly(meth)acrylates, thermoplastic polyurethane, polyesters, ethylene copolymers, ethylene vinyl copolymers, styrenic block copolymers, PLA, copolyamides, silicones, epoxies, polyols or combinations thereof;
(5) optionally a tackifier;
and
(6) optionally an additive, selected from the group consisting of extender oils, plasticizers, dyes, adhesion promoters, waxes, antioxidants, surfactants, stabilizers, rheology modifiers, cross-linking agents, and combinations thereof.

7 more elements