Thermally conductive adhesives and articles, and methods of making same
Assignee3M Innovative Properties Company
InventorsLi Yao, Richard Yufeng Liu
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Abstract
A thermally conductive adhesive is provided. The thermally conductive adhesive includes a polyolefin block-containing copolymer, a tackifier, and a thermally conductive filler. The thermally conductive adhesive is a crosslinked pressure sensitive adhesive, plus exhibits a high elongation at break. Additionally provided are thermally conductive articles, including a thermally conductive adhesive on a substrate and a thermally conductive pad. A method of making a thermally conductive adhesive is also provided, including exposing a composition to radiation to crosslink the composition.
Claims15
A thermally conductive adhesive comprising:
- a. 10 to 50 wt. % of a polyolefin block-containing copolymer;
- b. 10 to 50 wt. % of a tackifier;
- and
- c. 20 to 70 wt. % of a thermally conductive filler;
- wherein the thermally conductive adhesive is a crosslinked pressure sensitive adhesive and wherein the thermally conductive adhesive exhibits an elongation at break of 200% or greater.
A thermally conductive pad comprising:
- a. 10 to 50 wt. % of a polyolefin block-containing copolymer;
- b. 10 to 50 wt. % of a tackifier;
- and
- c. 20 to 70 wt. % of a thermally conductive filler;
- wherein the polyolefin block-containing copolymer is crosslinked;
- wherein the thermally conductive pad is not a pressure sensitive adhesive;
- and wherein the thermally conductive pad exhibits an elongation at break of 200% or greater.
A method of making a thermally conductive adhesive comprising:
- a. obtaining a composition comprising:
- i. 10 to 50 wt. % of a polyolefin block-containing copolymer;
- ii. 10 to 50 wt. % of a tackifier;
- iii. 20 to 70 wt. % of a thermally conductive filler;
- and
- iv. a photoinitiator;
- and
- b. exposing the composition to actinic radiation to crosslink the composition and form the thermally conductive adhesive, wherein the thermally conductive adhesive is a pressure sensitive adhesive and wherein the thermally conductive adhesive exhibits an elongation at break of 200% or greater.
Dependencies are inferred from the claim text.