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Multi-phase elastomeric thermally conductive materials

A technology of thermally conductive materials and thermally conductive fillers, applied in heat exchange materials, semiconductor devices, heat exchange equipment, etc., can solve the problems of high price, increased cost and impact of thermally conductive fillers

Active Publication Date: 2016-04-13
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this can be problematic because high volume fractions of inorganic fillers tend to adversely affect other TIM properties such as softness, flexibility, and surface conformity, while increasing costs due to the higher price of thermally conductive fillers

Method used

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  • Multi-phase elastomeric thermally conductive materials
  • Multi-phase elastomeric thermally conductive materials
  • Multi-phase elastomeric thermally conductive materials

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0123] Six samples (S1-S6) were prepared according to the formulations provided in Table 1 below. Samples S1-S6 were prepared by first blending the filler with the polar elastomer using a laboratory scale Haake mixer. The mixer was first set at 160°C and a rotor speed of 60 revolutions per minute ("rpm"). In each sample, the polar elastomer was first loaded into the mixer to melt completely, then the filler was added slowly and mixed for an additional 15 minutes at 60 rpm. Depending on filler type and loading level, the melt temperature can range from 170 to 175°C at the end of the mixing cycle. The resulting filler-containing masterbatch is pelletized for subsequent use. In the second step, the initial temperature was set at 180°C for S1, 160°C for S2, 190°C for S3, 150°C for S4, 180°C for S5 and 165°C for S6. The filler-containing masterbatch was then loaded into the mixer with the non-masterbatch resin and mixed at 60 rpm for 10 minutes.

[0124] After mixing, the resul...

example 2

[0136] Two additional comparative samples (CS7 and CS8) were prepared. CS7 is 37.5 vol% ELVAX with no fillers TM 250 with 62.5% ENGAGE by volume TM A blend of 8130. CS8 is 37.5 vol% ELVAX with no fillers TM 250 blend with 62.5 vol% HDPE. CS7 and CS8 were prepared by mixing the two polymer components in a Haake mixer at 180° C. and 100 rpm for 10 minutes. After mixing, the resulting blends were compression molded at 180°C and 10 MPa into 1 mm films, and then cooled to room temperature for tensile modulus analysis. The tensile modulus of CS7, CS8, S1 and S2 was analyzed. The results are provided in Table 3 below.

[0137] Table 3 - Tensile Modulus Comparison

[0138] sample

[0139] As shown in Table 3, when the elastomeric component is replaced with a thermoplastic component such as HDPE, the tensile modulus of the resulting composition increases greatly. Compositions with such high tensile moduli are generally unsuitable for use as thermal interface materials...

example 3

[0141] Three additional samples (S7-S9) were prepared according to the formulation shown in Table 4 below. These samples were prepared in the same manner as described for samples S1-S6 in Example 1 above.

[0142] Table 4 - Composition of samples S7-S9

[0143]

[0144] It should be noted that samples S7-S9 did not form a continuous phase of the filler-containing masterbatch in the final composition. As noted above, the filler-containing masterbatch preferably forms the continuous phase. In order to form a continuous phase, the relative viscosities and volume fractions of the two elastomeric phases provided in Table 5 below need to be considered.

[0145] Table 5 - Viscosities and volume fractions of samples S1-S9

[0146]

[0147]

[0148] In order to make the polar elastomer masterbatch phase continuous, two methods are used in this paper (1) increase the volume ratio of the polar elastomer masterbatch containing fillers to the non-polar elastomer, that is, mainly ...

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Abstract

Thermally conductive materials comprising a non-polar elastomer, a polar elastomer, and a thermally conductive filler. The polar elastomer and non-polar elastomer are sufficiently immiscible to form a polar elastomer phase and a non-polar elastomer phase. The thermally conductive filler is concentrated in an amount of at least 60 volume percent of the total filler amount in either the non-polar elastomer phase or the polar elastomer phase. The thermally conductive material has a tensile modulus less than 200 MPa. Such thermally conductive materials can be employed in a variety of articles of manufacture as thermal interface materials.

Description

technical field [0001] Various embodiments of the present invention relate to thermally conductive materials comprising non-polar elastomers, polar elastomers, and thermally conductive fillers. Background technique [0002] As the need to dissipate heat from microelectronic devices increases, the contribution of thermal interface materials ("TIMs") to the overall performance of the device package becomes increasingly important. Two key demands on TIMs are higher thermal conductivity and lower interfacial thermal resistance. Thermally conductive (electrically insulating or conductive) fillers can be added to the TIM matrix (primary polymer) to increase its thermal conductivity. However, in order to obtain high thermal conductivity in TIMs, a high volume percentage of fillers is generally required to form a continuous filler network. However, this can be problematic because high volume fractions of inorganic fillers tend to adversely affect other TIM properties such as softn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L21/00
CPCH01L2924/0002C08K3/22C08K3/28C08L23/0815C08L23/0853C08L23/16C09K5/14F28F21/06H01L2924/00H01L23/3675H01L23/3737
Inventor Y·杨陈红宇M·埃斯吉尔B·I·乔杜里
Owner DOW GLOBAL TECH LLC