Thermally conductive resin and thermal interface material comprising the same

Abstract

A thermally conductive resin is provided. The thermally conductive resin has the formula ##STR00001##
In the formula, X.sub.1 is ##STR00002##
X.sub.2 is ##STR00003##
m is an integer ranging from 0 to 95, n is an integer ranging from 1 to 50, and o is an integer ranging from 1 to 80. A thermal interface material including the thermally conductive resin is also provided.

Claims

1. A thermally conductive resin, represented by formula (I): ##STR00015## wherein X.sub.1 is ##STR00016## X.sub.2 is ##STR00017## ##STR00018## m is an integer ranging from 5 to 30, n is an integer ranging from 5 to 15, and o is an integer ranging from 40 to 80, wherein m:n:o=5-30:5-15:40-80.

2. A thermal interface material comprising a thermally conductive resin as claimed in claim 1.

3. The thermal interface material as claimed in claim 2, further comprising thermally conductive powder mixed in the thermal interface material.

4. The thermal interface material as claimed in claim 3, wherein the thermally conductive powder comprises ceramic powder.

5. The thermal interface material as claimed in claim 3, wherein the thermally conductive powder comprises boron nitride, silicon carbide, aluminum nitride or aluminum oxide.

6. The thermal interface material as claimed in claim 3, wherein the thermally conductive powder has a weight ratio less than or equal to 50% in the thermal interface material.

Description

DETAILED DESCRIPTION

(1) In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing.

(2) One embodiment of the disclosure provides a thermally conductive resin, represented by formula (I):

(3) ##STR00008##

(4) In formula (I), X.sub.1 may be

(5) ##STR00009##

(6) X.sub.2 may be

(7) ##STR00010##

(8) Additionally, in formula (I), m may be an integer ranging from about 0 to 95, n may be an integer ranging from about 1 to 50, and o may be an integer ranging from about 1 to 80.

(9) In some embodiments, in formula (I), m may be an integer ranging from about 0 to 75, n may be an integer ranging from about 5 to 50, and o may be an integer ranging from about 20 to 80.

(10) In some embodiments, in formula (I), m may be 0, n may be an integer ranging from about 20 to 50, and o may be an integer ranging from about 50 to 80.

(11) In some embodiments, in formula (I), m may be an integer ranging from about 5 to 75, n may be an integer ranging from about 5 to 30, and o may be an integer ranging from about 20 to 80.

(12) One embodiment of the disclosure provides a thermal interface material comprising a thermally conductive resin.

(13) In some embodiments, the thermally conductive resin may be represented by formula (I):

(14) ##STR00011##

(15) In formula (I), X.sub.1 may be

(16) ##STR00012##

(17) X.sub.2 may be

(18) ##STR00013## ##STR00014##

(19) Additionally, in formula (I), m may be an integer ranging from about 0 to 95, n may be an integer ranging from about 1 to 50, and o may be an integer ranging from about 1 to 80.

(20) In some embodiments, in formula (I), m may be an integer ranging from about 0 to 75, n may be an integer ranging from about 5 to 50, and o may be an integer ranging from about 20 to 80.

(21) In some embodiments, in formula (I), m may be 0, n may be an integer ranging from about 20 to 50, and o may be an integer ranging from about 50 to 80.

(22) In some embodiments, in formula (I), m may be an integer ranging from about 5 to 75, n may be an integer ranging from about 5 to 30, and o may be an integer ranging from about 20 to 80.

(23) In some embodiments, the thermal interface material further comprises thermally conductive powder mixed in the thermal interface material.

(24) In some embodiments, the disclosed thermally conductive powder may comprise ceramic powder, for example boron nitride, silicon carbide, aluminum nitride or aluminum oxide.

(25) In some embodiments, the thermally conductive powder has a weight ratio less than or equal to about 50% in the thermal interface material.

(26) In the disclosure, trimellitic anhydride (TMA) and the specific diisocyanate (for example MDI, TODI, NDI or a mixture thereof), dianhydride (for example PMDA, BTDA, ODPA, BPDA or a mixture thereof) and dicarboxylic acid (for example StDA) are adopted to proceed to polymerization reaction with the specific ratios to prepare a thermally conductive resin (PAI or PI) with characteristics of high thermal conductivity and high dielectric insulation.

EXAMPLES

Example 1

(27) The Preparation of the Thermally Conductive Resin (PAI resin) (1)

(28) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 71.98 g of trimellitic anhydride (TMA), 125.00 g of 4,4-methylenediphenyl diisocyanate (MDI), 7.35 g of 3,3,4,4-biphenyl tetracarboxylic dianhydride (BPDA) and 26.80 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 693.37 g of NMP solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PAI resin) of this example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 1. After the above steps were completed, the resin was kept in a sealed PE bottle.

Example 2

(29) The Preparation of the Thermally Conductive Resin (PAI resin) (2)

(30) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 36.24 g of trimellitic anhydride (TMA), 118.00 g of 4,4-methylenediphenyl diisocyanate (MDI), 41.62 g of 3,3,4,4-biphenyl tetracarboxylic dianhydride (BPDA) and 37.95 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 701.41 g of NMP solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PAI resin) of this example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 1. After the above steps were completed, the resin was kept in a sealed PE bottle.

Example 3

(31) The Preparation of the Thermally Conductive Resin (PI resin) (3)

(32) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 108.00 g of 4,4-methylenediphenyl diisocyanate (MDI), 63.49 g of 3,3,4,4-biphenyl tetracarboxylic dianhydride (BPDA) and 57.89 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 688.12 g of n-methylpyrrolidinone (NMP) solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PI resin) of this example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 1. After the above steps were completed, the resin was kept in a sealed PE bottle.

Example 4

(33) The Preparation of the Thermally Conductive Resin (PI resin) (4)

(34) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 110.00 g of 4,4-methylenediphenyl diisocyanate (MDI), 25.87 g of 3,3,4,4-biphenyl tetracarboxylic dianhydride (BPDA) and 94.33 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 690.59 g of n-methylpyrrolidinone (NMP) solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PI resin) of this example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 1. After the above steps were completed, the resin was kept in a sealed PE bottle.

Example 5

(35) The Preparation of the Thermally Conductive Resin (PI resin) (5)

(36) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 108.00 g of 4,4-methylenediphenyl diisocyanate (MDI), 31.74 g of 3,3,4,4-biphenyl tetracarboxylic dianhydride (BPDA), 33.47 g of 4,4-oxydiphthalic anhydride (ODPA) and 57.89 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 693.30 g of n-methylpyrrolidinone (NMP) solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PI resin) of this example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 1. After the above steps were completed, the resin was kept in a sealed PE bottle.

Example 6

(37) The Preparation of the Thermally Conductive Resin (PI resin) (6)

(38) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 53.50 g of 4,4-methylenediphenyl diisocyanate (MDI), 56.50 g of 3,3-dimethylbiphenyl-4,4-diisocyanate (TODI), 31.45 g of 3,3,4,4-biphenyl tetracarboxylic dianhydride (BPDA), 33.16 g of 4,4-oxydiphthalic anhydride (ODPA) and 57.35 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 695.87 g of n-methylpyrrolidinone (NMP) solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PI resin) of this example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 1. After the above steps were completed, the resin was kept in a sealed PE bottle.

(39) TABLE-US-00001 TABLE 1 Examples 1 2 3 4 5 6 Trimellitic + + anhydride (TMA) Diisocyanate MDI MDI MDI MDI MDI MDI TODI Dianhydride BPDA BPDA BPDA BPDA BPDA BPDA ODPA ODPA Dicarboxylic StDA StDA StDA StDA StDA StDA acid Thermal 0.35 0.41 0.42 0.45 0.41 0.36 conductivity value (W/mK) Molar ratio 75:5:20 40:30:30 0:50:50 0:20:80 0:50:50 0:50:50 (m:n:o)

Example 7

(40) The Preparation of the Thermally Conductive Resin (PI resin) (7)

(41) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 56.50 g of 4,4-methylenediphenyl diisocyanate (MDI), 47.45 g of 1, 5-naphthalene diisocyanate (NDI), 66.43 g of 3,3,4,4-biphenyl tetracarboxylic dianhydride (BPDA) and 60.57 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 692.84 g of n-methylpyrrolidinone (NMP) solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PI resin) of this example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 2. After the above steps were completed, the resin was kept in a sealed PE bottle.

Example 8

(42) The Preparation of the Thermally Conductive Resin (PAI resin) (8)

(43) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 35.62 g of trimellitic anhydride (TMA), 116.00 g of 4,4-methylenediphenyl diisocyanate (MDI), 20.46 g of 3,3,4,4-biphenyl tetracarboxylic dianhydride (BPDA), 22.40 g of 3,3,4,4-benzophenone tetracarboxylic dianhydride (BTDA) and 37.30 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 695.37 g of n-methylpyrrolidinone (NMP) solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PAI resin) of this example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 2. After the above steps were completed, the resin was kept in a sealed PE bottle.

Example 9

(44) The Preparation of the Thermally Conductive Resin (PAI resin) (9)

(45) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 36.54 g of trimellitic anhydride (TMA), 119.00 g of 4,4-methylenediphenyl diisocyanate (MDI), 20.99 g of 3,3,4,4-biphenyl tetracarboxylic dianhydride (BPDA), 15.56 g of pyromellitic dianhydride (PMDA) and 38.27 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 691.07 g of n-methylpyrrolidinone (NMP) solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PAI resin) of this example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 2. After the above steps were completed, the resin was kept in a sealed PE bottle.

Example 10

(46) The Preparation of the Thermally Conductive Resin (PAI resin) (10)

(47) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 35.62 g of trimellitic anhydride (TMA), 116.00 g of 4,4-methylenediphenyl diisocyanate (MDI), 20.46 g of 3,3,4,4-biphenyl tetracarboxylic dianhydride (BPDA), 21.57 g of 4,4-oxydiphthalic anhydride (ODPA) and 37.30 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 692.86 g of n-methylpyrrolidinone (NMP) solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PAI resin) of this example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 2. After the above steps were completed, the resin was kept in a sealed PE bottle.

Example 11

(48) The Preparation of the Thermally Conductive Resin (PAI resin) (11)

(49) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 26.03 g of trimellitic anhydride (TMA), 56.50 g of 4,4-methylenediphenyl diisocyanate (MDI), 59.67 g of 3,3-dimethylbiphenyl-4,4-diisocyanate (TODI), 39.86 g of 3,3,4,4-biphenyl tetracarboxylic dianhydride (BPDA) and 48.45 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 691.50 g of n-methylpyrrolidinone (NMP) solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PAI resin) of this example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 2. After the above steps were completed, the resin was kept in a sealed PE bottle.

Example 12

(50) The Preparation of the Thermally Conductive Resin (PAI resin) (12)

(51) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 27.87 g of trimellitic anhydride (TMA), 60.50 g of 4,4-methylenediphenyl diisocyanate (MDI), 50.81 g of 1,5-naphthalene diisocyanate (NDI), 14.23 g of 3,3,4,4-biphenyl tetracarboxylic dianhydride (BPDA) and 77.82 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 693.70 g of n-methylpyrrolidinone (NMP) solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PAI resin) of this example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 2. After the above steps were completed, the resin was kept in a sealed PE bottle.

Example 13

(52) The Preparation of the Thermally Conductive Resin (PAI resin) (13)

(53) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 27.06 g of trimellitic anhydride (TMA), 47.00 g of 4,4-methylenediphenyl diisocyanate (MDI), 29.61 g of 1,5-naphthalene diisocyanate (NDI), 37.23 g of 3,3-dimethylbiphenyl-4,4-diisocyanate (TODI), 13.81 g of 3,3,4,4-biphenyl tetracarboxylic dianhydride (BPDA) and 75.57 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 690.85 g of n-methylpyrrolidinone (NMP) solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PAI resin) of this example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 2. After the above steps were completed, the resin was kept in a sealed PE bottle.

(54) TABLE-US-00002 TABLE 2 Examples 7 8 9 10 11 12 13 Trimellitic + + + + + + anhydride (TMA) Diisocyanate MDI MDI MDI MDI MDI MDI MDI NDI TODI NDI NDI TODI Dianhydride BPDA BPDA BPDA BPDA BPDA BPDA BPDA BTDA PMDA ODPA Dicarboxylic StDA StDA StDA StDA StDA StDA StDA acid Thermal 0.42 0.32 0.36 0.31 0.37 0.45 0.41 conductivity value (W/mK) Molar ratio 0:50:50 40:30:30 40:30:30 40:30:30 30:30:40 30:10:60 30:10:60 (m:n:o)

Example 14

(55) The Preparation of the Thermally Conductive Resin (PAI resin) (14)

(56) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 27.42 g of trimellitic anhydride (TMA), 50.00 g of 1,5-naphthalene diisocyanate (NDI), 62.87 g of 3,3-dimethylbiphenyl-4,4-diisocyanate (TODI), 14.00 g of 3,3,4,4-biphenyl tetracarboxylic dianhydride (BPDA) and 76.58 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 692.59 g of n-methylpyrrolidinone (NMP) solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PAI resin) of this example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 3. After the above steps were completed, the resin was kept in a sealed PE bottle.

Example 15

(57) The Preparation of the Thermally Conductive Resin (PAI resin) (15)

(58) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 4.49 g of trimellitic anhydride (TMA), 58.50 g of 4,4-methylenediphenyl diisocyanate (MDI), 49.13 g of 1,5-naphthalene diisocyanate (NDI), 10.32 g of 3,3,4,4-biphenyl tetracarboxylic dianhydride (BPDA), 7.65 g of pyromellitic dianhydride (PMDA) and 100.34 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 691.28 g of n-methylpyrrolidinone (NMP) solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PAI resin) of this example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 3. After the above steps were completed, the resin was kept in a sealed PE bottle.

Example 16

(59) The Preparation of the Thermally Conductive Resin (PAI resin) (16)

(60) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 4.43 g of trimellitic anhydride (TMA), 48.50 g of 1,5-naphthalene diisocyanate (NDI), 60.98 g of 3,3-dimethylbiphenyl-4,4-diisocyanate (TODI), 10.18 g of 3,3,4,4-biphenyl tetracarboxylic dianhydride (BPDA), 7.55 g of pyromellitic dianhydride (PMDA) and 99.04 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 692.06 g of n-methylpyrrolidinone (NMP) solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PAI resin) of this example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 3. After the above steps were completed, the resin was kept in a sealed PE bottle.

(61) TABLE-US-00003 TABLE 3 Examples 14 15 16 Trimellitic anhydride + + + (TMA) Diisocyanate NDI MDI NDI TODI NDI TODI Dianhydride BPDA BPDA BPDA PMDA PMDA Dicarboxylic acid StDA StDA StDA Thermal conductivity value 0.42 0.46 0.44 (W/mK) Molar ratio (m:n:o) 30:10:60 5:15:80 5:15:80

Comparative Example 1

(62) The Preparation of Conventional Thermally Conductive Resin (PAI resin)

(63) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 100.57 g of trimellitic anhydride (TMA) and 131.00 g of 4,4-methylenediphenyl diisocyanate (MDI) were added to the reactor. 263.04 g of n-methylpyrrolidinone (NMP) solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PAI resin) of this comparative example was prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 4. After the above steps were completed, the resin was kept in a sealed PE bottle.

Comparative Example 2

(64) The Preparation of Conventional Thermally Conductive Resin (PAI resin)

(65) Under room temperature, a stirrer and heating mantle were shelved on a one-liter four-mouth reactor. 94.82 g of trimellitic anhydride (TMA), 130.00 g of 4,4-methylenediphenyl diisocyanate (MDI) and 6.97 g of 4,4-stilbenedicarboxylic acid (StDA) were added to the reactor. 695.35 g of n-methylpyrrolidinone (NMP) solvent was then added to the reactor to proceed to dissolution reaction with uniform stirring. The reaction temperature was raised to 80 C. for one-hour reaction, and then raised to 120 C. for two-hour reaction. Next, the reaction temperature was continuously raised to 170 C. for two-hour reaction. After the reaction was completed, the reactor was cooled down to room temperature. A thermally conductive resin (PAI resin) of this comparative example was thus prepared. Next, the thermal conductivity value of the resin material was tested and is listed in Table 4. After the above steps were completed, the resin was kept in a sealed PE bottle.

(66) TABLE-US-00004 TABLE 4 Comparative Example 1 2 Trimellitic anhydride + + (TMA) Diisocyanate MDI MDI Dianhydride Dicarboxylic acid StDA Thermal conductivity value 0.18 0.24 (W/mK) Molar ratio (m:n:o) 100:0:0 95:0:5

Example 17

(67) The Preparation of the Thermal Interface Material (1) (with 50% thermally conductive powder of aluminum oxide)

(68) The thermally conductive resin (PI resin) prepared by Example 4 was mixed with 50 wt % of thermally conductive powder of aluminum oxide to form a thermal interface material of this example. The thermal conductivity value and volume resistivity of the thermal interface material were then tested and are listed in Table 5.

Example 18

(69) The Preparation of the Thermal Interface Material (2) (with 50% thermally conductive powder of aluminum oxide)

(70) The thermally conductive resin (PAI resin) prepared by Example 15 was mixed with 50 wt % of thermally conductive powder of aluminum oxide to form a thermal interface material of this example. The thermal conductivity value and volume resistivity of the thermal interface material were then tested and are listed in Table 5.

Comparative Example 3

(71) The Preparation of Conventional Thermal Interface Material (with 85% Thermally Conductive Powder of Aluminum Oxide)

(72) The thermally conductive resin (PAI resin) prepared by Comparative Example 1 was mixed with 85 wt % of thermally conductive powder of aluminum oxide to form a thermal interface material of this example. The thermal conductivity value and volume resistivity of the thermal interface material were then tested and are listed in Table 5.

(73) TABLE-US-00005 TABLE 5 Example 17 Example 18 Com. Example 3 Thermally PI PAI PAI conductive resin Thermally Aluminum Aluminum Aluminum conductive powder oxide oxide oxide (50 wt %) (50 wt %) (85 wt %) Thermal 4.6 5.0 3.2 conductivity value (W/mK) Volume resistivity 10.sup.13 10.sup.13 10.sup.11 (-cm) Breakdown voltage 1.5 1.5 1.1 (V)

(74) In the disclosure, trimellitic anhydride (TMA) and the specific diisocyanate (for example MDI, TODI, NDI or a mixture thereof), dianhydride (for example PMDA, BTDA, ODPA, BPDA or a mixture thereof) and dicarboxylic acid (for example StDA) are adopted to proceed to polymerization reaction with the specific ratios to prepare a thermally conductive resin (PAI or PI) with characteristics of high thermal conductivity and high dielectric insulation. The thermal conductivity value of the present thermally conductive resin is higher than that of conventional thermally conductive resin about 1.3 to 2.3 times. Additionally, when a thermal interface material is further prepared, merely a small amount (about 50 wt % below) of thermally conductive powder (for example ceramic powder) is added in the thermally conductive resin, and the thermal interface material with characteristic of high thermal conductivity is thus obtained due to the present thermally conductive resin with superior characteristic of thermal conductivity. In a conventional thermal interface material, however, even though more than 80 wt % of thermally conductive powder is added, it still fails to reach the thermal conductivity value of the present thermally conductive resin.

(75) It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed embodiments. It is intended that the specification and examples be considered as exemplary only, with the true scope of the disclosure being indicated by the following claims and their equivalents.