Silane-treated forsterite fine particles and production method therefor, and organic solvent dispersion of silane-treated forsterite fine particles and production method therefor

Patent metadata

Field	Value
Publication number	US-10501637-B2
Application number	US-201515315286-A
Country	US
Kind code	B2
Filing date	Aug 6, 2015
Priority date	Aug 7, 2014
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

The invention provides silane-treated forsterite microparticles having a specific surface area of 5 to 100 m 2 /g, wherein 1 to 5 silyl groups are bound to 1 nm 2 of the surface area thereof.

First claim

The invention claimed is:

1. An organic solvent dispersion of silane-treated forsterite microparticles, the dispersion comprising:
silane-treated forsterite microparticles having a specific surface area of 5 to 100 m 2 /g, and having 1 to 5 silyl groups bound to 1 nm 2 of the surface area thereof; and
a dispersion medium containing an organic solvent,
wherein the silyl groups are represented by the following formula (1):
—Si(R 1 ) n (X) 3-n   (1)

wherein:
R 1 represents at least one member selected from the group consisting of an alkyl group, an aryl group, a halo-alkyl group, a halo-aryl group, an alkenyl group, an epoxy group, a (meth)acryloyl group, a mercapto group, an amino group, and a cyano group, each of which is substituted or unsubstituted and has a solubility parameter (SP), estimated through the Fedors method, of 5.5 to 11.5;
X represents at least one of a hydroxyl group and a C1 to C4 alkoxy group; and
n is an integer of 0 to 3.

2. An organic solvent dispersion of silane-treated forsterite microparticles according to claim 1 , wherein the dispersion medium containing an organic solvent has a solubility parameter (SP) of 8 to 15.

3. An organic solvent dispersion of silane-treated forsterite microparticles according to claim 1 , wherein the organic solvent is at least one member selected from the group consisting of methyl alcohol (SP=14.5), ethyl alcohol (SP=12.7), isopropyl alcohol (SP=11.5), dimethylformamide (SP=12.0), methylcellosolve (SP=11.4), ethylcellosolve (SP=9.9), butylcellosolve (SP=8.9), ethylene glycol (SP=14.6), propylene glycol monomethyl ether (SP=10.5), propylene glycol monomethyl ether acetate (SP=8.7), 1-pentanol (SP=11.0), methyl ethyl ketone (SP=9.3), methyl isobutyl ketone (SP=8.3), cyclohexanone (SP=9.8), ethyl acetate (SP=9.1), butyl acetate (SP=8.5), toluene (SP=8.9), methyl methacrylate (SP=9.9), pentaerythritol triacrylate (SP=10.0), dipentaerythritol hexaacrylate (SP=9.1), bisphenol A epoxy resin (SP=10.4), and bisphenol F epoxy resin (SP=10.8).

4. An organic solvent dispersion of silane-treated forsterite microparticles according to claim 1 , wherein the organic solvent dispersion has a water content of 5 mass % or less.

5. An electric wire coating material formed from the organic solvent dispersion of silane-treated forsterite microparticles as recited in claim 1 .

6. An insulating coating material formed from the organic solvent dispersion of silane-treated forsterite microparticles as recited in claim 1 .

7. An insulator formed from the organic solvent dispersion of silane-treated forsterite microparticles as recited in claim 1 .

8. An electron tube part formed from the organic solvent dispersion of silane-treated forsterite microparticles as recited in claim 1 .

9. A circuit component substrate formed from the organic solvent dispersion of silane-treated forsterite microparticles as recited in claim 1 .

10. A semiconductor package formed from the organic solvent dispersion of silane-treated forsterite microparticles as recited in claim 1 .

11. A method for producing the organic solvent dispersion of silane-treated forsterite microparticles according to claim 1 , the method comprising the following steps (a) and (b):
step (a): a step of wet-crushing forsterite microparticles having a specific surface area of 5 to 100 m 2 /g in a dispersion medium containing an organic solvent by means of a bead mill, to thereby prepare an organic solvent dispersion; and
step (b): a step of adding, to the organic solvent dispersion prepared in step (a), an organic silicon compound represented by the following formula (2):
Si(R 1 ) n (X) 4-n   (2)

(wherein R 1 represents at least one member selected from the group consisting of an alkyl group, an aryl group, a halo-alkyl group, a halo-aryl group, an alkenyl group, an epoxy group, a (meth)acryloyl group, a mercapto group, an amino group, and a cyano group, each of which is substituted or unsubstituted and has a solubility parameter (SP), estimated through the Fedors method, of 5.5 to 11.5; X represents at least one of a hydroxyl group and a C1 to C4 alkoxy group; and n is an integer of 0 to 3) and/or a hydrolyzate thereof, so that the ratio by mass of organic silicon compound to forsterite microparticles (organic silicon compound/forsterite microparticles) is adjusted to 0.01 to 0.50, to thereby bind the silyl groups represented by the formula (1) onto the surfaces of the forsterite microparticles.

12. A method for producing an organic solvent dispersion of silane-treated forsterite microparticles according to claim 11 , wherein the dispersion medium containing an organic solvent has a solubility parameter (SP) of 8 to 15.

13. A method for producing an organic solvent dispersion of silane-treated forsterite microparticles according to claim 11 , wherein the organic solvent is at least one member selected from the group consisting of methyl alcohol (SP=14.5), ethyl alcohol (SP=12.7), isopropyl alcohol (SP=11.5), dimethylformamide (SP=12.0), methylcellosolve (SP=11.4), ethylcellosolve (SP=9.9), butylcellosolve (SP=8.9), ethylene glycol (SP=14.6), propylene glycol monomethyl ether (SP=10.5), propylene glycol monomethyl ether acetate (SP=8.7), 1-pentanol (SP=11.0), methyl ethyl ketone (SP=9.3), methyl isobutyl ketone (SP=8.3), cyclohexanone (SP=9.8), ethyl acetate (SP=9.1), butyl acetate (SP=8.5), toluene (SP=8.9), methyl methacrylate (SP=9.9), pentaerythritol triacrylate (SP=10.0), dipentaerythritol hexaacrylate (SP=9.1), bisphenol A epoxy resin (SP=10.4), and bisphenol F epoxy resin (SP=10.8).

14. A method for producing an organic solvent dispersion of silane-treated forsterite microparticles according to claim 11 , wherein the production method further includes the following step (c):
step (c): a step of substituting at least a part of the dispersion medium in the organic solvent dispersion produced in step (b), by another organic solvent.

15. A method for producing an organic solvent dispersion of silane-treated forsterite microparticles according to claim 11 , wherein the organic solvent dispersion has a water content of 5 mass % or less.

16. A method for producing silane-treated forsterite microparticles, the method comprising the following steps (A) and (B):
step (A): a step of producing an organic solvent dispersion of silane-treated forsterite through a production method as recited in claim 11 ; and
step (B): a step of removing the dispersion medium contained in the organic solvent dispersion.

Assignees

• Nissan Chemical Ind Ltd

Inventors

• Isaji Tadayuki
• Hida Masahiro

Classifications

• C01B33/22

  Magnesium silicates · CPC title

• C09C3/12 Primary

  Treatment with organosilicon compounds {(C09C3/006 takes precedence)} · CPC title

• C09C1/28

  Compounds of silicon {(C09C1/0009, C09C1/0015, C09C1/0078 take precedence)} · CPC title

• C09D17/00

  Pigment pastes, e.g. for mixing in paints (artists' paints C09D5/06) · CPC title

• C09C3/006 Primary

  Combinations of treatments provided for in groups C09C3/04 - C09C3/12 · CPC title