| 摘要 |
A process for preparing PPE microspore dispersion includes steps of: dissolving a high-molecular polyphenylene ether in a first solvent at 45-110° C. to form a dissolution liquid; adding processing aids and well mixing the dissolution liquid into a dispersed phase; cooling the dissolution liquid to 42-80° C., and adding a second solvent to generate PPE microspores via PPE to wrap around the processing aids; cooling the dissolution liquid to 0-40° C. to obtain PPE microspore dispersions for use in application for impregnation processes performed below 40° C., thereby high-temperature impregnation equipment are no longer needed, and copper clad laminates made of using the PPE microspore dispersion enjoy excellent physical properties including high Tg, low Dk, low Df and high copper foil's peel strength. |
| 主权项 |
1. A process for preparing a polyphenylene ether microspore dispersion comprising the following steps:
(a) selecting a high-molecular polyphenylene ether (HM-PPE) that has a number-average molecular weight (Mn) ranging between 12,000 g/mole and 30,000 g/mole, and a low-molecular polyphenylene ether (LR-PPE) that has a number-average molecular weight (Mn) ranging between 800 g/mole and 6,000 g/mole, respectively; (b) selecting a first solvent that dissolves the HM-PPE at 45-110° C., and selecting a second solvent that does not dissolve the HM-PPE;
wherein the first solvent is one or more selected from the group consisting of benzene, methylbenzene, dimethylbenzene, trimethylbenzene and any combinations thereof; andwherein the second solvent is one or more selected from the group consisting of dimethyl ketone, methyl ethyl ketone, methyl isobutyl ketone and any combinations thereof; (c) dissolving the HM-PPE of Step (a) in the first solvent at a temperature ranging between 45° C. and 110° C. to form a PPE-based dissolution liquid; (d) adding the LR-PPE of Step (a) and processing aids being chosen as additives together into the PPE-based dissolution liquid of Step (c), and then performing adequate agitation until the LR-PPE and the processing aids are evenly dispersed throughout the dissolution liquid;
wherein, the processing aids are one or more selected from the group consisting of a polybutadiene resin, a flame retardant, a filler, a crosslinking agent, an initiator and any combinations thereof; (e) cooling the PPE-based dissolution liquid of Step (d) to a temperature ranging between 42° C. and 80° C., and adding the second solvent of Step (b) into the PPE-based dissolution liquid of Step (d) under a weight ratio of the first solvent to the second solvent ranging between 0.10 and 2.0, to cause the PPE to wrap around the processing aids to form as PPE microspores occurred constantly in the PPE-based dissolution liquid; and (f) cooling the PPE-based dissolution liquid of Step (e) to a temperature ranging between 0° C. and 40° C., so as to obtain the PPE microspore dispersion that is suitable for impregnation processes performed below 40° C. |
