发明名称 |
Process for producing highly reactive modified phenolic resin. |
摘要 |
A process for producing a highly reactive modified phenolic resin, comprising the steps of polycondensing a petroleum heavy oil or pitch, a formaldehyde polymer and a phenol in the presence of an acid catalyst to thereby prepare a modified phenolic resin; and reacting the resultant modified phenolic resin with a phenol in the presence of an acid catalyst but in the absence of a crosslinking agent such as a formaldehyde polymer to thereby lower the molecular weight of the modified phenolic resin. This highly reactive modified phenolic resin has a low number average molecular weight and a high phenol content, so that its resin melt viscosity is low and that it exhibits a markedly improved reactivity with an epoxy resin. Accordingly, the combination thereof with an epoxy resin provides a molding material suitable for producing a molding which is excellent in not only thermal resistance and moldability but also dimensional stability and other mechanical properties, especially a material for electrical or electronic part and a semiconductor sealer. |
申请公布号 |
EP0665249(A1) |
申请公布日期 |
1995.08.02 |
申请号 |
EP19950101064 |
申请日期 |
1995.01.26 |
申请人 |
KASHIMA OIL CO., LTD |
发明人 |
TSUMURA, MASAHIRO, C/O KASHIMA OIL CO.,LTD.;TASHIMA, MASAO, C/O KASHIMA OIL CO.,LTD.;MIYASITA, HIROMI, C/O KASHIMA OIL CO.,LTD. |
分类号 |
C08G8/28;C08G10/04;C08G14/04;C08L61/14;C08L63/00;H01B3/36 |
主分类号 |
C08G8/28 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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