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RESIN FENOLAT TIPE NOVOLAK ORTO TINGGI DENGAN BERAT MOLEKUL BESAR
RESIN FENOLAT TIPE NOVOLAK ORTO TINGGI DENGAN BERAT MOLEKUL BESAR
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机译:分子量大的高或高酚醛清漆型酚醛树脂
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摘要
Provided is a high-molecular weight high-ortho novolak type phenolic resin excellent in handleability, heat resistance characteristics, curability and electric characteristics suitable for various uses and superior in balance of properties. This high-molecular weight high-ortho novolak type phenolic resin is a condensate of a trifunctional phenol compound with an aldehyde compound, is soluble in solvents, has a weight- average molecular weight of 50,000 or more calculated by polystyrene standard, has methylene bonds at ortho-ortho position in respect to phenolic hydroxyl group in an amount of 55% or more based on total methylene bonds, and has an extraction water electric conductivity of 10 . mu.S/cm or less.
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