Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1988-11-30
1991-06-11
Schain, Howard E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
430165, 430192, 525504, 528127, 528155, 528112, 528165, C08G 804, C08G 808, C08G 810, G03C 160
Patent
active
050233114
ABSTRACT:
Disclosed is a novel, organic solvent-soluble novolak resin having a high molecular weight and an inherent viscosity of at least 0.1. This high-molecular-weight novolak resin can be prepared with a good reproducibility by reacting an aldehyde with a polyfunctional phenol at an aldehyde/polyfunctional phenol molar ratio of from 0.85 to 1.20 in the presence of an acid catalyst in a solution state. This high-molecular-weight novolak resin is valuable as the resin component of a radiation-sensitive resist.
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Schain Howard E.
Toray Industries Inc.
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