Mixed aldehyde novolak resins useful as high contrast high therm

Details Mixed aldehyde novolak resins useful as high contrast high therm Mixed aldehyde novolak resins useful as high contrast high therm

1990-11-16

1992-07-14

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

430 17, 430 18, 430141, 430192, 430311, 430326, 430330, 528129, 528156, C08G 804, C08G 1402, G03C 152, G03C 500

Patent

active

051304090

ABSTRACT:
Novolak resins are provided which are the condensation product of (a) a phenol, phenol derivative, or mixtures thereof, and (b) a mixture of formaldehyde or a formaldehyde precursor and an aromatic aldehyde. When the aromatic aldehyde is a monohydroxy aromatic aldehyde, the novolak resin is especially useful in positive photoresist formulations.

REFERENCES:
patent: 4308368 (1981-12-01), Kubo et al.
patent: 4477553 (1984-10-01), Yamamoto et al.
patent: 4529682 (1985-07-01), Toukhy
patent: 4536465 (1985-08-01), Uehara et al.
patent: 4642282 (1987-02-01), Stahlhofen

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