Method of forming a thermally stable mixed aldehyde novolak resi

Details Method of forming a thermally stable mixed aldehyde novolak resi Method of forming a thermally stable mixed aldehyde novolak resi

1989-12-21

1991-03-05

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Imaged product

Nonsilver image

430 18, 430141, 430192, 430311, 430326, 430330, G03F 730, G03F 7023

Patent

active

049977342

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), Yamameto et al.
patent: 4536465 (1985-08-01), Uehara et al.
patent: 4642282 (1987-02-01), Stahlhofen

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