Thermally stable phenolic resin compositions and their use in li

Details Thermally stable phenolic resin compositions and their use in li Thermally stable phenolic resin compositions and their use in li

1990-06-18

1991-10-01

Kight, III, John

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528156, 528160, 528165, C08G 808, C08G 1404

Patent

active

050534793

ABSTRACT:
A phenolic novolak resin comprising the product of a condensation reaction of an aldehyde comprising a haloacetaldehyde source or a mixture of a haloacetaldehyde source and a formaldehyde source with a phenolic monomer comprising at least one compound of the formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are individually selected from hydrogen or a one to four carbon alkyl group and wherein the ratio of total carbon atoms in the sum of R.sub.1, R.sub.2 and R.sub.3 to the total number of phenolic nuclei in said resin is from about 0.5:1 to about 1.5:1 in the presence of a solvent; said resin made by employing a molar ratio of total aldehyde to total phenolic monomers from about 0.33:1 to about 0.70:1. These phenolic resins are suitable for use in light-sensitive compositions (e.g. positive-working photoresists).

REFERENCES:
patent: 2902470 (1959-09-01), Kress
patent: 4340700 (1982-07-01), Edwards
patent: 4929649 (1990-05-01), Torbus et al.

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