US5177172A
Expired / Lapsed
US
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Selected methylol-substituted trihydroxybenzophenones and their use in phenolic resin compositions
Assignee: OCG Microelectronic Materials Inc
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Filing: 1991-02-13
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Granted: 1993-01-05
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Expires: 2011-02-13
Abstract
Abstract A methylol-substituted trihydroxybenzophenone of the formula (I): ##STR1## This methylol-substituted trihydroxybenzophenone may be reacted with selected phenolic monomers during or after the formation of a phenolic novolak resin thereby said resin having at least one unit of formula (II): ##STR2## wherein R and R 1 are individually selected from hydrogen, a lower alkyl group having 1 to 4 carbon atoms or a lower alkoxy group having 1 to 4 carbon atoms.
Inventors
- 👤 Medhat A. Toukhy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:59
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/022; G03F7/023; G03F7/0233; G03F7/0236
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
89 words
A phenolic novolak resin composition comprising the condensation reaction of precursors comprising para-creson, meta-creson, formaldehyde, and a methylol-substituted trihydroxybenzophenone having formula (I): ##STR9## and said phenolic novolak binder resin containing units of formula (II): ##STR10## wherein the starting mole ratio of meta-cresol to para-cresol is from about 70:30 to about 30:70; wherein the starting mole ratio of said methylol-substituted trihydroxybenzophenone to the other phenolic precursors is from 0.1:99.9 to 20:80; and wherein said resin has from about 0.1% to about 30% by moles of the units of formula (II).
Claim 2
Dependent Claim
89 words
A phenolic novolak resin composition comprising the condensation reaction of precursors comprising para-creson, meta-creson, formaldehyde, and a methylol-substituted trihydroxybenzophenone having formula (I): ##STR9## and said phenolic novolak binder resin containing units of formula (II): ##STR10## wherein the starting mole ratio of meta-cresol to para-cresol is from about 70:30 to about 30:70; wherein the starting mole ratio of said methylol-substituted trihydroxybenzophenone to the other phenolic precursors is from 0.1:99.9 to 20:80; and wherein said resin has from about 0.1% to about 30% by moles of the units of formula (II).
Claim 3
Dependent Claim
21 words
The phenolic novolak resin of claim 1 wherein said phenolic resin has a molecular weight from about 500 to about 25,000.
Claim 4
Dependent Claim
25 words
The phenolic resin of claim 1 wherein said units of formula (II) represent about 5% to about 10% by moles of said phenolic novolak resin.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-01-05 | 1996-07-06 | 1997-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-05 | 2000-07-06 | 2001-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-01-05 | 2004-07-06 | 2005-01-05 | $7700.00 | Window Closed / Lapsed |