Modified quinone-diazide group-containing phenolic novolak resins
US4681923A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1986 |
| Grant date | Jul 21, 1987 |
| Priority date | — |
| Expiry date | Feb 21, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S522/904
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An electrodepositable photosensitive modified phenolic novolak resin of general formula ##STR1## where Ar.sup.1 represents a divalent aromatic group linked through aromatic carbon atoms to the indicated groups --OR.sup.2 and --CH(R.sup.1)--, PA1 Ar.sup.2 represents a trivalent aromatic group linked through aromatic carbon atoms to the indicated groups --OR.sup.2 and --CH(R.sup.1)--, PA1 R.sup.1 represents a hydrogen atom or an alkyl, aryl or carboxyl group, PA1 R.sup.2 represents a hydrogen atom, an alkyl group which may be substituted by a hydroxyl or alkoxy group, or a group of formula --CO--R.sup.3 --COOH, --SO.sub.2 R.sup.4, --COR.sup.5 or --SO.sub.2 R.sup.5, at least 1% of the groups R.sup.2 representing a group --CO--R.sup.3 --COOH and at least 4% of the groups R.sup.2 representing a group --SO.sub.2 R.sup.4, PA1 R.sup.3 denotes a divalent aliphatic, cycloaliphatic, aromatic or araliphatic group, PA1 R.sup.4 denotes a 1,2-benzoquinone diazide group or 1,2-naphthoquinone diazide group PA1 R.sup.5 denotes a carboxyl-free monovalent group, and PA1 n denotes zero or an integer of 1 to 20. The resins are useful in printed circuit manufacture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.