Curing agent for epoxy resins and epoxy resin composition
US6881799B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 2002 |
| Grant date | Apr 19, 2005 |
| Priority date | — |
| Expiry date | Jan 9, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/0002
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A curing agent for epoxy resins, comprising (a) 30 to 99 parts by weight of (i) a modified phenol resin, which is obtained by polycondensation of a heavy oil or pitch, a phenol and an aldehyde compound in the present of an acid catalyst, and/or of (ii) a a phenol resin having a hydrocarbon group with small polarity between phenol nuclei represented by the following general formula (I): wherein R1's may be the same or different from each other and each represent an alkyl group having 1 to 10 carbon atoms, substituted or nonsubstituted phenyl group, substituted or nonsubstituted aralkyl group or alkoxy group; Z's may be the same or different from each other and each represent a divalent hydrocarbon group having 1 to 20 carbon atoms to which a nitrogen atom, oxygen atom, phosphorus atom or sulfur atom may be bonded, at least one Z in one molecule is a divalent hydrocarbon group having 5 to 20 carbon atoms to which a nitrogen atom, oxygen atom, phosphorus atom or sulfur atom may be bonded; n is a number of 0 to 8 as an average value; and p's may be the same or different from each other and each represent an integer of 0 to 3, (b) 1 to 70 parts by weight of a thiodiphenol compound repre…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.