Pressure-sensitive copying paper containing lactone compounds of pyridine-carboxylic acid
US3936564A · kind A · utility
12Cited by
2References
2Claims
0Family size
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Key dates
| Filing date | Jul 24, 1974 |
| Grant date | Feb 3, 1976 |
| Priority date | — |
| Expiry date | Jul 24, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/252
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A pressure-sensitive copying paper comprising an adsorbent solid acid and a microencapsulated color former capable of forming a distinct color when reacted with the adsorbent acid coated on the same or a different surface of a support or supports, the microencapsulated color former being at least one lactone compound of a pyridine-carboxylic acid represented by the formula ##SPC1## Or a mixture thereof, wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and A are as defined hereinafter, is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.