Pressure sensitive recording sheets
US4275906A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 1979 |
| Grant date | Jun 30, 1981 |
| Priority date | — |
| Expiry date | Jul 18, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/914
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Pressure sensitive recording sheets are prepared characterized by containing on one side thereof color former dissolved in a solvent which is one or a mixture of alkoxy diphenyl alkanes having the following structure: ##STR1## where R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are H or a straight or branched chain alkyl group of 1 to 8 carbon atoms and can be the same or different; R.sub.5 is a straight or branched chain alkyl group of 1 to 9 carbon atoms; R.sub.6 is a straight or branched chain alkyl group of 1 to 8 carbon atoms; x is 0, 1 or 2; y is 1 or 2 and n is 1 or 2, with the proviso that the sum of the carbon atoms in R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 does not exceed 9 and with the further proviso that where the alkoxy diphenyl alkane is a solid to viscous liquid, at least one diluent or at least one other generally liquid solvent or mixture thereof is present. The treated side of the sheet is brought into contact with a developer. Upon application of pressure, color is produced by reaction between the color former and the developer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.