Production method of microcapsules
US5362565A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 1993 |
| Grant date | Nov 8, 1994 |
| Priority date | — |
| Expiry date | May 12, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2985
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A production method of microcapsules using a copolymer including at least three types of monomers including 50 to 90 by weight of acrylic acid, 2 to 40% by weight of an acrylamidealkylsulfonic acid such as acrylamidepropanesulfonic acid, and 2 to 15% by weight of an alkylacrylate such as butylacrylate as an anionic water-soluble polymer as an emulsifier and a reaction promoter for a core substance of the microcapsules, whereby obtaining microcapsules for use in pressure-sensitive copy paper having wall films of an amine-aldehyde condensation polymer which reduces spot staining generated when the capsules are used in pressure-sensitive copy paper by reducing coarse particles present in traces in the microcapsule slurry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.