Thermoexpandable microcapsule and production
US5861214A · kind A · utility
22Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Jan 19, 1999 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2987
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The object of the present invention is to provide a thermoexpandable microcapsule which can be expanded at a lower temperature without decrease of various properties such as chemical resistance and heat resistance; said thermoexpandable microcapsule contains at least two kinds of volatile expanding agents having different boiling points lower than softening temperature of a polymeric material forming a shell, production thereof; and a method of expanding the microcapsule in which it is subjected to first heating below the starting temperature of expanding and then to the second heating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.