pH-sensitive microparticles with matrix-dispersed active agent
US8859288B2 · kind B2 · utility
1Cited by
12References
35Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 5, 2012 |
| Grant date | Oct 14, 2014 |
| Priority date | — |
| Expiry date | Apr 11, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2989
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods to produce pH-sensitive microparticles that have an active agent dispersed in a polymer matrix have certain advantages over microcapsules with an active agent encapsulated in an interior compartment/core inside of a polymer wall. The current invention relates to pH-sensitive microparticles that have a corrosion-detecting or corrosion-inhibiting active agent or active agents dispersed within a polymer matrix of the microparticles. The pH-sensitive microparticles can be used in various coating compositions on metal objects for corrosion detecting and/or inhibiting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.