Polyurethane polyurea particles and process for production thereof
US5155165A · kind A · utility
7Cited by
3References
35Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 30, 1990 |
| Grant date | Oct 13, 1992 |
| Priority date | — |
| Expiry date | May 30, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K2003/2241
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyurethane polyurea particles are obtained by an interfacial polymerization reaction between a hydrophobic phase which is capable of forming a three-dimensional crosslinked structure by reaction and is a mixture comprising a polyisocyanate compound and a polyhydroxy compound with the isocyanate groups being stoichiometrically excessive, and a polyamine in an amount not more than one equivalent of the stoichiometrically excessive isocyanate groups in the hydrophobic phase, and by polyurethanization reaction inside the particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.