Organopolysiloxane-polyurea block copolymer release agents
US5290615A · kind A · utility
120Cited by
7References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1992 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | Aug 31, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31663
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Block copolymers having a repeating unit comprised of polysiloxane and urea segments are prepared by copolymerizing certain diaminopolysiloxanes with diisocyanates. The invention also provides novel diaminopolysiloxanes useful as precursors in the preparation of the block copolymers and a method of making such diaminopolysiloxanes. Pressure-sensitive adhesive compositions comprising the block copolymer are also provided as are sheet materials coated with the same.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.