Diene/acrylate based impact modifier for PVC
US4443585A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 12, 1983 |
| Grant date | Apr 17, 1984 |
| Priority date | — |
| Expiry date | Jul 12, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S525/902
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Impact modifiers having high efficiency at low levels and at low temperatures comprising at least three stages, Stage A being a non-crosslinked polymer of at least 70% butadiene and at least 10% lower alkyl (C.sub.2 -C.sub.8) acrylate, Stage B being a polymer of at least 80% styrene, and Stage C containing at least 50% methyl methacrylate and at least 1% alkyl (C.sub.1 -C.sub.4) acrylate, the ratio of Stages A:B:C, excluding optional additional stages, being about 70-85:10-15:10-20, the ratio of stages C:B being at least 1, and Stage A being non-agglomerated are disclosed. Also disclosed are methods of preparing the impact modifier and thermoplastic polymer compositions containing the impact modifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.