Process for making ABS polymeric blends
US6492467B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 2001 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | May 9, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L55/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the preparation of a blend of ABS polymers is disclosed. The invention comprises introducing a core/shell grafted rubber in the form of powder (crumb) to at least one stage of the continuous mass polymerization process for making an ABS polymer. Accordingly, the process comprises, in sequence, steps (i) through (iii) wherein(i) refers to charging into a first reactor a material system containing primarily monoalkenylaromatic monomer and an ethylenically unsaturated nitrile monomer having dissolved therein diene rubber under conditions to promote at least partial polymerization to form a partially polymerized first mixture and where(ii) refers to polymerizing the first mixture in a subsequent reactor to form a subsequent mixture and where(iii) refers to devolatilizing the subsequent mixture,and introducing said core/shell grafted rubber into at least one of step (i), (ii) and (iii) to yield a blend having a dispersed grafted rubber phase with a bimodal or multimodal particle size distribution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.