Reduced melt viscosity rigid polyvinylchloride (PVC) composition
US7572862B2 · kind B2 · utility
1Cited by
7References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 8, 2005 |
| Grant date | Aug 11, 2009 |
| Priority date | — |
| Expiry date | Jan 10, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/0094
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a process aid for use in rigid thermoplastic compositions, and especially in rigid polyvinylchloride (PVC) compositions. The process aid is an acrylic terpolymer of methylmethacrylate, butyl acrylate and styrene at an optimal ratio to produce a significant reduction in melt process viscosity. The resulting reduction in extrusion melt torques enables manufacturers of rigid PVC products to have higher throughput production rates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.