Lubricating system composition for extrusion of polyvinyl chloride resin binder
US4539124A · kind A · utility
2Cited by
3References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1984 |
| Grant date | Sep 3, 1985 |
| Priority date | — |
| Expiry date | Feb 10, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2993
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A lubricating system composition for the extrusion of polyvinyl chloride resin conduits is provided by treating silica fume particles at least in part with a lubricant to form a premix additive for polyvinyl chloride extrusion compounds whereby the resulting product has unique and particularly advantageous physical characteristics which makes possible the reduction in wall thickness and an increase in loading of calcium carbonate to effect a material reduction in cost of manufacture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.