Rigid extrusion profiles of chlorinated polyvinyl chloride polymer blends having improved surface properties and method of manufacture
US5641826A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1995 |
| Grant date | Jun 24, 1997 |
| Priority date | — |
| Expiry date | Oct 11, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L23/286
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Blends of chlorinated polyvinyl chloride and chlorinated polyethylene and methods for preparing extruded profiles such as a window spacer, a glazing bead, a window lineal, and a track for lighting, having smooth surface characteristics are disclosed. The blends comprise 100 weight parts CPVC containing from 62% to 72% chlorine, preferably 65% to 71% chlorine and from 10 to 30 weight parts, preferably 15 to 25 parts of chlorinated polyethylene containing from 25 to 45% chlorine and extruding the blend. The preferred embodiments of the invention are further defined by a particular combination for the chlorine content of CPVC, the real weight average molecular weight of CPE (M.sub.w) and polydispersity (M.sub.w /M.sub.n), defined as the ratio of the weight average to number average molecular weight, and extrusion shear rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.