Polymer ahoy material and process for production thereof
US5874521A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1994 |
| Grant date | Feb 23, 1999 |
| Priority date | — |
| Expiry date | Nov 21, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/921
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A reactive, powdered polymeric material, the polymeric material comprising polymer particles (i) having an average particle size less than about 1000 .mu.m; (ii) which are made up of a plurality of smaller particles; and (iii) having energy stored therein. A process for producing the powdered polymeric material is described. The process comprises the steps of: (i) placing polymeric material in a milling chamber equipped with impact means; (ii) accelerating the impact means to at least about 50 ml/s.sup.2 ; (iii) impacting the polymeric material with the impact means; (iv) repeatedly welding and fracturing the polymeric material; and (v) repeating Steps (ii), (iii) and (iv) until a powdered polymeric material is produced having an average particle size less than about 1000 .mu.m. During Steps (iii) and (iv), the temperature of the milling chamber is maintained below the glass transition temperature of the polymeric material. The powdered particulate material particularly suited for processing a single polymer or a mixture of two or more polymers which are otherwise difficult to process at a temperature less than the melting point of the polymer to produce a polymer alloy having desi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.