Process for the continuous casting of liquid polymerizable compositions
US4089918A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1975 |
| Grant date | May 16, 1978 |
| Priority date | — |
| Expiry date | Dec 23, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C39/006
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process and apparatus for the continuous casting of a liquid polymerizable composition comprising feeding the liquid polymerizable composition together with a pair of continuous gaskets into a spacing between a pair of moving endless belts arranged such that the lower run of the upper belt is disposed above the upper run of the lower belt and said runs are driven concurrently in the same direction at substantially the same speed, said gaskets being fed such that they circumscribe both side end portions of the spacing to form a cavity, while moving together with the moving belts and keeping in contact with the opposing surfaces of the belts. Passing the composition through a portion of the path of the belts to partially polymerize said composition to such a viscosity that a common logarithm of its viscosity in terms of poise at the temperature of polymerization is within the range of 2 to 5, then passing a portion of the path thereof arranged so as to be curved at least once to bring its degree of polymerization within the range of 40 to 60 weight per cent, and thereafter passing the composition through a straight portion of the path for complete polymerization, said path for poly…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.