Back to results
US 4,497,934 AGranted
Method for the production of melamine/aldehyde filaments
AssigneeAmerican Cyanamid Company
InventorWilliam E. Streetman
Life of this patent
Estimating the term…
Abstract
A method for the production of melamine/aldehyde filaments by reacting a crystalline melamine and a solid aldehyde generating compound in a single pass reactor and extruding the resultant molten mass through a spinnerette into a reaction chamber maintained under specific temperature conditions and in the presence of air is disclosed.
Claims10
A continuous method for the preparation of a melamine-aldehyde filament which comprises:
- (a) charging a crystalline melamine compound and a solid aldehyde generating compound into a single pass reactor at a temperature ranging from about 120.degree. C. to about 180.degree. C. for from about 30 seconds to about 5 minutes to form a molten liquid having a melt viscosity ranging from about 1000-5000 poises,
- (b) immediately extruding said molten liquid through a spinnerette into a reaction chamber, the first 1/3 of which is maintained at a temperature ranging from about 80.degree.-300.degree. C., the second 1/3 of which is maintained at a temperature ranging from about 150.degree.-400.degree. C. and the third 1/3 of which is maintained at a temperature ranging from about 185.degree.-400.degree. C., in the presence of air, and
- (c) recovering the resultant filament.
A continuous method for the preparation of a melamine-aldehyde resin filament which comprises:
- (a) charging a crystalline melamine compound and a solid aldehyde generating compound into a single pass reactor at a temperature ranging from about 120.degree. C. to about 180.degree. C. for from about 30 seconds to about 5 minutes to form a molten liquid having a melt viscosity ranging from abut 1000-5000 poises,
- (b) maintaining the temperature of said molten liquid at from about 80.degree. to 150.degree. C.,
- (c) extruding the resultant temperature-maintained molten liquid through a spinnerette into a reaction chamber, the first 166 of which is maintained at a temperature ranging from about 80.degree.-300.degree. C., the second 1/3 of which is maintained at a temperature ranging from about 150.degree.-400.degree. C. and the third 1/3 of which is maintained at a temperature ranging from about 185.degree.-400.degree. C., in the presence of air, and
- (d) recoverying the resultant filament.
1 more element
Dependencies are inferred from the claim text.