A novel purging compound is disclosed which facilitates and improves extrusion of resins where the extruded material is transitioned from a polyamide to a polyethylene or other polyolefin. Compositions according to the invention comprise a major portion of non-polar base polymer compound with an ethylene-methacrylate copolymer; up to 15% of a particulate mineral and about 1% of an antioxidant.
A purging compound for purging an extruder of polyamides or other polar thermoplastic resins for transitioning to the extrusion of a non-polar thermoplastic resin, includes a non-polar base polymer compounded with an ethylene-methacrylate copolymer, up to 15% of a mineral, and about 1% of a suitable antioxidant.
Ultra-fine sodium bicarbonate powder (mean particle size less than 5 microns) is produced by the mixing and reaction under agitation at control temperatures of solutions of ammonium bicarbonate and sodium chloride. Precipitated sodium bicarbonate is separated by filtration as a slurry which is dried to produce ultra-fine sodium bicarbonate. Ultra-fine sodium bicarbonate produced by this method also exhibits a narrow particle size distribution which is advantageous in blowing agents for thermoplastic resins, to produce a foamed resin with small cells of a narrow size distribution.
A method is described for preparing liquid concentrates of additives for incorporation in polymers, particularly polymers prepared in solution or slurry phase polymerization media. Additive concentrates according to the invention are characterized by a finer dispersion than would result from the direct addition of particulate or granular additives to the same liquid solvent.
C09K 15/18 - Compositions anti-oxydantesCompositions inhibant les modifications chimiques contenant des composés organiques contenant de l'azote contenant une fraction amine ou imine
C09K 15/02 - Compositions anti-oxydantesCompositions inhibant les modifications chimiques contenant des composés inorganiques
C09K 15/30 - Compositions anti-oxydantesCompositions inhibant les modifications chimiques contenant des composés organiques contenant un hétérocycle avec au moins un azote comme membre du cycle
C09K 15/32 - Compositions anti-oxydantesCompositions inhibant les modifications chimiques contenant des composés organiques contenant du bore, du silicium, du phosphore, du sélénium, du tellure ou un métal
C09K 15/08 - Compositions anti-oxydantesCompositions inhibant les modifications chimiques contenant des composés organiques contenant de l'oxygène contenant une fraction phénol ou quinone
B29B 9/06 - Fabrication de granulés par division de matière préformée sous forme de filaments, p. ex. combinée avec l'extrusion
5.
LIQUID COMPOSITIONS OF POLYMER ADDITIVES AND METHOD FOR THEIR PREPARATION
A method is described for preparing liquid concentrates of additives for incorporation in polymers, particularly polymers prepared in solution or slurry phase polymerization media. Additive concentrates according to the invention are characterized by a finer dispersion than would result from the direct addition of particulate or granular additives to the same liquid solvent.
A method is described for preparing liquid concentrates of additives for incorporation in polymers, particularly polymers prepared in solution or slurry phase polymerization media. Additive concentrates according to the invention are characterized by a finer dispersion than would result from the direct addition of particulate or granular additives to the same liquid solvent.
Ultra-fine sodium bicarbonate powder (mean particle size less than 5 microns) is produced by the mixing and reaction under agitation at control temperatures of solutions of ammonium bicarbonate and sodium chloride. Precipitated sodium bicarbonate is separated by filtration as a slurry which is dried to produce ultra-fine sodium bicarbonate. Ultra-fine sodium bicarbonate produced by this method also exhibits a narrow particle size distribution which is advantageous in blowing agents for thermoplastic resins, to produce a foamed resin with small cells of a narrow size distribution.
B01J 2/02 - Procédés ou dispositifs pour la granulation de substances, en généralTraitement de matériaux particulaires leur permettant de s'écouler librement, en général, p. ex. en les rendant hydrophobes par division du produit liquide en gouttelettes, p. ex. par pulvérisation, et solidification des gouttelettes
C01D 7/38 - Préparation sous forme de granulés, morceaux ou autres produits façonnés