Process for substantially eliminating surface melt fracture during extrusion of thermoplastic polymers
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorsArakalgud V. Ramamurthy, Mahmoud R. Rifi
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Abstract
A process for substantially eliminating surface melt fracture during extrusion of a thermoplastic polymer such as a molten narrow molecular weight distribution, linear, ethylene copolymer, by incorporating into the thermoplastic polymer a wood rosin or wood rosin derivative.
Claims9
A process for substantially eliminating surface melt fracture during extrusion of narrow molecular weight distribution, linear ethylene copolymer under conditions of flow rate and melt temperature which would otherwise produce such melt fracture which comprises incorporating into said ethylene copolymer a wood rosin or a wood rosin derivative and thereafter extruding said ethylene copolymer containing said rosin or wood rosin derivative, said rosin or wood rosin derivative being employed in an amount sufficient to substantially eliminate surface melt fracture during extrusion of said ethylene copolymer.
A process for substantially reducing surface melt fracture during extrusion of a molten narrow molecular weight distribution, linear, ethylene copolymer, under conditions of flow rate and melt temperature which would otherwise produce such surface melt fracture which comprises incorporating into said copolymer a glycerol ester of abietic acid and thereafter extruding said copolymer, said glycerol ester being employed in an amount of about 0.5% to about 5% based on the weight of the copolymer.
Dependencies are inferred from the claim text.