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Compositions of polymer processing additives and products made using such compositions

A technology of polymer and composition, which is applied in the field of composition of polymer technology additives, and can solve problems such as low speed and slow extrusion process

Inactive Publication Date: 2021-07-23
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These issues slow down the extrusion process as the process either has to be interrupted to clean the equipment or it has to be done at a lower rate

Method used

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  • Compositions of polymer processing additives and products made using such compositions
  • Compositions of polymer processing additives and products made using such compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] By mixing granular polypropylene (average particle size 3mm–5mm) with PPA composition (particle size 0.1mm–0.5mm) in a hot rotary mixer from Brabender Plasti-Corder at 180°C, 80rpm for 8 minutes to obtain Three concentrate compositions (1mm-5mm flakes) were prepared containing 1800ppm, Concentrate compositions of polymer processing additive compositions (PPA-1 to PPA-3) at 600 ppm and 300 ppm. PPA-1 contains a fluoropolymer processing additive (VDF-HPF copolymer with a Mooney viscosity of 40-60; ASTM D 1646-06 part A). PPA-2 contains a silicone processing additive (polydiorganosiloxane-amide block copolymer prepared according to US Patent Application 2011-0244159 (Papp et al.)). PPA-3 contains a mixture of PPA-1 and PPA-2 in a weight ratio of 1:1, that is, a 300ppm PPA-3 concentrate contains 150ppm PPA-1 and 150ppm PPA-2.

[0094] Extrusion experiments were carried out on a single-screw extruder to study rheological properties on a BRABENDER laboratory workstation. T...

Embodiment 2

[0102] Example 1 was repeated, this time using the polymer processing additive compositions PPA-3a and PPA-3b instead of PPA-3. PPA-3a and PPA-3b are mixtures of PPA-1 and PPA-2 with different weight ratios. PPA-3a comprises PPA-1 and PPA-2 in a weight ratio of 1:3. PPA-3b comprises PPA-1 and PPA-2 in a weight ratio of 3:1. Extrusion experiments using both PPA-3a and PPA-3b showed a greater pressure drop than experiments using PPA-1 and PPA-2. The pressure drop for PPA-3a and PPA-3b was lower than that observed for PPA-1 in Example 1. The pressure drop of PPA-3a is greater than that of PPA-3b.

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Abstract

A polymer processing additive (PPA) composition to improve melt extrusion of an extruded composition comprising an extruded thermoplastic polymer, the PPA composition comprising of at least one fluoropolymer having a Mooney viscosity (ML 1+10 @ 121 DEG C) of about 30 to about 90 (ASTM D 1646-06 Part A with an MV 2000 instrument (available from Alpha Technologies, Ohio) using a large rotor (ML 1+10) at 121 DEG C) and at least one polydiorganosiloxane polymer, wherein said extruded thermoplastic polymer is selected from a polypropylene homopolymer, a polypropylene copolymer, and a combination thereof. Also provided are a method for extruding polymers using the PPA compositions, as well as extruded products comprising the PPA composition.

Description

technical field [0001] The present invention relates to compositions of polymer technology (processing) additives comprising at least one silicone polymer and at least one fluoropolymer. Compositions of polymer processing additives (PPAs) are useful for melt processing of thermoplastic polymers. The invention also relates to products made via melt processing and using such PPAs, and methods of making such products. Background technique [0002] Extrusion of polymeric materials to obtain and form products is a large part of the plastics and polymer products industry. Any composition of melt-processed thermoplastic polymers having a critical shear rate above which the surface of the extrudate becomes uneven or deformed and below which the extrudate is smooth. The quality of the extruded product, and the overall success of the extrusion process, often depends on the interaction of the fluid material with the extrusion die. It is generally believed that when the shear rate e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16
CPCC08L27/16C08L23/10C08L2205/03C08L2205/06C08L83/10C08L23/12C08L2205/035C08L2207/04
Inventor 罗曼·I·瓦西里耶夫
Owner 3M INNOVATIVE PROPERTIES CO