Melt processable thermoplastic polymer composition

A melt processing, polymer technology, applied in the field of melt processable thermoplastic polymer composition, can solve the problems of high back pressure, weak cell wall, affecting film orientation, etc.

Inactive Publication Date: 2002-06-19
德弘公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, extrusion at higher temperatures results in weaker cell walls during tubular film extrusion, and wider die gaps affect film orientation
[0004] There are other frequent problems in the extrusion process of thermoplastic polymers: including the accumulation of polymer at the die (called die build up (die build up) or die drool), extrusion Excessive back pressure on exit and excessive polymer degradation or low melt strength due to high extrusion temperatures
[0016] While these known additives provide improved melt processability in olefin polymers, there is no evidence that they are particularly successful in non-aliphatic polymers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Resin A, a syndiotactic polystyrene (Questra MA406 from Dow Chemical Company), was extruded at a target melt temperature of 300°C.

[0074] Table 3 below shows the measured viscosities of resins with and without additives. The addition amount of auxiliary agent is 1000ppm. In each case, the first shear rate at which melt fracture is observed (melt fracture occurs) is indicated. The shear rate of melt fracture onset of resin without additives was about 100 / sec, while the shear rate of melt fracture of resins with all additives was greater than 1000 / sec.

[0075] Table 4 summarizes the performance of PPA. The addition of PPA to Resin A delayed the onset of melt fracture, resulting in higher shear rates and lower pressures.

[0076] Resin A Baseline

[0077] * Melt fracture starts

[0078] sample

[0079] *Interpolated value

Embodiment 2

[0081] Resin C, polyamide 6,6 (Celanese 1100), was extruded at a target melt temperature of 300°C. Additives are added via concentrate to a final concentration of 1000ppm. For extrusion of nylon, replace CaCO with a purge compound containing silica (Polybatch KC-15, A. Schulman) 3 Masterbatch. Two experiments were repeated, one with CaCO 3 The masterbatch washes the extruder and the second washes the extruder with the silica masterbatch.

[0082] Table 5 gives the shear stress versus shear rate for the base resin and the PPA-containing resin. Samples of PPA-5 were tested in duplicate. In each case, lower shear stress was observed with PPA. Shear stress was interpolated at a fixed shear rate of 600 / sec for comparison. This is shown in Table 6 together with the calculated pressure drop achieved due to PPA. Table 5 clearly shows the benefits provided by PPA. Among them, the multi-peak sample (PPA-5) has better performance than the single-peak sample (PPA-3).

[0083] ...

Embodiment 4

[0088] Resin D, polyethylene terephthalate (Eastapak 9663 from Eastman) was extruded at a target melt temperature of 305°C.

[0089] Table 8 shows the shear stress versus shear rate for the resin and the resin containing PPA. It can be clearly seen that the stress decreases at higher shear rates. Here, lower Mw (ie higher MFI) provides better performance. This shows that the PPA is preferably matched to the resin used. Table 9 summarizes the pressure drop achieved for Resin D.

[0090] resin

[0091] sample

[0092] *Interpolated value

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Abstract

The present invention relates to a melt processable polymer composition and a method of improving the melt processability of the host polymer. Said melt processable polymer composition comprises a thermoplastic non-aliphatic host polymer and a minor but effective amount of a fluoropolymer processing aid.

Description

technical field [0001] The present invention relates to melt-processable thermoplastic polymer compositions comprising a non-aliphatic (e.g., non-hydrocarbon polymer, aromatic polymer, or non-hydrocarbon / aromatic polymer) unfluorinated host polymer and a Fluoropolymers. Background technique [0002] For any melt-processible thermoplastic polymer composition, there is a critical shear rate above which the surface of the extrudate becomes rough and below which the extrudate becomes smooth. See eg R.F. Westover, Melt Extrusion, Encyclopedia of Polymer Science and Technology, Vol. 8, pp. 573-81 (John Wiley and Sons 1969). The requirement to obtain a smooth extrudate surface is opposed to the economic interest of extruding the polymer composition at the fastest possible speed (ie high shear rate) and must be optimized. [0003] A. Rudin et al., Fluorocarbon Elastomer Aids Polyolefin Extrusion (Fluorocarbon Elastomer Helps Polyolefin Extrusion), Plastics Engineering (Plastic Eng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/00B29B7/00B29K27/12B29K77/00C08F214/18C08L101/00
CPCC08L101/00
Inventor C·拉瓦利M·P·荻龙T·J·布隆S·S·伍兹S·S·勒布兰克
Owner 德弘公司
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