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Enhanced polycarbonate extrusion grades

A technology described in polycarbonate, extrusion, applied in the field of thermoplastic compositions, capable of solving problems such as irregular processing or high release force, insufficient release behavior, deformation of ejected parts, etc.

Inactive Publication Date: 2015-06-03
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for relatively large components or difficult profiles, the release behavior is often insufficient
Insufficient demolding behavior leading to irregular processing or high demolding forces, which can lead to deformation of ejected parts
[0005] Furthermore, it has been observed that during extrusion polycarbonate profiles can be affected by fouling and vibrations can occur on the surface, creating issues regarding overall product quality

Method used

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  • Enhanced polycarbonate extrusion grades
  • Enhanced polycarbonate extrusion grades
  • Enhanced polycarbonate extrusion grades

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0151] High viscosity polycarbonate PC 103R formulated with three different release agents:

[0152] a) Pentaerythritol tetrastearate (PETS), 0.1 wt% to 0.4 wt%.

[0153] b) Glyceryl tristearate (GTS), 0.03% to 0.05% by weight.

[0154] c) Polyalphaolefin (PAO), 0.09 wt% to 0.4 wt%.

[0155] At various times, several batches were produced and sent to the extrusion line and then extruded in the form of multi-wall sheets. Each material was extruded for a minimum of 3 hours. Data on surface vibrations were collected and analyzed.

[0156] result:

[0157] Table 1 shows data for several batches of high viscosity polycarbonate used for multiwall sheet extrusion. Formulations containing a release agent other than tristearin showed surface vibrations, while those containing tristearin did not.

[0158] Table 1 : Results of visual inspection of surface vibrations on extruded profiles.

[0159]

Embodiment 2

[0161] High viscosity polycarbonate PC 103R was formulated with five different additive packages including one or more of the mold release agents, UV stabilizers, and heat stabilizers listed below.

[0162] Release agent:

[0163] a) Pentaerythritol tetrastearate, 0.2 wt% to 0.4 wt%.

[0164] b) Glyceryl tristearate, 0.03 wt% to 0.05 wt%.

[0165] UV stabilizer

[0166] a) UV 1-2-[2-Hydroxy-3,5-bis(1,1-dimethylbenzylphenyl)]-2H-benzotriazole, 0.2 wt% to 0.3 wt%.

[0167] b) UV2-2,2'-methylenebis(6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol), 0.1 wt% to 0.18 wt%.

[0168] c) UV3-Pentaerythritol tetrakis(diphenyl 2-cyano-3,3-acrylate), 0.1 wt% to 0.18 wt%.

[0169] Heat stabilizer: tris(2,4-di-tert-butylphenyl)phosphite (HS), 0.0075wt% to 0.03wt%.

[0170] The resulting material is sent to an extrusion line and then used as a capping layer on a multi-wall sheet (top and bottom). Each run lasted over 10 hours and the line settings were kept constant during t...

Embodiment 3

[0176] Table 3: Composition of test grades

[0177]

[0178] UV5411 is 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)-phenol (CYASORB TM 5411). Tin360 is a commercially available UV absorber.

[0179] The formulations of Table 3 were tested and the results are listed in Table 4 below. Fouling is the migration of material out of the polycarbonate body during processing and, as a result, deposits form on the surface of the extrusion profile and / or die orifice.

[0180] Buildup was determined by measuring the weight of the die after 8000 injections, cleaning the die, and washing deposits from the die surface. After cleaning, the die weight is measured again and the weight of the fouling or deposit is equal to the weight before cleaning minus the weight after cleaning. Fouling was determined using samples containing less than or equal to 200 ppm water.

[0181] Table 4: Composition data of standard PC103R with PETS+UV5411 versus reformulated PC103R with GTS and Tin36...

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Abstract

The present disclosure relates to thermoplastic compositions, methods of making thermoplastic compositions, and articles made from thermoplastic compositions. The disclosed compositions comprise a polycarbonate polymer and a triacylglyceride release agent. In an embodiment, a thermoplastic composition comprising: a melt polycarbonate polymer; and 0.01 to 0.05 weight percent of a release agent based on the total weight of the composition, wherein the release agent comprises triacylglyceride, and wherein the composition is free of stearyl stearate, glycerol monostearate, and pentaerythrityl tetrastearate.

Description

Background technique [0001] Considering the balance of good properties of polycarbonate such as practical impact resistance, glass-like clarity, and moldability, it can be used in a wide variety of applications. In injection molding applications, effective mold release is a key property that enables efficient processing into shaped articles. Therefore, lower ejection forces are desirable during ejection of the part. Lower release forces can be achieved by adding a release agent to the thermoplastic composition. Mold release agents also help provide consistent processability. [0002] Several materials (like polyester) have desirable mold release properties. However, these materials have poor mechanical properties such as impact properties compared to polycarbonate polymers. Additionally, these materials are difficult to process because they have limited thermoformability for sheet applications and / or insufficient melt flow for injection molded parts. [0003] A suitable r...

Claims

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Application Information

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IPC IPC(8): C08K5/103C08L69/00
CPCC08K5/103C08K5/005C08K2201/019C08L69/00C08K5/11C08K5/315C08K5/3475
Inventor 马尔科·龙卡利亚伊格纳西奥·维克·费尔南德斯赖莫·莫勒斯·法贝尔克里斯蒂安纳斯·约翰内斯·雅各布斯·马斯科内利斯·扬·玛丽亚·赖肯
Owner SABIC GLOBAL TECH BV
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