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Stabilized polymer compositions and methods of making same

A polymer and composition technology, applied in the field of stable polymer composition and its preparation

Active Publication Date: 2015-12-30
BAERLOCHER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Unfortunately, many commercially available phosphorus antioxidants such as bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, bis(2,4-dicumylphenyl)pentaerythritol diphosphite , Distearyl Pentaerythritol Diphosphite, (CAS#87498-44-0, CAS#154862-43-8, CAS#38613-77-3, CAS119345-01-6, CAS#3806-34-6) , also suffers from similar deficiencies

Method used

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  • Stabilized polymer compositions and methods of making same

Examples

Experimental program
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Embodiment approach

[0066] According to one embodiment of the invention the stabilized polypropylene composition has a YI after 5 passes of less than -1.

[0067] According to one embodiment of the invention, the YI of the stable LLDPE composition after one pass is less than -4.

[0068] According to one embodiment of the invention, the stable LLDPE composition has a YI of less than 5 after 3 passages.

[0069] According to one embodiment of the invention, the stable LLDPE composition has a YI of less than 6 after 5 passages.

[0070] According to one embodiment of the invention, the stable LLDPE composition has a YI after the gasfade test (fume chamber, 55°C, 4 days) of less than 1.6.

[0071] According to one embodiment of the present invention, the whiteness index of the stable LLDPE composition is at least 27 and meets at least one of the following conditions: YI is less than -4 after one pass, YI is less than 5 after 3 passes, YI is less than 5 after 5 passes Less than 6 after passage, YI ...

Embodiment 1

[0149] Production of premixes of (a) antacids and (b) organic acid metal salts for the Examples provided in Tables 1 and 2 is described as follows. The components to produce a premix according to an embodiment of the invention are presented in the order in which they are added.

[0150] Premix 1 was prepared by dispersing 135.4g of zinc oxide (French Process, >99.7% purity) in 892.1g of fatty acid (acid number 209) in a Parr reactor, adding 0.3g of adipic acid catalyst and dissolving in the reaction In the mixture, heat the reaction mixture to the induction temperature of the reaction and mix and react the mixture at a pressure of 35 psig for 20 min. The reaction vessel is vented to atmospheric pressure while maintaining the temperature above the melting point of the resulting organic acid metal salt reaction product and finally at 130° C. 250 g of zinc oxide (French method, >99.7% purity) were intimately mixed at -150°C to produce a premix stabilizing component. The melt dis...

Embodiment 2

[0155] Table 1: Low Linear Density Polyethylene (LLDPE) Compositions

[0156]

[0157] Entry 1: No Additives

[0158] Item 2: Controls

[0159] 1076: Octadecyl 3,5-di-tert-butyl-4-hydroxyhydrocinnamate

[0160] TNPP: Tris(nonylphenyl)phosphite

[0161] Entry 1 of Table 1 is an unstabilized LLDPE resin containing about 20-30 ppm residual chlorine. For entries 2-8, stabilized mixtures obtained by tumble blending stabilizer additives into LLDPE in a Henschel mixer were processed for testing. Granulation was simulated by performing a zero channel run at 190°C with a nitrogen purge. Using KrausMaffeiBerstorffZE25Ax26D at 225°C without nitrogen purge The twin-screw extruder implements 5-pass extrusion and the melt flow rate (MFR) and yellowness index (YI) are measured after the first, third and fifth passes. Yellowness Index (YI) was determined on a HunterLab ColorQuest XE Colorimeter and Melt Flow Rate (MFR) was determined on a Tinius Olsen Extrusion Plastometer.

[01...

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Abstract

The invention relates to stabilizer compositions for polymers such as polyolefin polymers, which decrease a phosphorus based stabilizer content necessary to stabilize the polymer. The premixed stabilizer compositions include an antacid, an organic acid-metal salt, and a primary antioxidant such as a sterically-hindered phenolic compound, a sterically-hindered amine compound, a hydroxylamine compound, and combinations thereof. The premixed stabilizer may further include a portion of the phosphorus based stabilizer content necessary to stabilize the polymer. The invention also relates to a method for the preparation of the stabilized polymer compositions provided by the use thereof.

Description

[0001] References to related applications [0002] Pursuant to 37 C.F.R. §1.78(a)(4), this application claims the benefit and priority of previously filed co-pending Provisional Application No. 61 / 789,731, filed March 15, 2013, the entire contents of which are incorporated by reference expressly incorporated herein. technical field [0003] The present invention relates generally to stabilized polymer compositions and methods of making the same, and more particularly to stabilizer compositions that reduce or eliminate the need to use phosphorus-based stabilizers. Background technique [0004] A major challenge with the processing and storage of most polymers, especially polyolefin polymers, styrenic polymers, and poly(meth)acrylate polymers, is the susceptibility of the polymer to undergo oxidative degradation. Polymer compounds, eg polyolefins like polyethylene and polypropylene, are subject to free radical driven degradation processes especially during processing steps at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/00C08K5/098C08K3/00
CPCC08K3/22C08K5/005C08K5/098C08K5/134C08K5/52C08K3/01C08K2003/2296
Inventor 史蒂文·R·托尔基亚里希·赫德森塔蒂亚娜·罗曼诺瓦
Owner BAERLOCHER
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