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Method for compounding polymer pellets with functional additives

A technology of mixtures and additives, applied in the field of mixtures of cellulose and functional additives, can solve problems such as cellulose ester form destruction

Inactive Publication Date: 2008-05-21
EASTMAN CHEM CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the melt compounding of the functional additive solvent into the cellulose ester also has the disadvantage that the morphology of the cellulose ester is destroyed and the mixed product has to be redeposited or secondary extruded to obtain a convenient form (e.g. pellets)

Method used

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  • Method for compounding polymer pellets with functional additives

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Impregnation of plasticizers and stabilizers in pellets

[0083] Cellulose triacetate ("CTA", CA-436-80 from Eastman Chemical Company) (300 g) was mixed with acetone (300 g) and diethyl phthalate (DEP) (150 g) containing 1% t-butylphenol Mix in a 32 oz glass bottle. The bottle was rotated for 16 hours during which time all the liquid had been drawn into the cellulose triacetate pellets and the pellets had swollen and filled the bottle. Pellets were poured into shallow pans and allowed to air dry at room temperature for 78 hours. Weigh dry pellets to 446g. This gave pellets with a theoretical plasticizer content of 32.8% plasticizer. The dry pellets were free flowing and similar in shape to the original pellets, but slightly larger in size and slightly more irregular in shape. Plasticizer analysis of the pellets yielded 32.36% DEP and 0.17% tert-butylphenol. This indicates that both plasticizer and stabilizer have been impregnated into the pellets.

Embodiment 2

[0085] Impregnation of plasticizers in pellets

[0086] Cellulose triacetate (CA-436-80 from Eastman Chemical Company) (440 g) was mixed with acetone (450 g) and triphenyl phosphate (60 g) in a 32 oz glass bottle. The bottle was rotated for 24 hours during which time all the liquid had been drawn into the cellulose triacetate pellets and the pellets had swollen and filled the bottle. The pellets were then poured into shallow pans and air dried at room temperature followed by drying in a forced air oven at 60°C for 6 hours. The dry pellets were weighed at 506 g, which is consistent with the target 12% plasticizer content. The dry pellets were free flowing and similar in shape to the original pellets, but slightly larger in size and slightly more irregular in shape.

Embodiment 3

[0088] Impregnation of UV stabilizers in pellets

[0089] Cellulose triacetate (CA-436-80, from Eastman Chemical Company) (200 g) was mixed with 200 g of acetone and 1.0 g of Tinuvin7 292 (UV stabilizer, obtained from Ciba) and 1.0 g of Tinuvin7 1130 (UV absorber, obtained from Ciba ) in a 32 oz glass jar. The bottle was rotated for 15 hours during which time all the liquid was absorbed into the cellulose triacetate pellets and the pellets increased in size significantly. The free-flowing pellets were poured into shallow pans and allowed to air dry at room temperature for 78 hours.

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Abstract

New methods of forming compounded cellulose esters are provided. The methods comprise mixing a cellulose ester, functional additive, and a swelling agent and subsequently removing at least a portion of the swelling agent. The swelling agent is one that assists in causing the functional additive to penetrate into the cellulose ester, while not acting significantly as a solvent for the cellulose ester. Preferred cellulose esters include, but are not limited to, cellulose acetates, cellulose triacetates, cellulose acetate phthalates, and cellulose acetate butyrates. The functional additive can be a plasticizer, stabilizer, or other additive selected to modify a particular property of the cellulose.

Description

field of invention [0001] The present invention relates broadly to novel methods of forming mixtures of cellulose and functional additives useful for forming articles such as films, fibers and sustained release matrices. Background technique [0002] Cellulose can be esterified with various aliphatic and aromatic carboxylic acids. The most typical cellulose esters are acetate, propionate, cellulose butyrate, and mixed esters such as cellulose acetate propionate and cellulose acetate butyrate. Cellulose esters and methods for their manufacture are reviewed by Gedon et al., "Cellulose Esters", Kirk-Othmer Encyclopedia of Chemical Technology, Fourth Edition, Volume 5, John Wiley & Sons, New York, 496-529 (1993), incorporated herein by reference the literature. The manufacture of cellulose esters is also described by Steinmeier in Macromolecular Symposia (2004), 208 (cellulose acetate), 49-60, which is hereby incorporated by reference. Methods of making cellulose are also des...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/00C08K5/00C08B3/30C08J3/205C08L1/10C08L1/12C08L1/14
CPCB29K2001/12
Inventor D·廷达尔
Owner EASTMAN CHEM CO
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