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KR-102962323-B1 - POLYMER COMPOSITION COMPRISING BASIC ADDITIVE, PROCESS AND ARTICLES COMPRISING SAID POLYMER COMPOSITION

KR102962323B1KR 102962323 B1KR102962323 B1KR 102962323B1KR-102962323-B1

Abstract

The present invention relates to a polymer composition comprising at least one basic additive, and a method comprising at least one process step for obtaining the polymer composition or an article comprising the polymer composition. The polymer composition generally exhibits enhanced biodegradability.

Inventors

  • 횔터, 디르크
  • 라페르조네, 필리페

Assignees

  • 솔베이 아세토우 게엠베하

Dates

Publication Date
20260508
Application Date
20151210
Priority Date
20141211

Claims (15)

  1. A polymer composition comprising at least one polymer and at least one basic additive, wherein the at least one basic additive has a pH of 13 or less and 7 or more when measured in a 1% by weight solution in water at 20°C, and the at least one basic additive is selected from the group consisting of alkaline earth metal oxides, alkaline earth metal hydroxides, alkaline earth metal carbonates, ZnO, and basic Al₂O₃ , and all polymers in the polymer composition are selected from the group consisting of cellulose acetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate, and cellulose acetate butyrate.
  2. A polymer composition according to claim 1, wherein at least one basic additive is selected from the group consisting of alkaline earth metal oxides, ZnO , and basic Al₂O₃ .
  3. In claim 1, the at least one basic additive is 10⁻⁶ per 100 mL of water at 20°C. A polymer composition having a solubility of g to 70 g.
  4. A polymer composition according to claim 1, wherein at least one basic additive is selected from the group consisting of MgO, Mg(OH) ₂ , MgCO₃ , CaCO₃ , CaO, Ca(OH) ₂ , and ZnO.
  5. A polymer composition according to claim 1, wherein at least one basic additive is MgO.
  6. A polymer composition according to claim 1, wherein at least one basic additive is present in the polymer composition in the form of finely distributed particles, and the D90 particle size is 10 μm or less.
  7. A polymer composition according to claim 1, wherein the at least one basic additive is present in the polymer composition in an amount of 0.01 weight% to 40 weight% in the form of finely distributed particles.
  8. A polymer composition according to claim 1, wherein the polymer composition further comprises at least one inhibitor of an autocondensation reaction occurring in a solvent, having at least one carbonyl functional group and a C-H bond at an α-position relative to the carbonyl functional group.
  9. A polymer composition according to claim 8, wherein at least one inhibitor is selected from the group consisting of carboxylic acids and alcohols.
  10. A polymer composition according to claim 9, wherein at least one inhibitor is selected from the group consisting of citric acid, lactic acid, malic acid, and tartaric acid.
  11. A polymer composition according to claim 8, wherein the at least one inhibitor is present in the polymer composition in an amount of 0.001 weight% to 10 weight%.
  12. A method for manufacturing a polymer composition according to any one of claims 1 to 11, a) contacting at least one basic additive and optionally at least one inhibitor with at least one polymer in a liquid phase containing at least one solvent, and subsequently separating at least one solvent to obtain a polymer composition according to any one of claims 1 to 11, and d) contacting at least one basic additive with at least one polymer in which at least a portion is in a molten state, and optionally cooling the mixture to obtain a polymer composition according to any one of claims 1 to 11. It includes at least one step selected from steps including, A method in which at least one polymer and at least one basic additive are defined in claim 1.
  13. A method for manufacturing an article comprising a polymer composition according to any one of claims 1 to 11, b) a step of contacting at least one basic additive and optionally at least one inhibitor with at least one polymer in a liquid phase containing at least one solvent, and subsequently spinning the resulting mixture to obtain a fiber containing a polymer composition, c) contacting at least one basic additive and optionally at least one inhibitor with at least one polymer in a liquid phase containing at least one solvent, and subsequently processing the resulting mixture into a film forming process to obtain a film comprising a polymer composition, and e) contacting at least one basic additive with at least one polymer in which at least a portion is in a molten state, and subsequently extruding and/or film-blowing the mixture to obtain a molded part, fiber, film, injection-molded article, granule, or vessel comprising the polymer composition. It includes at least one step selected from steps including, A method in which at least one polymer and at least one basic additive are defined in claim 1.
  14. A filter tow comprising a polymer composition according to any one of claims 1 to 11.
  15. A filter tow comprising fibers manufactured by a method comprising at least one step b) according to paragraph 13.

Description

Polymer composition comprising a basic additive, method, and articles comprising said polymer composition This application claims priority to European application EP 14197348.7, the entire contents of which are incorporated herein by reference for all purposes. The present invention relates to a polymer composition comprising at least one basic additive, and a method comprising at least one process step for obtaining the polymer composition or an article comprising the polymer composition. Articles containing polymer compositions are ubiquitous. Often, articles containing polymer compositions have a short life cycle and are discarded after use; examples of such articles include packaging materials, bonding materials, and cigarette filters. Environmental pollution resulting from improper disposal has been a challenge. To reduce the retention time of polymer contaminants in the environment, it is desirable to provide polymer compositions with enhanced biodegradability. It is even more desirable to reduce the retention time of polymer contaminants in landfills by improving the biodegradability of polymer compositions. WO9410238 discloses a method for increasing the biodegradability of cellulose esters by contacting the cellulose esters with a specific basic hydrolysis promoter. Polymer compositions containing at least one basic additive (wherein the at least one basic additive has a pH of 13 or less and 7 or more when measured in a 1 wt% solution in water at 20°C) have been found to exhibit improved biodegradability compared to polymer compositions not containing at least one additive. This effect is particularly advantageous in polymer compositions containing a basic additive with low solubility. The at least one additive is believed to create a favorable habitat for degrading microbes rather than acting as a hydrolysis promoter; the low solubility is advantageous because the additive leaches slowly from the polymer composition, avoiding excessively basic conditions that are potentially harmful to degrading microbes. Furthermore, the slow leaching of the basic additive with low solubility provides a longer and more stable release of the additive; accordingly, this effect can be maintained for an extended period of time. The following examples illustrate the invention but are not intended to limit the scope of the invention. Example 1 - Degradability of cast film Films were prepared by dissolving cellulose acetate DS 2.45 in acetone and adding basic additives and optionally inhibitors. The resulting mixture underwent a film casting procedure using an automated film applicator. In accordance with EN ISO 11721-1, the films were dried, cut into pieces (6.5 cm x 6.5 cm), mounted in frames, and buried in soil. After one month and two months, the specimens were retrieved from the soil, carefully cleaned of coarse deposits, and their weights were checked and the area of loss visually assessed. Each recorded weight loss and area of loss were individually averaged from six films and represented for the portion of the film in contact with the soil. Film A: 15 parts cellulose acetate and 85 parts acetone (Comparative Example) Film B: 15 parts cellulose acetate, 85 parts acetone, 0.79 parts MgO (consequently, 5 wt% MgO in the final product) Film C: 15 parts cellulose acetate, 85 parts acetone, 0.38 parts MgO (consequently, 2.5 wt% MgO in the final product) Film D: 15 parts cellulose acetate, 85 parts acetone, 0.79 parts MgO (consequently, 5 wt% MgO in the final product) and 0.08 parts citric acid (consequently, 0.5 wt% citric acid in the final product) Degradability as determined by EN ISO 11721-1.filmMgO (weight%)Citric acid (weight%)Average weight loss (%)Average lost area (%)1 month2 months1 month2 monthsA000000B5013292949C2.503161228D50.516263245 Example 2 - Degradability of spun fibers A spinning solution was prepared by mixing cellulose acetate (DS 2.45) and acetone, and spun into 1.9 denier filaments with a Y cross-section using a dry spinning method. The filaments were milled and subjected to an aerobic biodegradation test in water according to ISO 14851. The biodegradation rate was determined by measuring O2 consumption. Filament A (Comparative Example): A spinning solution of 26.9 parts cellulose acetate and 0.1 parts TiO2 in 73 parts acetone. Filament B: Spinning solution of 25.6 parts cellulose acetate, 1.35 parts MgO (consequently 5 wt% in the final product), 0.07 parts citric acid (consequently 0.25 wt% in the final product) and 0.1 parts TiO2 in 73 parts acetone. Resolvability as determined by ISO 14851.filamentMgO (weight%)Citric acid (weight%)Biodegradation rate (%) after 28 daysBiodegradation rate (%) after 56 daysA00812B50.256087