Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
  • C08L3/04—Starch derivatives, e.g. crosslinked derivatives
  • C08L3/08—Ethers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
  • C08B31/00—Preparation of derivatives of starch
  • C08B31/08—Ethers
  • C08B31/12—Ethers having alkyl or cycloalkyl radicals substituted by heteroatoms, e.g. hydroxyalkyl or carboxyalkyl starch
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
  • C08K5/0016—Plasticisers

Definitions

• starch in particular from the linear component of the starch, the amylsis, films and thermoplastic molded parts can be produced.
• modified starches in particular special starch ethers, can be used to produce films and moldings which often have improved performance properties. For example, Manufacture more flexible films and molded parts from starch ethers. This is based on solid, isolated starch ethers.
• Starch ethers are formally reaction products between hydroxyl groups of the glucose units of the starch molecules and alcoholic hydroxyl groups of other compounds. Moldings made from hydroxyethyl and hydroxypropyl starch ethers are particularly suitable for the production of flexible films.
• Hydroxyethyl or hydroxypropyl groups are introduced into the starch molecule by the action of the corresponding alkylene oxides on starch in aqueous alkali; chlorohydrins, e.g. Ethylene chlorohydrin and epichlorohydrin.
• chlorohydrins e.g. Ethylene chlorohydrin and epichlorohydrin.
• the conditions for producing oxyethylated starches are outlined in numerous patents, but precise details are rarely disclosed.
• the introduction of hydroxyethyl and propyl groups into the starch molecule has a major impact on the gelatinization properties of the starches.
• the paste shows greater clarity, and the retrogradation tendency in cooling and aging is much less than in the initial thicknesses.
• Another way to change the material properties is to use suitable additives.
• the number of positively tested additives is limited. Polyols such as e.g. Glycol and glycerin used.
• the invention follows the path of achieving degradable and environmentally compatible materials with a high utility value by combining starch etherification and additive addition.
• Oxethylated compounds, in particular citric acid have proven to be particularly advantageous as additives, and amylose and amylose starches have proven to be particularly suitable starches.
• mixtures of starch and citric acid can be reacted chemically with the corresponding epoxides, in particular ethylene oxide, advantageously in a one-pot reaction, provided that suitable reaction conditions are met, and with little effort, and thus obtain base materials for film and molded part production.
• base materials can be produced which, even with a low degree of oxyethylation, have good usage properties.
• the low degree of oxyethylation also means that the starch weight fraction and the citric acid weight fraction of the base materials are particularly high, and products can thus be produced from hardly modified natural products. This is because epoxies are the more expensive raw material components compared to starch and citric acid From this point of view, the method according to the invention is also considerably superior to the prior art.
• films made from a low-substituted hydroxyethyl starch (degree of substitution approx. 0.1-0.3) and 10% citric acid-ethylene oxide adduct as a plasticizer additive are much harder, hardly flexible and sometimes even brittle, as clear and transparent.
• Amylose (0.05 M) is reacted with a factor of the theoretically necessary amount of ethylene oxide (0.4 M) according to the known procedure and analogously to Example 1.
• the isolated starch product then has a relatively high degree of oxethylation of approximately 1. Films made from this matrix are soft, flexible and stretchy, but not sticky like comparatively film 1.

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• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Biochemistry (AREA)
• Materials Engineering (AREA)
• Polysaccharides And Polysaccharide Derivatives (AREA)
• Manufacture Of Macromolecular Shaped Articles (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Biological Depolymerization Polymers (AREA)

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• 1989
  • 1989-06-23 DE DE3920621A patent/DE3920621A1/de active Granted
• 1990
  • 1990-06-21 CA CA002019570A patent/CA2019570A1/en not_active Abandoned
  • 1990-06-22 JP JP2509186A patent/JPH04502344A/ja active Pending
  • 1990-06-22 US US07/654,621 patent/US5128461A/en not_active Expired - Fee Related
  • 1990-06-22 EP EP90909721A patent/EP0438548A1/de not_active Withdrawn
  • 1990-06-22 WO PCT/EP1990/000998 patent/WO1991000313A1/de not_active Ceased

Non-Patent Citations (1)

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