摘要:
Compounds of the general formula (I) are potent sweeteners, especially 4,1',6'-tribromo-4,1',6'-trideoxygalactosucrose: ##STR1## in which R' represents a chlorine or bromine atom;R.sup.2 and R.sup.3 respectively represent a hydroxy group and a hydrogen atom or a hydrogen atom and a chlorine or bromine atom;R.sup.4 represents a chlorine or bromine atom; at least one of R', R.sup.3 and R.sup.4 representing a bromine atom.
摘要:
The present case relates to a process for the purification of lactide from a crude lactide vapor product stream which process comprises a rectification/condensation step leading to a lactide-enriched condensate.
摘要:
A blend of a multiply branched lactic acid polymer of one steric configuration with a linear lactic acid polymer of the opposite steric configuration has different and more useful properties than either component alone.
摘要:
Poly(lactic acid) blends having a relatively high heat distortion temperature can be prepared by simple blending of PLA polymers of opposite stereoforms, followed by processing, e.g. by injection molding, under specific conditions of temperature and pressure, so as to produce a blend which, on differential scanning calorimetry, exhibits two peaks within the melting range of the stereocomplex. Moreover, by careful selection of these conditions of temperature and pressure, it is possible to use PLA polymers of significantly higher molecular weights than previously thought possible.
摘要:
The present invention describes a polyhydroxycarboxylic acid having bimodal or multimodal molar mass distribution, a process for the preparation thereof, the use of an aromatic diol having a single benzene ring for the preparation of polyhydroxycarboxylic acid, in particular polyhydroxycarboxylic acid having bimodal or multimodal molar mass distribution, as well as a method of preparing injection-molded goods or blown film, polymer blends, composite materials or nanocomposite materials using said polyhdroxycarboxylic acid.
摘要:
The invention is directed to a method for preparing an environmentally degradable polymeric compound as well as to such a compound per se and to its use. A compound of the present invention includes a polycondensated lactic acid containing polymer, having a molecular weight (Mw) of from 500 to 50,000 g/mol, to which a flexibilizing aliphatic polyester having a molecular weight of from 500 to 50,000 g/mol is coupled. The amount of lactic acid including groups in the polymeric compound ranges from 50 to 99% and the amount of flexibilizing polyester groups ranges from 1 to 50%.
摘要:
The invention is directed to a chewing gum, including a gum base and at least one other conventional chewing gum component, said chewing gum including as gum base at least one branched polymer mainly based on biodegradable and/or hydrolyzable ester groups.
摘要:
The present invention relates to novel extractive methods for purifying sucralose. The present invention also relates to compositions comprising the sucralose preparations made by the methods of the present invention.
摘要:
The present invention relates to novel methods for stabilizing aqueous deacylation, via use of buffers in the production of sucralose. The present invention provides a process for producing sucralose from an acyl-sucralose compound whereby the acyl-sucralose compound is deacylated in the presence of a buffering agent, which stabilizes the pH of the feed mixture and decreases the accumulation of undesired anhydro compounds. Further, the present invention provides a process whereby the acyl-sucralose compound is deacylated directly either prior to or after removal of the tertiary amide reaction vehicle from the neutralized chlorination feed mixture. An aqueous solution of sucralose including salts and other compounds is produced, from which sucralose is recovered by extraction and purified by crystallization.