摘要:
This invention relates to optionally branched polyarylene sulphides and a process for the production thereof in a polar solvent, from 0.2 to 100 mole %, based on the aromatic dihalogen compounds, of an amino acid being added to the reaction mixture.
摘要:
This invention relates to optionally branched polyarylene sulphides and a process for the production thereof in a polar solvent, from 0.2 to 100 mole %, based on the aromatic dihalogen compounds, of an amino acid being added to the reaction mixture.
摘要:
This invention relates to a process for the production of high molecular weight, optionally branched polyarylene sulphides from alkali metal sulphides and halogenated aromatic compounds in the presence of from 0.5 to 100 mol %, based on the molar quantity of aromatic dihalogen compounds, of an ester or anhydride of a carboxylic acid.
摘要:
A process for removing onium salts from aqueous solutions comprising adding a phenolic compound to an onium salt containing aqueous solution, contacting the solution with a water-immiscible organic material whereby the onium salt migrates into the water-immiscible organic material and separating the aqueous hase from the onium salt in the water-immiscible organic material.
摘要:
The invention relates to a process for the production of high molecular weight, optionally branched polyarylene sulfides from alkali sulfides and aromatic dihalogen compounds, in which the reaction is carried out in a polar solvent, such as an N-alkyl lactam, containing from 0.5 to 100 mole %, based on the moles of aromatic dihalogen compound, of a lactam.
摘要:
The present invention relates to a process for the production of high molecular weight, optionally branched polyarylene sulphides. These can be produced in a polar organic solvent in the absence of water in a reaction vessel cascade comprising from two to six reaction vessels.
摘要:
Process for preparing polyarylensulfides by reacting dihalogenobenzenes, optionally substituted with polyhalogenoaromatic compounds with 3 or 4 halogeno substituents, and alkali metal sulfide in polar solvents using alkali metal sulfites and/or alkaline earth metal sulfites as catalysts.
摘要:
The invention relates to readily processible polyamide molding compounds which have very good mechanical and electrical properties as well as high surface quality and are based on polyamide, magnesium hydroxide and polyhydroxy compounds of the Novolak type.
摘要:
The invention relates to a process for the production of caprolactam by thermal depolymerization of polyamide in the presence of small quantities of potassium carbonate at 250.degree. to 320.degree. C. and to a process for purifying the resulting caprolactam.
摘要:
The present invention relates to easily processable polyamide moulding materials with very good mechanical and electrical properties based on calcium magnesium carbonate hydrate as the flame-retardant additive.