Abstract:
The invention provides a method for the production of a pigment preparation for coloring linear polyesters in the melt, which comprises forming a concentrate from 20 to 80 parts of pigment and 80 to 20 parts of a polyester which melts between 60.degree. and 160.degree. C., by kneading in the presence of a salt and a solvent or by a flush process, mixing said concentrate with a fibre forming linear polyester, melting the mixture and processing it to granules. The invention also provides the pigment preparation obtained by the process and the linear polyesters colored therewith.
Abstract:
Thermoplastic copolyesters which have a minimum relative viscosity of 1.7 and contain (a) 35-47.5 mol % of units of terephthalic acid, (b) 15-2.5 mol % of units of isophthalic acid, (c) 10-30 mol % of units of ethylene glycol and (d) 40-20 mol % of units of diethylene glycol, it being possible for up to 9 mol % of the units of ethylene glycol to be replaced by units of a bisphenol dihydroxyalkyl ether, are very suitable as hot-melt adhesives.
Abstract:
The reaction for the manufacture of linear polyesters by polycondensing dicarboxylic acids, hydroxycarboxylic acids or the esters and diols thereof is speeded up by the addition of 1 to 25% by weight of esters of phosphoric and/or phosphorous acid.
Abstract:
Phosphonic acids are suitable catalysts for the transesterification of alkyl esters of carboxylic acids with aliphatic or cycloaliphatic diols containing more than 3 carbon atoms.
Abstract:
Dicarboxylic acids containing at least two triazine rings are very suitable for producing thermoplastic polyesters having high glass transition temperatures and high dimensional stability under heat, and at the same time good processing characteristics.
Abstract:
Polyester precondensates are catalytically polycondensed in solid phase at a constant temperature with a linear increase (during polycondensation) in intrinsic viscosity. The linear increase makes possible an accurate advance determination of reaction time required to produce thermoplastic polycondensate of the desired intrinsic viscosity.
Abstract:
Dicarboxylic acids and dicarboxylic acid derivatives which contain N,N-imidazolidine-4,5-diones are useful monomers for the manufacture of polymers, in particular polyesters.
Abstract:
Flame-resistant plastics moulding material formed from a polymer, preferably a thermoplast, and a halogenated benzimidazolone or halogenated benzimidazolone derivative, such as N,N'-di-(2-hydroxyethyl)-4,5,6,7-tetrabromobenzimidazolone or 4,5,6,7-tetrabromobenzimidazolone calcium, as a flame-resistant agent. The flame-resistant agent is added to the polymer at any suitable stage of production by a simple mixing together of the constituents, whereby this flame-resistant agent must not react chemically with the polymer.
Abstract:
Linear thermoplastic polyesters obtained from aromatic dicarboxylic acids and unsubstituted aromatic diols are modified with relatively long chain aliphatic dicarboxylic acids. By this means, the processing temperatures are lowered, while the mechanical properties remain essentially unchanged.
Abstract:
Linear thermoplastic polyesters containing, in the main, triazinedicarboxylic acids as the acid constituent are modified with relatively long-chain aliphatic dicarboxylic acids. By this means, the processability is improved and the notched impact strength is increased, without other mechanical properties being substantially changed.