摘要:
A mixture comprising at least one polyfunctional chain extender having at least three reactive groups, and at least one mono- or difunctional hydrolysis stabilizer, where the chain extenders and the hydrolysis stabilizers react with the terminal groups of polymers in the molten or solid state of the polymers to form a chemical bond. Use of such mixtures as stabilizers for polymers. Methods for stabilizing polymers with respect to molecular weight loss, where an effective amount of such a mixture is added to the polymer.
摘要:
Co-polyester resin compositions and processes for manufacturing resin compositions are provided, said resin compositions being suitable for extrusion blow molding for the manufacture of containers with good color, clarity for both food, non-food applications and other applications such as profile extrusions and manufacture of blown films which require high melt strength polyester.
摘要:
The present invention relates to a polymer (P1) obtainable by reaction of at least one component a) with at least one component b), wherein a) is at least one polyolefin (A), which is grafted with at least one compound (G), and b) is at least one compound (B) containing at least two epoxy groups.
摘要:
This invention relates to a process for stabilizing polymers with oligomeric carbodiimides containing at least one heterocyclic end group and stabilizers. The oligomeric carbodiimides may be compounds of the general formula (I): where A1, A2 are each independently, identically or differently, hydrocarbon groups having 2 to 20 carbon atoms, B1, B2 are each independently, identically or differently, heterocycles, C1-C30-alcohols, polyetherols, polyesterols, amines, polyether amines, polyester amines, thioalcohols, polyether thiols, polyester thiols; R1, R2 are each independently, identically or differently: n is an integer from 2 to 100, and A1, A2, B1 and B2 may each be substituted at any desired position by C1-C20-alkyl, C2-C20-alkenyl, C2-C20-alkynyl, C1-C20-alkoxy, carbonyl oxygen (═O) or halogen, with the proviso that at least one B1 or B2 substituent is a heterocyclic end group. The invention also relates to compositions of the oligomeric carbodiimides and mixtures.
摘要:
The present invention relates to a process for increasing the molecular weight of polyesters via heating, to from 160 to 350° C., in an extruder, of 100 parts of polyester with i) from 0.01 to 5 parts of a tetracarboxylic dianhydride and ii) from 0.01 to 5 parts of a copolymer which contains epoxy groups and which is based on styrene, acrylate, and/or methacrylate.
摘要:
The present invention relates to an improved pultrusion process for producing semifinished products based on polymers, in particular polyesters or polyamides, which comprises adding reactive chain extenders during the process of saturation (impregnation) of the fibers.
摘要:
Solid dispersions of thermoplastic polymers and a crosslinked water-insoluble polymer, which solid dispersions are suitable as filter aids, wherein the solid dispersions comprise 20 to 95% by weight of at least one thermoplastic polymer (component A) and 5 to 80% by weight of at least one crosslinked water-insoluble polymer selected from the group consisting of homopolymers of N-vinylformamide, N-vinylcaprolactam, N-vinylpiperidone, N-vinylpyridines, N-vinylimidazoles, styrene monomers, acrylates and methacrylates and also copolymers of basic N-vinyl compounds, styrene monomers, acrylates and methacrylates (component B).
摘要:
Oligomeric carbodiimides comprising at least one heterocyclic end group are used as stabilizers for polymers. The oligomeric carbodiimides may be compounds of the general formula (I), where A1, A2 are each independently, identically or differently, hydrocarbon groups having 2 to 20 carbon atoms, B1, B2 are each independently, identically or differently, heterocycles, C1-C30-alcohols, polyetherols, polyesterols, amines, polyether amines, polyester amines, thioalcohols, polyether thiols, polyester thiols, R1, R2 are each independently, identically or differently, n is an integer from 2 to 100, and wherein A1, A2, B1 and B2 may each be substituted at any desired position by C1-C20-alkyl, C2-C20-alkenyl, C2-C20-alkynyl, C1-C20-alkoxy, carbonyl oxygen (═O) or halogen, with the proviso that at least one B1 or B2 substituent is a heterocyclic end group. Processes for stabilizing polymers against hydrolysis using oligomeric carbodiimides are also disclosed.
摘要:
The thermoplastic molding composition comprises a) as component A, from 3 to 79% by weight of one or more styrene copolymers which have no units derived from maleic anhydride, b) as component B, from 15 to 91% by weight of one or more polyamides having, based on the entire component B, from 0.1 to 0.2% by weight of triacetonediamine (TAD) end groups, c) as component C, from 5 to 50% by weight of one or more impact-modifying rubbers, d) as component D, from 1 to 25% by weight of a styrene copolymer which, based on the entire component D, has from 1.9 to 2.3% by weight of units derived from maleic anhydride, e) as component E, from 0 to 40% by weight of further rubbers, f) as component F, from 0 to 50% by weight of one or more fibrous or particulate fillers, g) as component G, from 0 to 40% by weight of further additives, where the molding composition comprises less than 0.1% by weight of phthalic anhydride and the total amount of components A to D and, if appropriate, E to G is 100% by weight.
摘要:
Process for production of polymer blends which are suitable as filter aids and are composed of polystyrene and of crosslinked water-insoluble polyvinylpyrrolidones via processing of the two components in an extruder, which comprises melting polystyrene in an extruder and then treating it with the polyvinylpyrrolidone, and adding, to the mixture of the components, from 0.1 to 10% by weight of water, based on the total amount of polystyrene and popcorn polymer, and extruding and comminuting the mixture.