摘要:
The present invention relates to mixtures of cyclic oligocarbonates, to their production by way of mixtures of bischloroformates, and to their use for the production of linear polycarbonates and for the modification of other linear polycarbonates.
摘要:
The present invention relates to mixtures of cyclic oligocarbonates, to their production by way of mixtures of bischloroformates, and to their use for the production of linear polycarbonates and for the modification of other linear polycarbonates.
摘要:
A process for the manufacture of cyclic oligocarbonate is disclosed. The process comprises a reaction of a bis-chlorocarbonic acid ester with isatinbisphenol or with a bis-chlorocarbonic ester thereof. The mixture of cyclic oligocarbonates thus prepared is useful as a precursor in the preparation of modified polycarbonate or polyester resins.
摘要:
A process is disclosed whereby a polymeric resin (containing ester and/or carbonate bonds) is readily converted into a resin having a modified molecular structure. Accordingly, a polycyclic carbonate (a monomer or oligomer) is transesterified with the polymer resin in the melt, preferably upon extrusion, optionally in the presence of a catalyst. Significantly, the cyclic carbonates are, by the inventive process, inserted into the structure of the polymer, effecting branching of the molecular structure, a branching which manifests itself in the modified properties of the resin.
摘要:
The invention relates to mixtures of poly(arylene sulphides), glass fibres and maleamidic acids, which are remarkable for good mechanical properties and an increased melt viscosity of the matrix resin.
摘要:
The invention relates to mixtures of polyarylene sulphides, maleimides, glass fibres and if appropriate other additives. The mixtures are distinguished by good mechanical properties.
摘要:
The new aromatic polyethers containing ester groups, which are distinguished by high dimensional stability, may be used for the production of all kinds of moulded products as well as for the preparation of block copolymers of aromatic polyether segments and segments of other thermoplastic polymers.
摘要:
Process for the production of hydrogenated, ring-opened metathesis (co)polymers from cyclic olefins using the ruthenium-carbene complexes of the general formula (I) ##STR1## in which R.sub.1 and R.sub.2 mutually independently mean hydrogen, C.sub.2 -C.sub.20 alkenyl, C.sub.1 -C.sub.20 alkyl, aryl, C.sub.1 -C.sub.20 carboxylate, C.sub.1 -C.sub.20 alkoxy, C.sub.2 -C.sub.20 alkenyloxy, aryloxy, C.sub.2 -C.sub.20 alkoxycarbon-yl,C.sub.1 -C.sub.20 alkylthio, which may optionally be substituted by C.sub.1 -C.sub.5 alkyl, halogen, C.sub.1 -C.sub.5 alkoxy or by phenyl optionally substituted by C.sub.1 -C.sub.5 alkyl, halogen, C.sub.1 -C.sub.5 alkoxy;X.sub.1 and X.sub.2 mutually independently mean any desired anionic ligand;L.sub.1 and L.sub.2 mutually independently mean any desired neutral electron donorand two or three of X.sub.1, X.sub.2, L.sub.1 and L.sub.2 may furthermore together form a multi-dentate chelating ligand,as catalysts for the polymerisation stage, wherein the catalyst is optionally modified after polymerisation by adding a modifier and the polymerisation product is hydrogenated as a solution (optionally diluted with the same inert solvent as during polymerisation or with another inert solvent) without addition of an extra hydrogenation catalyst at temperatures of 0.degree. C. to 200.degree. C. preferably of 35.degree. C. to 150.degree. C. under a hydrogen pressure of 2 to 200 bar, preferably of 10 to 50 bar, wherein at least 60%, preferably at least 95% of the olefinic double bonds are saturated.
摘要:
The use of phenols having a branched structure as terminal groups in polycarbonates, polyester carbonates and polyesters is disclosed. Also disclosed are polycarbonates, polyester carbonates and polyesters having such branched terminal groups, the process for their production and molded parts made therefrom.
摘要:
The present invention is directed to an improved internal mold release system for the production of high density molded SRIM parts, i.e. molded parts having a density of from 1.3 to 2.0 g/cc. In particular, the process involves reacting a reaction mixture comprising an organic polyisocyanate and at least one organic compound containing isocyanate-reactive hydrogens in the presence of a catalyst and an internal mold release agent in a closed mold. The internal mold release agent is a compound corresponding to the formula: ##STR1## wherein R.sup.2 represents hydrogen, the group R.sup.5 --NH--CO--, or a C.sub.1 to C.sub.24 alkyl or substituted alkyl group, a C.sub.3 to C.sub.24 cycloalkyl or substituted cycloalkyl group, a C.sub.2 to C.sub.24 alkenyl or substituted alkenyl group, or a C.sub.6 to C.sub.24 aryl or substituted aryl group, andwherein R.sup.1, R.sup.3, R.sup.4 and R.sup.5 may be the same or different and represent a C.sub.1 to C.sub.24 alkyl or substituted alkyl group, a C.sub.3 to C.sub.24 cycloalkyl or substituted cycloalkyl group, a C.sub.2 to C.sub.24 alkenyl or substituted alkenyl group, or a C.sub.6 to C.sub.24 aryl or substituted aryl group,with the proviso that at least one of R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 is a C.sub.12 to C.sub.24 alkyl or substituted alkyl group, or a C.sub.12 to C.sub.24 alkenyl or substituted alkenyl group, and with the further proviso that substituent groups are inert toward isocyanate groups at temperatures of 100.degree. C. or less.