Abstract:
A method for increasing the crystallization rate of a crystallization polyester comprises incorporating into the polyester an effective amount of a hyperfunctional nucleation agent. The hyperfunctional nucleating agent comprises a plurality of functional groups and form stable nuclei around which the polyester crystallizes. The hyperfunctional nucleating agent facilitates faster crystallization and formation of many small crystallites. Methods of making articles such as containers with polyesters are also disclosed.
Abstract:
The present invention relates to a process for removing contaminants, which comprises removing contaminants from a contaminant-containing polyester material at a temperature of at least 150.degree. C. in the presence of an equilibrium amount of a polyester reversible side-product.
Abstract:
A process for preparing a polyester having an inherent viscosity of at least 0.5 comprising(A) preparing an admixture of a molten polyester having an inherent viscosity of less than 0.5, a titanium alkoxide and a 13X zeolite, and(B) subjecting the admixture to a time and temperature sufficient to increase the inherent viscosity of the polyester to at least 0.5.
Abstract:
Disclosed is a process for the co-production of an aromatic carboxylic esters and alkyl iodide by the carbonylation of an aromatic iodide in the absence of a Bronsted base and in the presence of an ether and a nickel catalyst.
Abstract:
A process for preparing a copoly(arylene sulfide) corresponding to the structure[(--A--S--).sub.1-x (--A--S--S--).sub.x ].sub.nwherein x is in the range of 0.5 to 0.001 by reacting a mixture of a diiodoaromatic compound and elemental sulfur in the absence of a basic material and in the presence of a catalytic amount of iron.
Abstract:
A process for the vapor phase iodination of an aromatic compound which involves combusting an alkyl aromatic iodide in the presence of oxygen to produce molecular iodine and feeding the molecular iodine and an aromatic compound to an oxyiodination reaction to iodinate aromatic compounds.
Abstract:
A process for the separation of a mixture of diiodonaphthalene isomers into an adsorbed component and a non-adsorbed component by passing the mixture over a zeolite to obtain an adsorbed zeolite containing the adsorbed component, separating off the non-adsorbed component and eluting the adsorbed zeolite with a desorbent to obtain the adsorbed component.
Abstract:
A process for preparing an aromatic carboxylic ester and an alkyl iodide by carbonylating an aromatic iodide in the presence of an ether, a catalytic amount of a transition metal and a strong acid promoter.
Abstract:
Disclosed is a process for iodinating an aromatic compound over a zeolite catalyst containing a deactivation modifier selected from the group consisting of ions or salts of hydrogen, copper, zinc, cadmium, silver and mercury.