Abstract:
@ Isotactic index improvement is achieved for C 3 and higher alpha olefins in systems containing a catalyst component comprising titanium supported on a magnesium halide support. The titanium component is formed by copulverizing the magnesium halide with one or more eletron donor followed by treatment with liquid titanium halide. The improvement is achieved by using a dialkylaluminum monohalide component with the trialkylaluminum cocatalyst normally used. In non- slurry polymerizatins improvements in both activity and isotactic index have been achieved. In slurry polymerizations, the isotactic index of the polymer has been improved. It is possible to achieve a variable melt flow index for polypropylene while maintaining good isotactic index. Isotactic index is retained at high levels even though the temperature and/or time of polymerization is varied.
Abstract:
A solid phosphorus pentoxide containing material suitable for use in fast-setting cements can be produced by a process which comprises mixing a porous material with a liquid, phosphorus pentoxide containing material and heating the mixture until a dry solid is produced. The solid phosphorus pentoxide containing material thus formed can then be dry blended with a solid component comprising magnesium oxide, magnesium hydroxide, magnesium carbonate or mixtures thereof. An aggregate can optionally be added into this dry blend. The components of the resulting dry blend react in the presence of an aqueous component to form a monolithic solid.
Abstract:
Alpha-halogenated aromatic compounds of the formula: where X is halogen, R is X or hydrogen, R, is hydrogen or C 1 -C 6 alkyl, and n is 1 to 4 have been found to be photoinitiators for monomeric and polymeric compositions of photopolymerizable substances.
Abstract:
Alpha-halogenated aromatic compounds of the formula where X is halogen, e.g., chlorine, R is either X or hydrogen, R, is hydrogen or C 1 -C 6 alkyl, A is eitherX,-C(R) (R,) (X), or-CH 2 R, and n is an integer of 0 to 2, with the proviso that when n is 0 one of either R or R, is X, have been found to be photoinitiators for use in the photopolymerization of monomeric and polymeric compositions of photopolymerizable substances. Combinations of these compounds with benzoin ether, glyoxylate and/or acetophenone photoinitiator compounds give compositions having enhanced activity at reasonable cost.
Abstract:
Alpha-halogenated aromatic compounds of the formula where A is selected from lower alkyl, alkoxy and hydroxy, X being halogen and n being 1 to 3 have been found to be photointiators for use in the photopolymerization of monomeric and polymeric compositions of photopolymerizable substances.
Abstract:
Alpha-halogenated aromatic compounds of the formula: where X is halogen have been found to be photoinitiators for use in the photopolymerization of monomeric and polymeric compositions of photopolymerizable substances. Combination of these compounds with benzoin ether, glyoxylate and- /or acetophenone photoinitiator compounds give compositions having enhanced activity at reasonable cost.
Abstract:
@ Halodiphenylmethane compounds, for example, alpha- halogenated aromatic compounds of the formula where X is selected from the group consisting of halogen and hydrogen with at least one X being halogen, preferably chlorine and R is independently selected from hydrogen, alkyl, alkoxy and halogen, have been found to be photoinitiators for use in the photopolymerization of monomeric and polymeric compositions of photopolymerizable substances.
Abstract:
The use of amine compounds, e.g., tertiary amines containing alkanol groups, enhances the photoinitiation of glyoxylate photoinitiators, e.g., alkyl aryl glyoxylate photoinitiators.