Abstract: An insert molded arrowhead having orthogonal primary and secondary blades and a method for manufacturing the arrowhead are disclosed. The primary and secondary blades have slots adjacent their forward and rearward ends which interfit to form a blade assembly. The blade assembly is placed in a mold and insert molded with plastic. The plastic interlocks the interfitting blades, forms wedging ridges along cutting edges laterally disposed on the blade assembly, and encircles a stem member extending rearwardly from the blade assembly, forming a connector portion for securing the arrowhead to an arrow shaft.

Abstract: Polyphase, transparent, polyblock, oligomer-free, segmented urethane polymers having molecular weights of from about 100,000 to about 200,000 and being eminently suited for use in medical devices such as blood bags, etc., are deriveable from chain extenders, free diisocyanate molecules and prepolymers consisting essentially of linear molecules which are terminated at each end by isocyanate groups. The prepolymer molecules consist of n branched, polyether glycol residues joined through intervening carbamate groups with (n+1) diisocyanate residues, n ranging from about 1 to 4 and having an average value of less than 2. The polyether glycols have molecular weights of from about 1000 to about 6000 and are methylol-terminated chains of C.sub.3 -C.sub.6 alkylene oxide units. Importantly, the final polymers are free of domain crystallinity.

Abstract: Excess ethylene carbonate is reacted with p-hydroxybenzoic acid in the presence of a catalytic amount of potassium iodide, potassium bromide, potassium fluoride, cesium iodide or cesium fluoride to make hydroxyethyl p-(hydroxyethoxy)benzoate.

Abstract: Prepare 4-amino-1,3-dicyano-2-methyl-1,3-pentadiene and related substituted aminodienes by contacting .beta.-aminocrotononitrile and related substituted aminoalkenes with a base acceptor in a solvent under mild conditions.

Abstract: Waste or surplus polycarbonates are salvaged by reacting them with a hydroxy amine in an amount sufficient to cleave about 85% or more of the carbonate groups, thereby converting the polymer to a mixture of dihydroxy monomers--including novel dihydroxy carbamates--which may be converted to useful polymers by reaction with other difunctional monomers having at least one hydroxy-reactive functional group per molecule.