Abstract: Phenolphthalein-dihydroxy aromatic compound polycarbonates are disclosed wherein the mole ratio of phenolphthalein to dihydroxy aromatic compound is in the range from about 0.05 to about 0.7 and the weight average molecular weight range is from about 25,000 to about 50,000 as determined by gel permeation chromatography.These copolymers exhibit improved impact strength, heat resistance, creep resistance, tensile strength at high temperates and stress crack resistance.

Abstract: Thermoplastic polycarbonates are prepared by interfacial polymerization wherein carbonyl halides, dihydric phenols and a catalytic amount of a 1,1-dimethyl urea compound is reacted.The polycarbonates thus prepared are useful as moldable resins in a manner well known in the art.

Abstract: Thermoplastic resin compositions are heat stabilized by the addition of 0.01 to 1.0 percent by weight of an organo-phosphorus compound having one of the formulas(R.sub.1) (R.sub.2) P (.dbd. X).sub.a -- P(.dbd. X).sub.a (R.sub.1) (R.sub.2) I(p -- r.sub.1).sub.n II(r.sub.1) (r.sub.2) p (.dbd. x).sub.a -- P(R.sub.3) -- P(.dbd. X).sub.a (R.sub.1) (R.sub.2) IIIwherein a is independently 0 or 1, n is 3 to 6, X is oxygen or sulfur, R.sub.1, R.sub.2, and R.sub.3 are independently dialkylamino, alkoxy, aryloxy, alkyl, aryl, alkaryl, aralkyl, or MO where M is an alkali metal, or R.sub.1 and R.sub.2 taken with the P atom represent a cyclic structure.

Abstract: Aromatic polycarbonates having carbamate end groups are prepared using a terminating amount of ammonia, ammonium compounds, primary cycloalkyl, aliphatic, or aralkyl amines and secondary cycloalkyl, alkyl, or aralkyl amines. The products of this invention have been found to have a relatively high limited oxygen index compared to polycarbonates without carbamate end groups.

Abstract: Process for the preparation of aromatic polycarbonates by the interfacial technique wherein the molecular weight is controlled by adding an effective amount of metallic sulfites to the polymerization reaction. The metallic sulfites are exemplified by alkali metal sulfites, pyrosulfites and hyposulfites.

Abstract: Water-soluble thermosetting cationic resins having improved properties are prepared by a process wherein a small excess of epichlorohydrin is reacted with an aqueous solution of ammonia to form an intermediate resin solution, this resin solution is reacted with sufficient strong base to neutralize the ionic chloride present, then additional epichlorohydrin is reacted with the neutralized resin solution. The final resin product is useful as an additive to enhance the wet strength of paper.

Abstract: Novel copolymers are prepared in the novel process comprising copolymerizing an N-substituted aziridine with a vicinal epoxide or episulfide. Compounds having at least one active hydrogen, such as water or an alcohol, may be advantageously included as coreactants in the process. The structure of the copolymers, exclusive of any chain-extending or terminal groups, is defined by alternating ring-opened units of the N-substituted aziridine monomer and the epoxide or episulfide monomer. The copolymers are useful as stabilizers for chlorinated solvents, rubber cure accelerators, antioxidants, surfactants, lubricants, acid scavengers, dye-retention aids, retention aids for starch, and as flocculants.