The Dow Chemical Company

Joseph M Baggett

George E Ham

Ruben L Krause

Clarence R Dick

Prella M Phillips

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.

Phenolphthalein-dihydroxy aromatic compound polycarbonates

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.

Process for making polycarbonates using 1,1-dimethyl urea compounds as

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

Heat stabilized thermoplastic resins containing compounds with

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.

Polycarbonates having carbamate terminal groups

A thermoplastic polycarbonate formed by reacting a carbonate precursor such as phosgene, a dihydric phenol, and an epihalohydrin-dihydric phenol prepolymer under polycarbonate forming conditions.

Polycarbonates incorporating epihalohydrin residues

Process for the preparation of aromatic polycarbonates by the interfacial technique wherein the molecular weight is controlled by adding an effective amount of ammonia or ammonium compounds to the polymerization reaction. Examples of suitable compounds effective to control the molecular weight are ammonia, ammonium hydroxide, ammonium sulfite and other ammonium salts.

Process for controlling the molecular weight of polycarbonates using

Thermoplastic polycarbonates are prepared by interfacial polymerization wherein carbonyl halides, dihydric phenols and a catalytic amount of ammonia or an ammonium compound which liberates ammonia during the reaction are reacted. The polycarbonates thus prepared have chloroformate end groups and are useful as intermediates to be capped with various terminal groups in a know manner.

Process for making polycarbonates using ammonia or ammonia compounds as

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.

Process for controlling the molecular weight of aromatic polycarbonates

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.

Wet strength resin

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.

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Freeport, TX, United States of America

Joseph M Baggett