Abstract: An improved method is provided for the melt processing of thermotropic liquid crystal polymers. An improvement in the melt processing (e.g., fiber spinning) of thermotropic liquid crystal polymers is obtained if minor amounts of a low molecular weight liquid crystalline compound are added to the melt. Improvements in spinning temperatures, take-up speed and spinning pressure are observed.

Abstract: Combinations of para-phenylene diamines and para di(nitroso) arenes act synergistically in guayule rubber-based compositions to protect them against oxidative degradation. A typically useful diamine is N-(1,3-dimethylbutyl)-N'-phenyl-phenyl-p-phenylene diamine and a useful arene is para-di(nitroso)benzene. Vulcanizable compositions, as well as articles made therefrom, are within the scope of the invention.

Abstract: Elastomers such as guayule rubber is stabilized by the addition of an alkyl, cycloalkyl or alkyl substituted cycloalkyl phenyl-phenylenediamine compound with an alkyl, cycloalkyl or alkyl substituted cycloalkyl phosphite compound which, in combination, yield an unexpectant and synergistic result.

Abstract: An organoclay-antiozonant complex suitable for incorporating in rubber formulations as an additive to inhibit and retard ozone attack is formed by complexing a substituted paraphenylenediamine antiozonant with an organoclay having been produced by treating a smectite-containing clay with a quaternary amine. The organoclay-antiozonant complex is preferably incorporated into the rubber formulation by first mixing the prepared organoclay-antiozonant complex with a naphthenic oil and a polar solvent to form a paste which is then added to the rubber formulation.

Abstract: A method of storing guayule and guayule-like plant material prior to processing which comprises mixing the material in communited form with at least one essentially water-free organic liquid to form a slurry in which the material is protected from contact with oxygen and storing said slurry for at least about 24 hours is disclosed. Preferably, the organic liquid is an alcohol, ether, ester, ketone, or hydrocarbon and optionally the slurry also contains an oxidation stabilizer.

Abstract: Under thermal aging conditions of reinforced polymeric materials, some reinforcements are not as effective as others in providing longevity for the fiber reinforced polymeric materials. A method is provided for incorporating an additional amount of antioxidant into the polymeric materials before the reinforcement is added to the polymeric materials or into an aqueous treating solution for the fibrous reinforcement. The antioxidant is of low volatility and good thermal resistance, and when added to the polymer directly is used in an amount greater than three parts per hundred parts of the polymer (PHR). When the antioxidant is added to the aqueous treating solution for treating the fibrous reinforcements, the antioxidant is in the form of an oil-in-water emulsion.

Abstract: Hydrazone derivatives of the formula ##STR1## in which A.sub.1 is an aromatic radical, B.sub.1 is hydrogen, alkyl, cycloalkyl, aralkyl or aryl, R.sub.1, R.sub.2 and R.sub.3 independently of one another are alkyl, cycloalkyl, aralkyl or polyoxyalkylene, Z.sub.1 is arylene, X.sup..crclbar. is an anion and m is 0, 1, 2 or 3.The hydrazone derivatives are suitable as UV absorbers, especially in polymer coatings.

Abstract: The heat stability of arylene sulfide resins, such as poly(p-phenylene sulfide) resin, is improved by the addition of cure retarders comprising phenolic amide or ester-based antioxidants. The resin compositions of the invention are particularly applicable for reducing gel formation during melt extrusion.

Abstract: Stabilized polyamides containing from 0.02 to 5%, by weight of a diphenylamine compound corresponding to the following general formula: ##STR1## wherein R.sup.1 and R.sup.3, which may be the same or different, represent hydrogen, a CH.sub.3 --, C.sub.2 H.sub.5 -- or isopropyl group and R.sup.3 is in the o-, m- or p-position to the N-atom substitution;R.sup.2 represents hydrogen, a C.sub.4 -C.sub.12 alkyl, C.sub.7 -C.sub.12 aralkyl or C.sub.5 -C.sub.12 cycloalkyl group and is in the o-, or p-position to the N-atom substitution;n represents an integer of from 1 to 29; andY is a divalent, non-mono-olefinically unsaturated radical having the same meaning as R.sup.2 and, in addition, may represent (in a proportion of up to 50 mole percent) --S--, --CH.sub.2 --S--CH.sub.2 --, --CH.sub.2 --O--CH-- or >CH--R.sup.4, wherein R.sup.4 represents H, C.sub.1 -C.sub.6 alkyl or C.sub.5 or C.sub.6 cycloalkyl, and may be in the o- or p-position to the N-atom substitution.

Abstract: A class of novel polymeric diphenylamine compounds are used to provide antioxidant protection to oxidizable polymers. In particular, the polymeric reaction products of diphenylamine and 1,4-diisopropenylbenzene are used in acrylonitrilebutadiene and styrene-butadiene rubbers to protect these rubbers in high temperature, oxidative working environments.

Abstract: A solid pigment composition comprises an intimate mixture of a pigment and a copolymer of an alkyl or cycloalkyl methacrylate ester and a lesser amount of an aminoalkyl methacrylate ester. The compositions are compatible with a wide range of substrates such as paints, printing inks and bulk polymers.

Abstract: There is disclosed a method for stabilization of polyester resins by incorporating in the resins novel polymeric diphenylamine compounds, produced by reacting diphenylamine with a dialkylalkenylbenzene or a dihydroxyalkylbenzene in the presence of an acid catalyst.

Abstract: A method of storing guayule and guayule-like plant material prior to processing which comprises mixing the material in communited form with at least one essentially water-free organic liquid to form a slurry in which the material is protected from contact with oxygen and storing said slurry for at least about 24 hours is discosed. Preferably, the organic liquid is an alcohol, ether, ester, ketone, or hydrocarbon and optionally the slurry also contains an oxidation stabilizer.

Abstract: Rubber compositions are disclosed which exhibit a combination of properties especially suited for use as fluid sealing elements, such as valve seals, piston seals, washers and faucet seats.

Abstract: A method for the uniform blending of additives into thermoplastic synthetic resins. A solution or finely divided dispersion of the additive is produced in a polymerizable cyclic ester of the general formula: ##STR1## wherein R represents respectively hydrogen or an alkyl group of 1-18 carbon atoms,A represents a --O-- or --COO-- group,x and y represent integers from 1 to 15, andz represents 0 or 1.This solution or dispersion, optionally after polymerization of the cyclic ester, is admixed to the thermoplastic synthetic resin at the end of its manufacturing process or in a subsequent processing stage.

Abstract: A composition of matter comprising an acetylene-terminated polyimide oligomer and a cure rate inhibitor selected from the group consisting of hydroquinone, maleic acid, glutaric acid, dibetanapthyl para-phenylene diamine. The composition has a retarded cure rate, thereby facilitating the fabrication of void-free molded objects and composites.

Abstract: A normally liquid stabilizer for rubber or urethane resin, obtained by reacting hydroquinone with a mixture of aromatic amines of the formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3, independently of each other, are hydrogen or C.sub.1-18 alkyl, said aromatic amine mixture containing 7-26 weight % of p-ethylaniline and 8-40 weight % of 2,4-xylidine.

Abstract: A composition for coating a substrate for use in an image wise developable or transferal system comprises (I) a free base of a cationic solvent dye capable of developing a color or at least a more intense color upon reaction with an organic acid developing compound and (II) a binder which is a wax or resin which does not develop said free base and which has been mixed with said free base in the presence of a non developing substantially non-polar solvent. Various forms of coating including the color developer composition in a layer or particulate form are applicable to different end uses.