Abstract: Disclosed herein are coagulated impact modifier polymers having improved powder flow, bulk density and reduced caking tendency. These compositions are preferably prepared by introducing an emulsion of a hard, non-elastomeric polymer into a slurry of a coagulated impact modifier polymer, then coagulating and drying the resultant blend.

Abstract: Improved system for delivering a controllable concentration of anesthetic gas to a patient by eluting with a carrier gas a solid polymeric adsorbent previously loaded with an anesthetic, the concentration being dependent only on the adsorbent temperature and the initial quantity of adsorbed anesthetic. Preferred embodiments utilize the polymeric adsorbent's capability of delivering a broad range of concentrations at low flow rates in a recycle delivery system.

Abstract: Compositions comprising soluble or partly soluble blend of (A) polyglutarimide and (B) styrene-acrylonitrile copolymer, a multiple stage polymer having a styrene-acrylonitrile stage, or mixtures thereof.

Abstract: Wear-resistant, high compressive strength permanent dental restorations are prepared from novel compositions comprising (a) a liquid monomer system comprised of one or more monoethylenically unsaturated monomers and one or more polyethylenically unsaturated monomers, (b) a solid particulate system insoluble in the liquid monomer system (a) comprised of a mixture of both organic and inorganic particulate substances, and (c) a free radical initiator system.

Abstract: Compositions comprising polyethylene terephthalate and an additive to promote crystallization rate and improve surface appearance selected from the group consisting of monomeric esters of citric acid and epoxidized esters of unsaturated aliphatic carboxylic acids. Compositions comprising polyethylene terephthalate, poly (C.sub.4 -C.sub.6) terephthalate, and a surface appearance and crystallization rate improving additive selected from the group consisting of monomeric esters of citric acid, organic esters of an aromatic carboxylic acid of 7 to 11 carbon atoms containing at least one carboxyl group per aromatic nucleus and an alcohol, oligomeric polyesters, and epoxidized esters of unsaturated aliphatic carboxylic acids.

Abstract: Methyl methacrylate-butadiene-styrene polymer impact modifiers are improved by mixing them with about 0.01 to 5 percent by weight of a compound of the formula ##STR1## wherein R.sub.1 and R.sub.2 are C.sub.1 to C.sub.4 alkyl, R.sub.3 and R.sub.4 are H, C.sub.1 to C.sub.4 alkyl, or 4'-hydroxy-2'-R.sub.2 -5'-R.sub.1 -phenyl. Polyvinyl chloride (PVC) is mixed with the improved impact modifiers and has improved dispersion and resistance to discoloration.

Abstract: A process for the production of a zero valent metal from an aqueous solution of a salt of the metal comprises contacting the solution with polyacetylene for a period of time sufficient to reduce at least a portion of the metal salt to a zero valent metal while leaving the polyacetylene in a substantially non-doped state. The metal salt has a reduction potential of about +0.5V or greater.

Abstract: A tie coating composition comprising a polymer or copolymer of an alkyl methacrylate and a flow improver dissolved in an organic solvent system is applied to a polycarbonate substrate prior to applying a silicone or siloxane-based abrasion resistant coating.

Abstract: A polyethylene terephthalate polycondensation catalyst system comprises from about 2 parts to about 18 parts of catalyst metal in the form of an alkyl titanate and from about 40 parts to about 300 parts of catalyst metal in the form of an antimony compound, each of said metals being per million parts of polymer product.

Abstract: A mixture of a water swellable clay mineral and an alkali soluble and thickenable (meth)acrylic acid emulsion copolymer provides a highly effective thickening and gelling agent for aqueous systems at low concentrations. The gels are self-supporting and have high strength and thus are particularly useful as air fresheners and other applications where firm gels are desirable. A synergistic thickening effect between the (meth)acrylic acid copolymer and the clay mineral is observed.

Abstract: A process for preparing a low molecular weight water-soluble polymer comprises reacting, in an aqueous solution system, a water-soluble monomer selected from the class consisting of (a) acrylic acid, methacrylic acid, acrylamide, acrolein, methacrolein, methacrylamide, N-vinyl pyrollidone, acryloxypropionic acid and mixtures thereof, and (b) water-soluble comonomers of one or more of the monomers of (a) with from about 5-50% of the total monomers present, of a comonomer selected from the class consisting of itaconic acid, fumaric acid, maleic acid, hydroxypropylmethacrylate, hydroxyethylacrylate, hydroxypropylacrylate, hydroxyethylmethacrylate, acrylonitrile, methacrylonitrile, dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, t-butylaminoethyl acrylate, 4-vinyl pyridine, beta-hydroxyethyldimethylaminoethyl methacrylate salt, t-butylaminoethyl methacrylate, and mixtures thereof in the presence of a catalyst system which comprises an initiator and a metal salt wherein the molar ratio of the initiat

Abstract: Amorphous polyethylene terephthalate can be polycondensed in the solid phase to a higher molecular weight product by a continuous process involving preheating the polymer under forced motion, at least partially crystallizing the preheated polymer in a fixed bed, and polycondensing the polymer in a forced motion reactor at temperatures in the range of 220.degree. to 245.degree. C.

Abstract: A process for producing a strong acid cation exchange resin having enhanced thermal stability comprises the steps of (1) chlorinating or brominating the aromatic nuclei of polymer beads prepared from a monomer system selected from the class consisting of (a) monovinyl aromatic monomers and polyvinyl aromatic monomers and mixtures thereof and (b) one or more monomers of (a) with up to about 5% by weight of the polymer of a monomer selected from the class consisting of acrylonitrile, methyl acrylate, methyl methacrylate, and mixtures thereof, and when a monovinyl aromatic monomer is present, a polyvinyl aromatic monomer is also present in an amount of at least about 4% by total weight of the polymer or copolymer, and (2) sulfonating the chlorinated or brominated polymer to produce a resin having enhanced thermal stability. A strong acid cation exchange resin prepared by the above process wherein the aromatic nuclei of the polymer beads are chlorinated or brominated.

Abstract: Stainless steel belts having a thickness of about 0.060 inch used for casting sheet materials such as acrylic plastic sheet are refurbished by first grinding the back surface of the belt until no further distortions can be removed and then grinding the mirrored surface of the belt until said mirrored surface is uniformly dull and thereafter polishing the dulled surface to a mirrored finish. During the grinding and polishing, the belt is cooled to avoid local overheating.

Abstract: A method for removing cumene vapor from a cumene-containing vapor stream comprises passing the vapor stream through a bed of a substantially dry hydrophobic, macroreticular, water-insoluble, crosslinked polymer containing from 20% to 100% by weight of the polymer, of divinylbenzene or a copolymer of divinylbenzene, the balance being ethylvinylbenzene or styrene or mixtures thereof but not more than 50% of either ethylvinylbenzene or styrene, until the capacity of the polymer or copolymer to remove cumene is substantially exhausted. Thereafter, the cumene is desorbed from the mass or bed of the polymer or copolymer by passing steam through said mass or bed. Without drying, the mass or bed is then ready for reuse.

Abstract: An ion exchange resin composition which comprises the reaction product of an epihalohydrin with a polyamine is alkylated. The polyamine has a molecular weight of from about 60 to about 298. This invention also encompasses a process for preparing the ion exchange resin composition which comprises reacting from about two-thirds of a stoichiometric amount of epihalohydrin to one and one-half times the stoichiometric amount of epihalohydrin with defined polyamines and thereafter reacting the resultant polymer with an alkylating agent to yield the final product.

Abstract: Disclosed is a method for preparing an impact-resistant, high melt flow polycarbonamide comprising the steps of:(a) preparing an impact modifier concentrate comprising a mixture of (i) 70-90 parts by weight of an acrylic impact modifier and (ii) 10-30 parts by weight of at least one high molecular weight aliphatic polycarbonamide; and(b) mixing 10-30 parts by weight of the impact modifier concentrate from (a) above with 70-90 parts by weight of at least one low molecular weight aliphatic polycarbonamide.The resulting polycarbonamide blends are characterized by high impact resistance and a melt flow which is essentially the same as that of the blend of the acrylic impact modifier and the low molecular weight nylon alone.

Abstract: A process for the preparation of a .alpha.,.beta.-unsaturated carboxylic acid by reacting formaldehyde, another aldehyde and a mineral acid salt of a secondary amine to form an intermediate Mannich base salt; oxidizing the Mannich base salt to the corresponding aminoacid salt; thermally cracking the aminoacid salt to yield an aqueous reaction products mixture of an .alpha.,.beta.-unsaturated carboxylic acid and the mineral acid salt of the secondary amine; and separating and isolating the aqueous reaction products.

Abstract: Esters of 4-substituted 2-methyleneglutaric acids are prepared by reacting an ester of acrylic acid with an ester of an .alpha.-substituted acrylic acid, such as an ester of methacrylic acid, in the presence of a tertiary organic phosphine, an organic phosphorus triamide, an organic phosphonous diamide, or an organic phosphinous amide.

Abstract: The removal of the polymerization inhibitor p benzoquinone from acrylic and methacrylic monomers is effectuated by adding to the inhibited monomers either prior to distillation or during distillation in a distillation zone, sufficient amounts of a monoalkyl substituted hydroquinone, a 2,5-dialkyl substituted hydroquinone or a dihydroxynaphthalene to prevent the benzoquinone from co-distilling with the monomer or to convert the benzoquinone in a distillation zone to a non-volatile compound during the distillation so that the converted benzoquinone returns to the feed flask.