Abstract: An oxygen scavenging ribbon comprises a heat sealable resin and an oxygen scavenging material. This ribbon, upon oxidation of the oxygen scavenging material, does not release significant amounts of byproducts which are odorous and/or non-GRAS food additives. This ribbon can be in a number of forms including a multilayer casting or blown film tube. This ribbon provides a great deal of flexibility in the scavenging of oxygen within packaging environments.

Abstract: Disclosed is a process for esterifying and/or transesterifying a polymer having a polyethylenic backbone and pendant acid and/or ester moieties comprising contacting a melt of the polymer with a transesterifying compound so that the polymer undergoes esterification and/or transesterification but not alcoholysis. The esterified or transesterified polymer also has pendant ester moieties which differ in kind and/or number from the unreacted polymer. In one embodiment, the process also comprises adding an amount of a transition metal salt that is effective to promote oxygen scavenging. Also in a further embodiment, the process comprises irradiating the transesterified polymer with actinic radiation to reduce the induction period before oxygen scavenging commences. Also disclosed are compositions comprising a component which comprises an ethylenic or polyethylenic backbone and a pendant or terminal moiety comprising a benzylic, allylic, or ether-containing radical.

Abstract: An improved oxygen scavenging system is provided. The system involves an oxygen scavenging phase containing at least one oxygen-scavenger and a second phase comprising at least one catalyst effective in catalyzing a scavenging reaction. The oxygen scavenging phase is substantially devoid of any catalyst of the scavenging reaction and the second phase is effectively separate from the oxygen scavenging phase. Nevertheless, the oxygen scavenging system provides excellent scavenging capabilities while avoiding many of the prior art problems, such as undesired oxidation during high temperature processing when the system is incorporated into a multi-layer film.

Abstract: The invention provides a composition of matter having oxygen scavenger capabilities. The composition comprises a blend of a first polymeric component comprising a polyolefin, the first polymeric component having been grafted with an unsaturated carboxylic anhydride or an unsaturated carboxylic acid, or combinations thereof, or with an epoxide; a second polymeric component having OH, SH or NHR.sup.2 groups where R.sup.2 is H, C.sub.1 -C.sub.3 alkyl, substituted C.sub.1 -C.sub.3 alkyl; and a metal salt capable of catalyzing the reaction between oxygen and the second polymeric component, the polyolefin being present in an amount sufficient so that the blend is non phase-separated. In the preferred composition maleic anhydride is the grafted material, the second polymeric component is MXD6 nylon and the metal is cobalt. A method of providing a homogeneous blend of a polyolefin with a second polymeric component having OH, SH or NHR.sup.2 groups is also set forth.

Abstract: Ionomer compositions which have improved optical properties are disclosed. These compositions comprise ionomers which can be represented as the polymerization product of alpha-olefins having from two to eight carbon atoms, esters of alpha, beta-ethylenically-unsaturated carboxylic acids, metal salts of acrylic and methacrylic acid, and optional alpha, beta-ethylenically-unsaturated comonomers which impart some desired polymer property or properties, such as acidity and/or solvent resistivity. Also disclosed are methods of making these ionomer compositions in a reactive extruder and treating the compositions with acid to impart acidity to the compositions or to only the surface of the compositions.

Abstract: A water thickening terpolymer of polymerized units of (A) about 50 to 98 mole percent of acrylamide, (B) about 1.9 to 49.9 mole percent of an alkali metal salt or ammonium salt of acrylic acid, and (C) about 0.1 to 5 mole percent of a copolymerizable ionic surfactant containing (1) an acrylyl or methacrylyl group, (2) a pendant hydrophobic group of 6 to 24 carbon atoms, and (3) an ionic polar group.

Abstract: Polycarbonate resins can be stabilized against the adverse influence of UV light by incorporating an effective amount of a methyl benzoate ester stabilizer by means of a coating on the surface of the resin.

Abstract: This invention relates to coating compositions prepared by prehydrolyzing the silane function of a silylated ultraviolet radiation screening compound and adding it to an aqueous silicone resin composition. Hydrolyzing the silane function renders the ultraviolet screen a silanol which is a compatible component in the silicone resin compositions contemplated.

Abstract: A method is provided for improving the weatherability of a polycarbonate substrate by initially treating the surface of the polycarbonate substrate with a solution of a hydrolyzed silylated organic U.V. screen followed by the application of a curable silicone hardcoat composition onto the treated substrate.

Abstract: A silicone hardcoat composition for plastic substrates is provided in the form of an aqueous cohydrolyzate of chemically combined siloxy units, organosiloxy units and siloxy units having from 1-3 chemically combined UV stabilizing organic groups attached to silicon by carbon-silicon bonds. Thermoplastic substrates treated with such silicone hardcoat compositions are also provided.

Abstract: A silicone hardcoat composition for plastic substrates is provided in the form of an aqueous cohydrolyzate of chemically combined siloxy units, organosiloxy units and siloxy units having from 1-3 chemically combined UV stabilizing organic groups attached to silicon by carbon-silicon bonds. Thermoplastic substrates treated with such silicone hardcoat compositions are also provided.

Abstract: Alkoxysilylacrylamides, alkoxysilylacrylates and alkoxysilylbenzylidene malonates are provided and a method for making such materials. These alkoxysilanes have been found useful as UV stabilizers and as adhesion promoters when incorporated into silicone compositions useful as top coats for thermoplastic organic polymers.

Abstract: Thermoplastic substrates are provided having a thermoset acrylic primer and a silicone hard coat containing an alkoxysilylbenzotriazole UV stabilizer to impart improved abrasion resistance and UV stabilization thereto.

Abstract: Certain 3-alkylhydroxybenzophenone derivatives, such as 2,4-dihydroxy-3-methylbenzophenone have been found to be superior as UV stabilizers for a variety of organic polymeric substrates. Coating compositions of such stabilizers in organic resins, for example, melamine can be used to protect such polymeric substrates from the effects of exposure to UV radiation.

Abstract: Alkoxysilylbenzotriazoles are provided and method for making such materials. These alkoxysilanes have been found useful as UV stabilizers and as adhesion promoters for silicone top coat compositions which can be applied onto thermoplastic organic polymers to impart improved abrasion resistance and UV stabilization thereto.

Abstract: Alkoxysilylacrylamides, alkoxysilylacrylates and alkoxysilylbenzylidene malonates are provided and a method for making such materials. These alkoxysilanes have been found useful as UV stabilizers and as adhesion promoters when incorporated into silicone compositions useful as top coats for thermoplastic organic polymers.

Abstract: Certain 3-alkylhydroxybenzophenone derivatives, such as 2,4-dihydroxy-3-methylbenzophenone have been found to be superior as UV stabilizers for a variety of organic polymeric substrates. Coating compositions of such stabilizers in organic resins, for example, melamine can be used to protect such polymeric substrates from the effects of exposure to UV radiation.

Abstract: Certain dichloroformates are described which have utility for imparting UV stability to polycarbonate resins which are interpolymerized with the former.

Abstract: UV stabilizing units are incorporated in a polycarbonate molecule to impart UV stability to the polycarbonate.

Abstract: Polycarbonate resins can be rendered resistant to ultraviolet light by chain-stopping the resins with certain cyanoacrylate moieties.