Abstract:
A closure 40 for a container body includes a liner 46 which incorporates a hydrogen generating device comprising a hydride which generates hydrogen on contact with moisture. The liner may be an interference fit within the body 42. The liner 46 and other liners described may include control means for controlling passage of moisture to the hydrogen generating means and/or sealing means for sealing the closure to a container. In use, with the closure secured to a container, water vapor passes into liner 46 and contacts the hydride which generates hydrogen. A reaction between hydrogen and oxygen which has passed into the container takes place, catalysed by a catalyst, and water is produced. Thus, oxygen is scavenged.
Abstract:
A container (22) includes a shell (24) made from a polymer, for example PET, and incorporating a catalyst, for example a palladium catalyst. A closure (40) incorporates a plug which includes a source of hydrogen, for example a hydride. In use, with container (22) including a beverage and closure (40) in position, the headspace in the container will be saturated with water vapor. This vapor contacts the hydride associated with plug (42) and as a result the hydride produces molecular hydrogen which migrates into the polymer matrix of shell (24) and combines with oxygen which may have entered the container through its permeable walls. A reaction between the hydrogen and oxygen takes place, catalyzed by the catalyst, and water is produced. Thus, oxygen which may ingress the container is scavenged and the contents of the container are protected from oxidation.
Abstract:
Methods to minimize aldehyde content of a polymer are provided. An effective amount of an additive that contains a P-H functionality is incorporated into the polymer in the presence of an acidic of basic catalyst compositions are also provided.
Abstract:
A polyester composition with reduced acetaldehyde concentration comprising polyester, at least one hydrogenation catalyst, and at least one source of reactive hydrogen. A method for making the polyester composition is also disclosed along with polyester articles made with the polyester composition. Suitable articles include containers such as bottles. A packaged beverage comprising a container made with the polyester composition is disclosed.
Abstract:
A method to decrease an aldehyde content of a polyester. The method comprises incorporating an effective amount of an additive that is capable of catalyzing a hydride-transfer reaction between an organic donor molecule and an aldehyde in the polyester.
Abstract:
A coated plastic container provides for low permeability to gases and vapors. A method and system for coating plastic containers includes applying a thin inorganic oxide layer to the external surface of the containers with plasma-assisted vacuum vapor deposition. For example, the coating can include silica which is bonded to the external surface of the container. This coating is flexible and be can be applied regardless of the container's internal pressure or lack thereof. The coating firmly adheres to the container and possess an enhanced gas barrier effect after pressurization even when the coating is scratched, fractured, flexed and/or stretched. Moreover, this gas barrier enhancement will be substantially unaffected by filling of the container. A method of recycling coated plastic containers and a method and system for packaging a beverage using the coated containers are also disclosed.
Abstract:
A method and composition for enhancing retention of carbon dioxide in carbonated bottled beverages indicates the addition of a carbonic acid ester such as propylene carbonate, 1,3-butylene carbonate, diethyl carbonate, neopentylene carbonate and propylene carbonate or mixtures thereof. The carbonic acid ester in the aqueous medium of the beverage undergoes slow hydrolysis thereby releasing CO.sub.2 to maintain the CO.sub.2 level in the container.
Abstract:
Disclosed is a process for preparation of an aromatic thiol corresponding to the structureA-(SH)nwhereinA is a substituted or unsubstituted aromatic radical and n is 1, 2, 3, 4, 5 or 6 comprising contacting at a temperature of at least 80.degree. C. an aromatic halide corresponding to the structureA-XmwhereinA is the same as above, X is bromine oriodine and n is 1, 2, 3, 4, 5, or 6with thiourea in the presence of nickel metal.
Abstract:
A process for preparing a crystalline poly(ethylene terephthalate) having an inherent viscosity of at least 0.5 comprising(A) preparing an admixture of molten poly(ethylene terephthalate) and a zeolite, and(B) cooling the admixture at a rate less than about 300 degrees C. per minute to a temperature less than about 80 degrees C.
Abstract:
A process for preparation of a copoly(arylene sulfide) corresponding to the structure ##STR1## wherein A is a divalent substituted or unsubstituted aromatic radical, T is a monovalent aromatic radical, x is in the range of 0.5 to 0.001 and n is an integer from 1 to 100.