Loading patent…
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsRyoji Otaki, Sotaro Hiramatsu
Estimating the term…
In the process for producing an oxygen absorbing polyamide resin composition of the present invention, a diamine component containing 70 mol % or higher of m-xylylenediamine is polycondensed with a dicarboxylic acid component containing 50 mol % or higher of adipic acid in the presence of a phosphorus compound. A compound or complex containing at least one metal selected from the group consisting of transition metals of Group VIII of the Periodic Table, manganese, copper and zinc is added to reaction system either prior to initiation of the polycondensation reaction or during the polycondensation reaction such that a ratio (P/M) of a concentration of phosphorus P (mmol/g) in the phosphorus compound contained in the polyamide resin composition to a concentration of the metal M (mmol/g) in the polyamide resin composition is 0.02 to 1.0.
A process for producing an oxygen absorbing polyamide resin composition by subjecting a diamine component containing 70 mol % or higher of m-xylylenediamine with a dicarboxylic acid component containing 50 mol % or higher of adipic acid to polycondensation reaction in the presence of a phosphorus compound, said process further comprising:
An oxygen absorbing polyamide resin composition produced by subjecting a diamine component containing 70 mol % or higher of m-xylylenediamine and a dicarboxylic acid component containing 50 mol % or higher of adipic acid to polycondensation reaction in the presence of a phosphorus compound, wherein a compound or complex containing at least one metal selected from the group consisting of transition metals of Group VIII of the Periodic Table, manganese, copper and zinc is also added to reaction system either before initiation of the polycondensation reaction or during the polycondensation reaction such that a ratio (P/M) of a concentration of phosphorus P (mmol/g) in the phosphorus compound contained in the polyamide resin composition to a concentration of the metal M (mmol/g) in the polyamide resin composition is 0.02 to 1.0.
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Derived from polyamines and polycarboxylic acids: preparatory processes
Layered products comprising a layer of synthetic resin: comprising polyamides
Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids: preparatory processes
Derived from polyamines and polycarboxylic acids: from at least two different diamines or at least two different dicarboxylic acids
Term ended 18 Jun 2023 (estimated)
The present invention relates to a process for producing an oxygen absorbing polyamide resin composition, and an oxygen absorbing polyamide resin composition produced by the process. More particularly, the invention relates to a process for producing an oxygen absorbing polyamide resin composition having a stable quality which process comprises subjecting starting components to polycondensation reaction in the presence of a compound or complex containing at least one metal selected from the group consisting of transition metals of Group VIII of the Periodic Table, manganese, copper and zinc, and a phosphorus compound which are added in specific amounts, and an oxygen absorbing polyamide resin composition produced by the process.
Some of metallic cans or glass bottles conventionally used as packaging containers having an excellent keeping property for their contents by inhibiting oxygen from entering thereinto from outside, have now been replaced with plastic containers made of gas barrier thermoplastic resins in view of processability and inexpensiveness. The gas barrier thermoplastic resins are required to show a low permeability to gaseous substances such as oxygen and carbon dioxide and easiness in processing as well as good transparency and mechanical strength. For this reason, as the gas barrier thermoplastic resins, there have been widely used especially ethylene-vinyl alcohol copolymer or polyamides produced by the polycondensation reaction between a diamine component composed mainly of m-xylylenediamine, and a dicarboxylic acid component composed mainly of adipic acid (hereinafter referred to merely as “nylon MXD6”). However, the packaging containers made of the gas barrier thermoplastic resins inevitably suffer from non-negligible amounts of gases penetrated thereinto from outside during long-term storage as compared to the conventional packaging containers made of metals or glass which are substantially completely free from gases penetrated thereinto from outside. In addition, when preserved under high humidity condition, the gas barrier thermoplastic resins for the packaging containers tend to undergo increase in amount of gases penetrated therethrough. Therefore, the packaging containers made of the gas barrier thermoplastic resins have problems such as poor long-term keeping property for their contents as compared to the conventional metallic cans and glass bottles.
There has been recently developed oxygen absorbing nylon MXD6 obtained by blending a small amount of transition metal compound in nylon MXD6. It has now been attempted to practically use the oxygen absorbing nylon MXD6 as a gas barrier material for packaging containers and packaging materials in order to absorb not only oxygen penetrated thereinto from outside but also residual oxygen remaining therein, thereby enhancing a keeping property for their contents as compared to those using the conventional gas barrier thermoplastic resins.
The present invention is described in detail below.
In the process for production of the oxygen absorbing polyamide resin composition according to the present invention, the polyamide resin composition is produced by polycondensing a diamine component composed mainly of m-xylylenediamine with a dicarboxylic acid component composed mainly of adipic acid in the presence of a phosphorus compound and a compound or complex containing at least one metal selected from the group consisting of transition metals of Group VIII of the Periodic Table, manganese, copper and zinc which is added to the reaction system either prior to initiation of the polycondensation reaction or during the polycondensation reaction.
The diamine component used in the process of the present invention contains m-xylylenediamine as a main component in an amount of preferably 70 mol % or higher and more preferably 80 mol % or higher. When the content of m-xylylenediamine in the diamine component is 70 mol % or higher, the polyamide obtained by the polycondensation using such a diamine component exhibits excellent gas barrier property and oxygen absorbing property.