Abstract:
The present invention discloses an efficient process for the production of high molecular weight polyester resin having IV of about 0.5 dl/g to about 1.2 dl/g from low molecular weight prepolymer having IV of about 0.2 dl/g to about 0.45 dl/g by adding a Lewis acid such as sulfonic acid at any steps during the esterification step or the melt polymerization step but before a particle former process to reduce the oligomer volatilization during solid state polymerization. The Lewis acid such as sulfonic acid is selected from methane sulfonic acid, para toluene sulfonic acid, toluene sulfonic acid, benzene sulfonic acid or xylene sulfonic acid. The present invention also discloses a low molecular weight crystalline prepolymer having IV of about 0.2 dl/g to about 0.45 dl/g and high molecular weight polyester resin having IV of about 0.5 dl/g to about 1.2 dl/g produced by the above process.
Abstract:
This disclosure relates to an oxygen scavenging composition and a packaging article prepared there from. The oxygen scavenging composition comprises a polyester component; an organic oxidizable polymeric component; and a sulfonated metal oxidation catalyst. The oxygen scavenging effect of the packaging article is controllable within a time period ranging between zero minutes and the lifetime of the packaging article in the configuration in which it is packed.
Abstract:
The invention relates to active oxygen-scavenger based polymer resin composition for oxygen barrier, a process for preparing such composition and articles such as bottles or other format of packaging. These compositions have an ability to consume an amount of oxygen and thereby deplete the level of the same from the immediate atmosphere surrounding the packaged content and at ambient temperatures.
Abstract:
The present invention discloses an efficient process for the production of high molecular weight polyester resin having IV of about 0.5 dl/g to about 1.2 dl/g from low molecular weight prepolymer having IV of about 0.2 dl/g to about 0.45 dl/g by adding a Lewis acid such as sulfonic acid at any steps during the esterification step or the melt polymerization step but before a particle former process to reduce the oligomer volatilization during solid state polymerization. The Lewis acid such as sulfonic acid is selected from methane sulfonic acid, para toluene sulfonic acid, toluene sulfonic acid, benzene sulfonic acid or xylene sulfonic acid. The present invention also discloses a low molecular weight crystalline prepolymer having IV of about 0.2 dl/g to about 0.45 dl/g and high molecular weight polyester resin having IV of about 0.5 dl/g to about 1.2 dl/g produced by the above process.
Abstract:
A method and quench apparatus (1 ) for melt spinning of continuous polymeric filament yarns having enhanced fiber uniformity with increased productivity. Polymeric filaments (15) are extruded from a moltem polymeric material (not shown) through the capillaries (not shown) in the spinneret (2). The filaments are cooled in the quench apparatus located underneath the spinneret and comprising a cooling chamber (6) formed of a foraminous section (7a) and a non-foraminous section (7b) and a jacket (8) located around the cooling chamber in spaced apart relationship therewith to form a plenum chamber (9) for a cooling gas (not shown) entering the quench apparatus through a gas inlet (10) provided with the jacket.
Abstract:
The invention relates to active oxygen-scavenger based polymer resin composition for oxygen barrier, a process for preparing such composition and articles such as bottles or other format of packaging. These compositions have an ability to consume an amount of oxygen and thereby deplete the level of the same from the immediate atmosphere surrounding the packaged content and at ambient temperatures.
Abstract:
The invention relates to a monomelic antimicrobial agent, to a copolymer and polymer compositions having antimicrobial activity and to articles and products prepared from them. The invention also relate to methods for preparing the anti microbial copolymer and polymer compositions. The monomeric antimicrobial agent of the invention has the general formula (R)j-(SO3MM)m(L)n where j, l, m is an integer from 1 to 6, n is an integer from 0 to 6, M is a metal selected from Ag, Cu or Zn, L is a nitrogen, phosphorus or sulphur containing ligand selected from ammonia, an amine, pyridine, imidazole, pyrazole, triaryl phosphine, trialkyl phosphine, triaryl phosphate, trialkyl phosphate or a thiol, R is a linear or branched unsubstituted or substituted alkyl or alkenyl, an aryl or a substituted aryl carrying at least one reactive functional group.
Abstract:
The invention relates to a monomelic antimicrobial agent, to a copolymer and polymer compositions having antimicrobial activity and to articles and products prepared from them. The invention also relate to methods for preparing the anti microbial copolymer and polymer compositions. The monomeric antimicrobial agent of the invention has the general formula (R) j -(SO 3 MM) m (L) n where j, l , m is an integer from 1 to 6, n is an integer from 0 to 6, M is a metal selected from Ag, Cu or Zn, L is a nitrogen, phosphorus or sulphur containing ligand selected from ammonia, an amine, pyridine, imidazole, pyrazole, triaryl phosphine, trialkyl phosphine, triaryl phosphate, trialkyl phosphate or a thiol, R is a linear or branched unsubstituted or substituted alkyl or alkenyl, an aryl or a substituted aryl carrying at least one reactive functional group.
Abstract:
The invention relates to a monomelic antimicrobial agent, to a copolymer and polymer compositions having antimicrobial activity and to articles and products prepared from them. The invention also relate to methods for preparing the anti microbial copolymer and polymer compositions. The monomeric antimicrobial agent of the invention has the general formula (R)j-(SO3MM)m(L)n where j, l, m is an integer from 1 to 6, n is an integer from 0 to 6, M is a metal selected from Ag, Cu or Zn, L is a nitrogen, phosphorus or sulphur containing ligand selected from ammonia, an amine, pyridine, imidazole, pyrazole, triaryl phosphine, trialkyl phosphine, triaryl phosphate, trialkyl phosphate or a thiol, R is a linear or branched unsubstituted or substituted alkyl or alkenyl, an aryl or a substituted aryl carrying at least one reactive functional group.
Abstract:
A method and quench apparatus for melt spinning of continuous polymeric filaments having enhanced uniformity of denier and tenacity. Polymeric filaments are extruded from a molten polymeric material (not shown) through the capillaries (not shown) of a spinneret (2). The filament bundle (12) emerging from the spinneret is passed through a quench apparatus (Ia) located underneath the spinneret so as to cool the filament bundle by a cooling gas. A finish agent is applied to the filament bundle by a finish applicator (14) located in the path of the filament bundle. The filament bundle exiting the quench apparatus is taken on a take up device (17). The entraining gas and filament bundle are guided towards the finish applicator by a baffle device (11) located in the path of the filament bundle spaced from the finish applicator so as to stabilize the filament bundle towards the finish applicator and improve finish coverage on the filament bundle and uniformity of denier and tenacity of the filaments (Fig 1).