Oxygen scavenging composition

An oxygen scavenging composition for polyester resins comprising a resin carrier;

• iron particles mixture dispersed in the said carrier
• said iron particle mixture consisting of
• [i] micron sized iron particles having particle size in the range of 1 to 50 microns;
• [ii] nano sized iron particles having particle size in the range of 5 to 50 nano meters;
• and
• an oxidation reaction accelerator.

An oxygen scavenging composition for polyester resins comprising a resin carrier;

• iron particles mixture dispersed in the said carrier
• said iron particle mixture consisting of
• [i] micron sized iron particles having particle size in the range of 1 to 50 microns;
• [ii] nano sized iron particles having particle size in the range of 5 to 50 nano meters;
• an oxidation reaction accelerator;
• and
• barrier additives.

An oxygen scavenging composition for polyester resins comprising a resin carrier;

• iron particles mixture dispersed in the said carrier
• said iron particle mixture consisting of
• [i] micron sized iron particles having particle size in the range of 1 to 50 microns;
• [ii] nano sized iron particles having particle size in the range of 5 to 50 nano meters;
• an oxidation reaction accelerator;
• barrier additives;
• color imparting additives, and ultraviolet light absorbers.

A method of preparing an oxygen scavenging composition for polyester resins comprising the steps of

• (i) preparing an intimate mixture of dried micron sized iron particles having particle size in the range of 1 to 50 microns and dried nano sized iron particles having particle size in the range of 5 to 50 nano meters to form an iron particle mix;
• (ii) uniformly dispersing the said iron particle mix up to a maximum of 25% in a resin carrier to form a master batch;
• and
• (iii) storing the said master batch in an inert atmosphere until required for adding in a polyester resin for imparting oxygen scavenging property.

A method of imparting oxygen scavenging properties to a polyester resin comprising the steps of

• (i) preparing a master batch containing an oxygen scavenging composition comprising a resin carrier;
• and
• iron particles mixture dispersed in the said resin carrier
• said iron particle mixture consisting of
• [a]micron sized iron particles having particle size in the range of 1 to 50 microns;
• [b] nano sized iron particles having particle size in the range of 5 to 50 nano meters
• (ii) adding the said master batch to dry polyester resin prior to extrusion/injection molding/stretch blow molding the polyester resin such that the final quantity of the iron particle mix in the polyester resin is in the region of 2500 ppm to 3500 ppm.