Title of Invention | LUBRICANT COMPOSITION FOR POST-LUBRICATION OF ALUMINIUM FOILS AND PROCESS FOR PREPARATION THEREOF |
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Abstract | A lubricant composition suitable for post-lubrication of aluminium foils, comprises: (a) about 90 to 98 parts by mass of a refined petroleum fraction forming base material for the composition, said refined petroleum fraction being paraffinic in nature and having a carbon chain length of 20 to 30 carbon atoms, paraffinic carbon content of at least 98% and kinematic viscosity of 10 to 20 mm2/s at 40°C ; (b) about 1.5 to 10 parts by mass of a straight chain fatty acid forming a first additive and having a carbon chain length of 10 to 18 carbon atoms ; and (c) about 0.1 to 0.5 parts by mass of an inhibited phenolic compound forming a second additive, the three components (a) (b) and (c) being of IP or equivalent grade. |
Full Text | Introduction The present invention relates to a lubricant composition and process of preparation thereof. The lubricant composition is particularly suitable for post- lubrication of aluminium foils used to manufacture Semi Rigid Containers (SRC) of multiple designs. These Semi Rigid containers are used in food packaging. Half of Aluminium packaging is semi-rigid and flexible. Examples of such packaging are container, foil and laminates. All these products are made from aluminium foils. Manufacturing Aluminium Semi Rigid Container (SRC) foil using AA 8011 and AA 3003 alloy is known. Thickness of this foil varies between 0.045 mm to 0.100 mm. Foils manufactured are either soft or hard, depending upon end application. The SRC foil undergoes some forming/pressing/drawing operation during manufacture of containers. Forming/drawing operation is carried out using cavity machine. During such operation, the foil may develop cracks/breaks, which render the product unfit for use. Therefore, it becomes necessary to provide lubrication to foil surface to avoid cracking/breaking during the deformation process. Lubrication of foil on both the sides is done at lubricator machine. Since the containers will be used for food packaging, the lubricant used should meet the following requirements : The lubricant should be made from Food Grade material; The lubricant should have adequate lubricity; The lubricant should be odourless ; The lubricant should not leave any patches/stains on aluminium foil. Background The post-lubrication of aluminium foil for food packaging has been a problem because, the lubricant has to be a food grade material. The oil layer on aluminium surface should be thin and uniform and free from lubricant patches and stains. The lubricated foil should not have any remarkable/noticeable odour. In other words, it should be possible to control the lubricant film thickness/film weight (which is dictated by the extent of deformation and end-use of the post- lubricated foil. In the case of SRC, the depth of deformation can go as high as 2.5 inches). Hence, the lubricant should possess low viscosity to facilitate control of thickness and uniformity. Therefore, the desirable aspects of tubricant to be used are: Lubricant should possess excellent lubricity to prevent cracking/tearing of foil during deformation operation; The components of the lubricant should be of food grade ; Lubricant should be free from any remarkable / noticeable odour; Lubricant should have good adhesive property; Lubricant should resist oxidation/hydrolysis/rancidity (food grade materials have general tendency to undergo these reactions, which may result in distinct odour and degradation of lubricant; and Lubricant should have high temperature stability. Object of the Invention The principal object of the present invention, therefore, is to develop a lubricant composition including preparation thereof, suitable for post-lubrication of aluminium foils in the manufacture of Semi Rigid Containers. Composition The present invention accordingly provides a lubricant composition suitable for post-lubrication of aluminium foils, comprising : (a) about 90 to 98 parts by mass of a refined petroleum fraction forming base material for the composition, said refined petroleum fraction being paraffinic in nature and having a carbon chain length of 20 to 30 carbon atoms, paraffinic carbon content of at least 98% and kinematic viscosity of 10 to 20 mm2/s at 40°C (b) about 1.5 to 10 parts by mass of a straight chain fatty acid forming a first additive and having a carbon chain length of 10 to18 carbon atoms ; and (c) about 0.1 to 0.5 parts by mass of an inhibited phenolic compound forming a second additive, the three components (a), (b) and (c) being of IP or equivalent grade. It is advantageous if said refined petroleum fraction forming the base material is light liquid paraffin having a kinematic viscosity of 11-18 mm2/s at 40° C. The light liquid paraffin preferably has a kinematic viscosity at 40° C of 10 to 20 mm2/s. The said first additive may be preferably an aliphatic acid having a carbon chain length of 10 to 18 carbon atoms, and can be selected from dodecanoic acid and a mixture of dodecanoic acid and tetradecanoic acid. The second additive may be selected from butylated hydroxy toluene and butylated hydroxy anisole. In one preferred embodiment, the base material comprises 98 parts by mass of light liquid paraffin, the first additive comprises 1.9 parts by mass of dodecanoic acid, and the second additive comprises 0.1 part by mass of butylated hydroxy toluene. In a second embodiment, the base material comprises 95 parts by mass of light liquid paraffin, the first additive comprises 4.9 parts by mass of dodecanoic acid, and the second additive comprises 0.1 part by mass of butylated hydroxy toluene. In a third embodiment the base material comprises 90 parts by mass of light liquid paraffin, the first additive comprises 9.5 parts by mass a mixture of dodecanoic acid and tetradecanoic acid, and the second additive comprises 0.5 part by mass of butylated hydroxy toluene. The present invention also provides a method for the preparation of a lubricant composition suitable for post-lubrication of aluminium foils, said method comprising mixing (a) about 90 to 98 parts by mass of a refined petroleum fraction forming base material for the composition, said refined petroleum fraction being paraffinic in nature and having a carbon chain length of 20 to 30 carbon atoms, paraffinic carbon content of at least 98% and kinematic viscosity of 10 to 20 mm2/s at 40° C ; (b) about 1.5 to 10 parts by mass of a straight chain fatty acid forming a first additive and having a carbon chain length of 10 to 18 carbon atoms ; and (c) about 0.1 to 0.5 part by mass of an inhibited phenolic compound forming a second additive, the three components (a), (b) and (c) being of IP or equivalent grade and stirring, to form a homogeneous mixture. It is advantageous if the base material (a) and the first additive (b) are first mixed and stirred together, and the second additive (c) is thereafter mixed therewith, the entire mixture thereafter being stirred to form said homogeneous mixture. It may be noted that none of the above components can be used individually as lubricant for the post-lubricant of Semi Rigid Container foil. Reasons are : (i) The base material component (a) has lubricity, uniform film forming ability on aluminium foil surface ; but, it does not have adequate load bearing capacity needed during punching / forming operation. (ii) The first additive (b) has adequate lubricity and load bearing capacity; but, being solid, it does not have good adhesive property and, cannot form uniform layer of lubricant on the aluminium foil surface. (iii) The second additive (c) is not a lubricant; it is an anti-oxidant. But, it is essential in the composition to prevent any oxidation of components (a) and (b) and hence, prevent generation of unacceptable odour after post-lubrication of Semi Rigid Container Foil. Therefore, it is clear that none of the components mentioned above can be used individually as lubricant for post-lubrication of Semi Rigid Container foil suitable for making food containers. However, components (a), (b) & (c) can be used to formulate lubricant compositions for using as lubricant for the said purpose to get desired results. There is no chemical reaction taking place between the components while mixing and stirring. However, all the components, when formulated together, impart a synergistic effect for the composition to perform as good lubricant for post- lubrication of Semi Rigid Container foil suitable for making food containers. The lubricant composition, when used, provides good lubricity, leaving no patches of stains on the aluminium foil. The lubricant composition has good adhesive property and high temperature stability to prevent cracking or tearing of the aluminium foil. Although these components are of food grade the composition resists oxidation, hydrolysis and rancidity. Further, since the lubricant composition has low viscosity, it is possible to control thickness and uniformity. Also, the lubricant composition is odourless. Examples of typical lubricant formulation : Three lubricant compositions were formed. The components of the three formulations are given below: Component Composition 1 Composition 2 Composition 3 Component (a) 98 parts by mass 95 parts by mass 90 parts by mass Light Liquid Paraffin Light Liquid Paraffin Light Liquid Paraffin Component (b) 1.9 parts by mass 4.9 parts by mass 9.5 parts by mass of Dodecanoic Acid of Dodecanoic Acid of Dodecanoic Acid & Tetradecanoic Acid Mixture Component (c) 0.1 part by mass 0.1 part by mass 0.5 part by mass of Butylated Hydroxy of Butylated of Butylated Toluene Hydroxy Toluene Hydroxy Toluene All the above components are of IP or equivalent grade. Various formulations with the above components can be made to suit the needs of specific post-lubrication application. Out of the above examples, Composition 1 has been evaluated by actually using for post-lubrication of Semi Rigid Container foil followed by punching / forming operation. Component (a) and Component (b) are weighed accurately and thoroughly mixed by stirring to form a homogeneous mixture. To this, Component (c) is added and stirred till complete dissolution. This homogeneous solution is the said lubricant suitable for post-lubrication. Evaluation and Formulation The lubricant composition (Composition 1) was evaluated by actual application on Semi Rigid Container foil. For this purpose, aluminium foil having following characteristics was used : Alloy AA3003 Thickness 0.045 mm Width 885 mm Temper Soft. Outline of the process of lubrication is given below: Machine Lubricator Mechanism : Through Roller and control by Doctor Blade of Lubrication Mechanism Aluminium foil, in coil form, was used for applying lubricant. Lubrication was done on both the sides of the foil at the same time. Properties of foil after post-lubrication : (i) The lubrication content as 250 mg/m2 (ii) The lubricant film was uniform, no patches or stains (iii) No lubricant breakages were visible (iv) No odour of lubricant. This lubricated foil, after slitting into various small reels, was sent for punching/forming operation. Details of this operation are: Machine Four Cavity Machine Line Speed : 65 strokes per minute Container El 250 Specification The containers, after punching/deformation operations, were inspected for quality of deformation and oiliness. The results observed were : No cracks/breaks in the foils No odour on foil Foil surface - free from patches / stains. Thus, it is clear that the lubricant, prepared as per the formulation and preparation method thereof, described above, performs well as post-lubricant on Semi-rigid aluminium foils used in the manufacture of food containers. The lubricant composition of present invention possesses the following characteristics: (i) Lubricant composition is food grade ; (ii) Lubricant possesses good lubricity and good adhesive property; (iii) Lubricant is odourless ; (iv) Lubricant coating is uniform ; no patches or stains ; (v) Lubricant is resistant to oxidation. Therefore, it can be said that the lubricant formulation of present invention is not a mere admixture of components (a), (b) and (c), and that it has a synergistic effect when applied on Aluminium Semi Rigid foil. Also, there is no chemical reaction involved while mixing the lubricants. Although the invention has been described with reference to preferred embodiments, the present invention includes all modifications coming within the scope of the invention as hereinafter claimed. WE CLAIM: 1. A lubricant composition suitable for post-lubrication of aluminium foils, comprising: (a) about 90 to 98 parts by mass of a refined petroleum fraction forming base material for the composition, said refined petroleum fraction being paraffinic in nature and having a carbon chain length of 20 to 30 carbon atoms, paraffinic carbon content of at least 98% and kinematic viscosity of 10 to 20 mm2/s at 40°C ; (b) about 1.5 to 10 parts by mass of a straight chain fatty acid forming a first additive and having a carbon chain length of 10 to18 carbon atoms ; and (c) about 0.1 to 0.5 parts by mass of an inhibited phenolic compound forming a second additive, the three components (a), (b) and (c) being of IP or equivalent grade. 2. The lubricant composition as claimed in claim 1, wherein said refined petroleum fraction forming the base material is light liquid paraffin having a kinematic viscosity of 11 to 18 mm2/s at 40° C. 3. The lubricant composition as claimed in claim 1, wherein said refined petroleum fraction forming the base material is a light liquid paraffin having a kinematic viscosity at 40° C of 10 to 20 mm2/s. 4. The lubricant composition as claimed in any preceding claim, wherein said first additive is an aliphatic acid having a carbon chain length of 10 to 18 carbon atoms. 5. The lubricant composition as claimed in claim 4, wherein said first additive is selected from dodecanoic acid and a mixture of dodeeanoic acid and tetradecanoic acid. 6. The lubricant composition as claimed in any preceding claim, wherein said second additive is selected from butylated hydroxy toluene and butylated hydroxy anisole. 7. The lubricant composition as claimed in claim 1, wherein the base material comprises 98 parts by mass of light liquid paraffin ; the first additive comprises 1.9 parts by mass of dodecanoic acid ; and the second additive comprises 0.1 part by mass of butylated hydroxy toluene. 8. The lubricant composition as claimed in claim 1, wherein the base material comprises 95 parts by mass of light liquid paraffin ; the first additive comprises 4.9 parts by mass of dodecanoic acid ; and the second additive comprises 0.1 part by mass of butylated hydroxy toluene. 9. The lubricant composition as claimed in claim 1, wherein the base material comprises 90 parts by mass of light liquid paraffin ; the first additive comprises 9.5 parts by mass a mixture of dodecanoic acid and tetradecanoic acid ; and the second additive comprises 0.5 part by mass of butylated hydroxy toluene. 10. A method for the preparation of a lubricant composition suitable for post- lubrication of aluminium foils as claimed in any of the preceding claims, said method comprising mixing (a) about 90 to 98 parts by mass of a refined petroleum fraction forming base material for the composition, said refined petroleum fraction being paraffinic in nature and having a carbon chain length of 20 to 30 carbon atoms, paraffinic carbon content of at least 98% and kinematic viscosity of 10 to 20 mm2/s at 40°C ; (b) about 1.5 to 10 parts by mass of a straight chain fatty acid forming a first additive and having a carbon chain length of 10 to 18 carbon atoms; and (c) about 0.1 to 0.5 part by mass of an inhibited phenolic compound forming a second additive, the three components (a), (b) and (c) being of IP or equivalent grade and stirring, to form a homogeneous mixture. 11. The method as claimed in claim 10, wherein said refined petroleum fraction forming the base material is light liquid paraffin having a kinematic viscosity of 11 to 18 mm2/s at 40° C. 12. The method as claimed in claim 10, wherein said refined petroleum fraction forming the base material is a light liquid paraffin having a kinematic viscosity at 40° C of 10 to 20 mm2/s. 13. The method as claimed in any of claims 10-12, wherein said first additive is an aliphatic acid having a carbon chain length of 10 to 18 carbon atoms. 14. The method as claimed in claim 13, wherein said first additive is eleeted from dodecanoic acid and a mixture of dodecanoic acid and tetradecanoic acid. 15. The method as claimed in any of claims 10-14, wherein said second additive is selected from butylated hydroxy toluene and butylated hydroxy anisole. 16. The method as claimed in claim 10, wherein the base material comprises 98 parts by mass of light liquid paraffin ; the first additive comprises 1.9 parts by mass of dodecanoic acid ; and the second additive comprises 0.1 part by mass of butylated hydroxy toluene. 17. The method as claimed in claim 10, wherein the base material comprises 95 parts by mass of light liquid paraffin ; the first additive comprises 4.9 parts by mass of dodecanoic acid ; and the second additive comprises 0.1 part by mass of butylated hydroxy toluene. 18. The method as claimed in claim 10, wherein the base material comprises 90 parts by mass of light liquid paraffin ; the first additive comprises 9.5 parts by mass a mixture of dodecanoic acid and tetradecanoic acid ; and the second additive comprises 0.5 part by mass of butylated hydroxy toluene. 19. The method as claimed in any of claims 10 to 18, wherein the base material (a) and the first additive (b) are first mixed and stirred together, and the second additive (c) is thereafter mixed therewith, the entire mixture thereafter being stirred to form said homogeneous mixture. 20. A lubricant composition substantially as herein described, particularly with reference to the foregoing examples. 21. A method for the preparation of lubricant composition substantially as herein described, particularly with reference to the foregoing examples. Abstract LUBRICANT COMPOSITION FOR POST-LUBRICATION OF ALUMINIUM FOILS AND PROCESS FOR PREPARATION THEREOF A lubricant composition suitable for post-lubrication of aluminium foils, comprises: (a) about 90 to 98 parts by mass of a refined petroleum fraction forming base material for the composition, said refined petroleum fraction being paraffinic in nature and having a carbon chain length of 20 to 30 carbon atoms, paraffinic carbon content of at least 98% and kinematic viscosity of 10 to 20 mm2/s at 40°C ; (b) about 1.5 to 10 parts by mass of a straight chain fatty acid forming a first additive and having a carbon chain length of 10 to 18 carbon atoms ; and (c) about 0.1 to 0.5 parts by mass of an inhibited phenolic compound forming a second additive, the three components (a) (b) and (c) being of IP or equivalent grade. |
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00796-kol-2007-correspondence others.pdf
00796-kol-2007-description complete.pdf
796 kol 2007 search report[1].pdf
796-KOL-2007-(05-09-2012)-ABSTRACT.pdf
796-KOL-2007-(05-09-2012)-AMANDED CLAIMS.pdf
796-KOL-2007-(05-09-2012)-DESCRIPTION (COMPLETE).pdf
796-KOL-2007-(05-09-2012)-EXAMINATION REPORT REPLY RECEIVED.pdf
796-KOL-2007-(05-09-2012)-FORM-1.pdf
796-KOL-2007-(05-09-2012)-FORM-2.pdf
796-KOL-2007-CORRESPONDENCE.pdf
796-KOL-2007-EXAMINATION REPORT.pdf
796-KOL-2007-GRANTED-ABSTRACT.pdf
796-KOL-2007-GRANTED-CLAIMS.pdf
796-KOL-2007-GRANTED-DESCRIPTION (COMPLETE).pdf
796-KOL-2007-GRANTED-FORM 1.pdf
796-KOL-2007-GRANTED-FORM 2.pdf
796-KOL-2007-GRANTED-SPECIFICATION-COMPLETE.pdf
796-KOL-2007-REPLY TO EXAMINATION REPORT.pdf
Patent Number | 256233 | |||||||||
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Indian Patent Application Number | 796/KOL/2007 | |||||||||
PG Journal Number | 21/2013 | |||||||||
Publication Date | 24-May-2013 | |||||||||
Grant Date | 20-May-2013 | |||||||||
Date of Filing | 23-May-2007 | |||||||||
Name of Patentee | HINDALCO INDUSTRIES LIMITED | |||||||||
Applicant Address | 1 MIDDLETON STREET, CALCUTTA 700 071, WEST BENGAL | |||||||||
Inventors:
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PCT International Classification Number | C10M161/00 | |||||||||
PCT International Application Number | N/A | |||||||||
PCT International Filing date | ||||||||||
PCT Conventions:
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