Title of Invention

LUBRICANT COMPOSITION FOR POST-LUBRICATION OF ALUMINIUM FOILS AND PROCESS FOR PREPARATION THEREOF

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.

Documents:

00796-kol-2007-abstract.pdf

00796-kol-2007-claims.pdf

00796-kol-2007-correspondence others.pdf

00796-kol-2007-description complete.pdf

00796-kol-2007-form 1.pdf

00796-kol-2007-form 2.pdf

00796-kol-2007-form 3.pdf

00796-kol-2007-gpa.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-ASSIGNMENT.pdf

796-KOL-2007-CORRESPONDENCE.pdf

796-KOL-2007-EXAMINATION REPORT.pdf

796-kol-2007-form 18.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-PA.pdf

796-KOL-2007-REPLY TO EXAMINATION REPORT.pdf


Patent Number 256233
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:
# Inventor's Name Inventor's Address
1 VENKATESH KRISHNAN HINDALCO INDUSTRIES LIMITED TALOJA R&D CENTRE, PLOT NO.2, P.B.NO.5, TALOJA AV 410208 NAVI MUMBAI
2 KADU NILESH PANDURANG HINDALCO INDUSTRIES LIMITED TALOJA R&D CENTRE, PLOT NO.2, P.B.NO.5, TALOJA AV 410208 NAVI MUMBAI
PCT International Classification Number C10M161/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA 2007-05-23 Not Applicable