LUBRICANT COMPOSITION FOR INDUSTRIAL GEARING COMING INTO CONTACT WITH FOOD

Abstract

The invention relates to a lubricant composition comprising: at least one base oil for coming into contact with food, selected from the groups II, III or V according to the categories defined in the API classification or the equivalents thereof according to the ATIEL classification; at least one hydrogenated polyisobutylene; and at least one ester polymer.

Claims

1. Lubricant composition comprising: at least one base oil for food contact, chosen from groups II, III or V according to the classes defined in the API classification or their equivalents according to the ATIEL classification; at least one hydrogenated polyisobutylene; at least one ester polymer chosen from ester copolymers comprising a hydrocarbon backbone, hydrocarbon pendant groups and ester pendant groups.

2. Lubricant composition of claim 1, wherein the base oil is selected from the group of food contact base oils selected from group II.

3. Lubricant composition according to claim 1, wherein the base oil is selected from white oils.

4. Lubricant composition according to claim 1, wherein the hydrogenated polyisobutylene is selected from hydrogenated polyisobutylenes with a molar mass of between 400 and 2000.

5. Lubricant composition according to claim 1, wherein the ester polymer is selected from the copolymers of alpha-olefin and polycarboxylic acid esterified with alcohols.

6. Lubricant composition according to claim 1, comprising at least 38%, preferably at least 40%, by weight of hydrogenated polyisobutylene, preferably at least 45% by weight, relative to the total weight of the lubricant composition.

7. Lubricant composition according to claim 1, comprising at least 1% by weight of ester polymer, preferably between 1 and 20%, preferably between 2 and 10%, preferably at least 5%, preferably between 5 and 20%, preferably between 5 and 10% by weight, relative to the total weight of lubricant composition.

8. Lubricant composition according to claim 1 having a pour point of less than 24 C.

9. Lubricant composition according to claim 1 having a kinematic viscosity at 40 C. measured according to ISO 3104 between 500 and 2000 mm.sup.2/s.

10. Method of lubrification of gearing comprising the step of putting into contact the lubricating composition according to claim 1 with the gear.

Description

COMPOUNDS IMPLEMENTED IN THE EXAMPLES

[0048]

TABLE-US-00002 Chemical Molar mass KV40 Pour point Component nature (Mn) (mm.sup.2/s) ( C.) Finavestan White oil 65.80 12 A360B Finavestan A80B White oil 15.90 9 Indopol H300 Hydrogenated 1300 4 polyisobutylene Ketjenlube 240 Polymer ester 6 Synesstic 5 Synthetic 33 base oil (naphthalene derivative) Indopol H25 Hydrogenated 635 22 polyisobutylene Indopol H7 Hydrogenated 440 34 polyisobutylene Lubrizol 3130A Hydrogenated 3 polyisobutylene Irgalube 232 Anti-wear phospho-sulfur antifoam mixture of antioxidants, anti- wear and anti- corrosion agents

[0049] The molar mass Mn of the hydrogenated polyisobutadiene is measured by gel permeation chromatography (derived from ASTM D3536).

[0050] The kinematic viscosity at 40 C. is measured according to ISO 3104.

[0051] The viscosity index is measured according to the ISO 2909 standard.

[0052] The pour point is measured according to ISO 3016.

Compositions

Comparative Compositions (White Oil+Hydrogenated Polyisobutadiene)

[0053]

TABLE-US-00003 CC1 CC2 CC3 FINAVESTAN A360B 63.8 56.4 50.5 INDOPOL H300 36.2 43.6 49.5 Kinematic viscosity at 40 C. 470.3 690.5 1005 (mm.sup.2/s) Viscosity index 112 115 116 Pour point ( C.) 18 21 21

[0054] These lubricant compositions which only include the combination of food contact oil and PIB do not have the expected characteristics in terms of pour point and therefore in terms of resistance at low temperatures.

TABLE-US-00004 FINAVESTAN A360B 36.6 27.3 INDOPOL H300 51.2 50.5 KETJENLUBE 240 5 10 SYNESSTIC 5 5 10 Antioxidant and anticorrosive 1.5 1.5 mixtures IRGALUBE 232 0.4 0.4 antifoam 0.3 0.3 TOTAL 100 100 Kinematic viscosity at 40 C. 994.4 1003 (mm.sup.2/s) Viscosity index 122 123 Pour point ( C.) 24 30 FINAVESTAN A360B 46.5 46.5 45 45 FINAVESTAN A80B 46.5 INDOPOL H300 48.5 48.5 INDOPOL H1200 INDOPOL H2100 LUBRIZOL 3130A 48.5 INDOPOL H25 50 INDOPOL H7 50 KETJENLUBE 240 5 5 5 5 5 Pour point ( C.) 33 24 24 27 33

[0055] These results show that the specific combination of the invention of a incidental food contact oil (excluding PAO) with a PIB and an ester polymer makes it possible to obtain a lubricant composition: [0056] meeting the criteria for incidental food contact; [0057] having a high viscosity; [0058] having a low pour point and therefore good performance at low or very low temperatures.

[0059] In a particularly surprising manner, with respect to the compositions CC1, CC2 and CC3, the addition of a relatively high pour point ester polymer makes it possible to greatly reduce the final pour point of the lubricant composition and thus to improve its behavior at low, even very low temperatures.