Lubricant for transport of P.E.T. containers
AssigneeDespo Chemicals International, Inc.
InventorAris D. Despo
Life of this patent
Estimating the term…
Abstract
The invention relates to compositions, methods and processes of dilutable aqueous conveyor lubricant concentrates and to the use of the lubricant compositions especially as lubricants for the transport of P.E.T. containers, i.e., containers made of ethylene terephthalate homopolymers, copolymers and mixtures thereof. The aqueous lubricant concentrate compositions (pH 9.0-10.5) contain fatty acid, alkyl phosphate ester and alkyl aryl phosphate esters, which serve the dual role as emulsifying agent and stress crack inhibitor, in the presence of potassium hydroxide as the saponifying agent and in combinations with typical coupling/hydrotrope and chelating agents; and optional inorganic phosphate.
Claims20
An aqueous conveyor lubricant concentrate capable of being diluted with water for applying to the exterior of P.E.T. containers being transported along a conveyor system comprising:
- (a) a long chain fatty acid;
- (b) emulsifying agent;
- (c) stress crack inhibiting agent;
- which is an alkyl aryl phosphate ester or an alkyl phosphate ester;
- (d) saponifying agent;
- (e) sequestrant;
- (f) coupling agent/hydrotope;
- (g) water;
- and
- (h) optionally, an inorganic phosphate
- wherein the pH of said concentrate is in the range of 9 to 10.5.
A method of inhibiting stress cracking in P.E.T. containers comprising the step of applying a dilute aqueous fatty acid soap based lubricant use solution to the exterior of the P.E.T. container, wherein the pH of the concentrate from which the use solution is made is in the range of 9 to 10.5, the use solution comprising a stress cracking inhibitor which is a compound of one or more of the alkyl aryl phosphate ester and alkyl phosphate ester singly or in combination.
A method of inhibiting stress cracking on a poly(ethylene terephthalate) article, comprising the step of applying to said article a soap based composition consisting essentially of a free phosphoric acid or potassium salt of an alkyl aryl phosphate ester in the presence of an alkali metal hydroxide.
A method of inhibiting stress cracking on a poly(ethylene terephalate) article comprising the step of applying to said article a soap based composition consisting essentially of a free phosphoric acid or potassium salt of an alkyl phosphate ester in the presence of an alkali metal hydroxide.
An aqueous conveyor lubricant concentrate composition for P.E.T. containers moving on a conveyor system comprising:
- (a) Water present in the amount between 32 to 70 percent, by weight, based on the total concentrate weight;
- and
- (b) A fatty acid mixture of tall oil fatty acid present in an amount between 6 to 22 percent by weight of the total concentrate;
- and
- (c) As stress crack inhibitors, polyoxyethylene dinonylphenyl ether phosphate, polyoxyethylene decyl ether phosphate and polyoxyethylene nonylphenyl ether phosphate, present in an amount between 0.5 to 9.0 percent, by weight, of the total concentrate;
- and
- (d) As emulsifiers, polyoxyethylene decyl ether phosphate, polyoxyethylene dinonylphenyl ether phosphate, polyoxyethylene nonylphenyl ether phosphate, ethoxylated nonylphenol, ethoxylated dinonylphenol, and ethoxylated tridecyl alcohol, present in an amount between 0.5 to 12 percent, by weight, of the total concentrate;
- and
- (e) Potassium hydroxide present in the amount of 2 to 10 percent, by weight, based on the total concentrate weight;
- and
- (f) Sequestrant agent present in the amount between 6 to 15 based on the total concentrate weight;
- and
- (g) Coupling/hydrotrope agent present in the amount between 3 to 27 percent based upon the total concentrate weight;
- and
- (h) Optional inorganic phosphate present in the amount between 0.2 to 6 percent of the total concentrate weight.
In a process comprising lubricating continuous conveyors of P.E.T. vessels for containing food or beverages, the improvement wherein the lubricant concentrate used is an aqueous lubricant composition having a pH value in the range from about 9.0 to 10.5, and comprises 32 to 70 percent of water by weight of the total composition and:
- (a) From about 0.5 to 9.0 percent by weight of the total composition comprising at least one compound of the formulas (I) or (II):
- R.sub.1 --O--[CH.sub.2 CH.sub.2 --O]n--PO.sub.3 X.sub.2 (I)
- in which R.sub.1 is a linear or branched saturate primary alkyl group, C8 to C12, X is hydrogen and/or an alkali metal, and n is an integer in the range from about 3 to 10:
- R.sub.2 R.sub.3 --C.sub.6 H.sub.3 --O[--CH.sub.2 CH.sub.2 --O]n--P O.sub.3 X.sub.2 (II)
- in which R.sub.2 is linear or branched saturated primary alkyl groups, containing 8 to 12 carbon atoms, R.sub.3 is hydrogen, or linear or branched saturated primary alkyl groups containing 8 to 10 carbon atoms, X is hydrogen and/or an alkali metal, and n is an integer in the range from 4 to about 10 and
- (b) From about 6 to 22 percent, by weight, of the total composition of molecules selected from the group of a long-chain fatty acid consisting of carboxylic acid having from about 12 to 22 carbon atoms in the alkyl portion thereof;
- and
- (c) From about 0.5 to 12 percent of the emulsifying agent by weight of total composition;
- and
- (d) From about 2 to 10 percent, of the saponifying agent by weight of total composition;
- and, optionally,
- (e) Conventional sequestering agent, coupling/hydrotrope agent, optional inorganic phosphate, or mixtures thereof.
Dependencies are inferred from the claim text.