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US 12,447,704 B2Granted
Method for vulcanizing a green tire using an organopolysiloxane-based mold release agent lubricant composition
AssigneeElkem Silicones France SAS
InventorsMichel Feder, Stefan Breunig
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Abstract
A method is described for vulcanizing a green tire using an organopolysiloxane-based mold release agent lubricant composition. Also described, is an organopolysiloxane-based mold release agent lubricant composition.
Claims23
A colored lubricant mold-release composition (I) comprising:
- a. at least one organopolysiloxane (A);
- selected from the group consisting of:
- non-reactive organopolysiloxanes (E) which, per molecule, comprise monovalent organic substituents, that are identical or different, bonded to the silicon atoms, and that are selected from the group consisting of C1-C40 alkyl, C3-C8 cycloalkyl, C6-C10 aryl and C7-C50 alkylaryl radicals;
- reactive organopolysiloxanes (F) including at least two ≡SiOH silanol groups per molecule;
- and mixtures thereof,
- b. at least one surfactant (B),
- c. at least one non-fluorescent pigment (C) selected from the group consisting of, according to the color Index classification:
- monoazo, disazo, amino ketone, indigoid, phthalocyanine, oxazine, and mixtures thereof;
- and
- d. water (D);
- wherein amounts of the surfactant(s) and the water are sufficient to obtain an oil-in-water emulsion such that the colored lubricant mold-release composition (I) is in the form of an oil-in-water emulsion.
8 more elements
A process of vulcanizing a green tire in a metal press using an expandable rubber bladder, the process comprising the following steps:
- 1. coating an inside surface of the green tire and/or an outside surface of the expandable rubber bladder with a colored lubricant mold-release composition (I), in the form of an oil-in-water emulsion, to form a colored coating that is visible to the naked eye on the green tire and/or on the bladder, the lubricant composition (I) comprising:
- a. at least one organopolysiloxane (A) selected from the group consisting of:
- non-reactive organopolysiloxanes (E) which, per molecule, comprise monovalent organic substituents, that are identical or different, bonded to the silicon atoms, and that are selected from the group consisting of C1-C40 alkyl, C3-C8 cycloalkyl, C6-C10 aryl and C7-C50 alkylaryl radicals;
- reactive organopolysiloxanes (F) including at least two=SiOH silanol groups per molecule;
- and mixtures thereof;
- b. at least one surfactant (B);
- c. at least one non-fluorescent pigment (C) selected from the group consisting of, according to the color Index classification:
- monoazo, disazo, amino ketone, indigoid, phthalocyanine, oxazine, and mixtures thereof;
- and
- d. water (D);
- wherein amounts of the surfactant(s) and the water are sufficient to obtain the oil-in-water emulsion such that the colored lubricant mold-release composition (I) is in the form of an oil-in-water emulsion;
- 2. inflating the bladder and vulcanizing the tire in the metal press;
- and
- 3. demolding the tire;
- wherein an interior of the tire obtained in step 3) no longer has any coloring that is visible to the naked eye.
12 more elements
Dependencies are inferred from the claim text.