Disclosed herein are process for removing color bodies from an organic solution comprising guayule resin. The processes include the use of activated carbon.

Disclosed herein are process for removing color bodies from an organic solution comprising guayule resin. The processes include the use of activated carbon.

Provided herein is a fractionator and related process for separating solubilized rubber from a co-solvent based miscella.

Provided are a rubber composition for tires that shows a balanced improvement in properties such as fuel economy, processability, heat aging resistance, abrasion resistance, wet-grip performance, performance on snow and ice, and handling stability, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for tires, containing: a highly purified, modified natural rubber having a pH adjusted to 2-7; carbon black and/or a white filler; and a silane coupling agent represented by the following Formula (S1): ##STR00001##
wherein R.sup.1001 represents a monovalent group selected from —Cl, —Br, —OR.sup.1006, —O(O═)CR.sup.1006, —ON═CR.sup.1006R.sup.1007, —ON═CR.sup.1006R.sup.1007, —NR.sup.1006R.sup.1007, and —(OSiR.sup.1006R.sup.1007).sub.h(OSiR.sup.1006R.sup.1007R.sup.1008), wherein R.sup.1006, R.sup.1007, and R.sup.1008 are the same as or different from one another and each represent a hydrogen atom or a C1-C18 monovalent hydrocarbon group, and h represents a number whose average value is 1 to 4; R.sup.1002 represents R.sup.1001, a hydrogen atom, or a C1-C18 monovalent hydrocarbon group; R.sup.1003 represents R.sup.1001, R.sup.1002, a hydrogen atom, or the group: —[O(R.sup.1009O).sub.j].sub.0.5— wherein R.sup.1009 represents a C1-C18 alkylene group, and j represents an integer of 1 to 4; R.sup.1004 represents a C1-C18 divalent hydrocarbon group; R.sup.1005 represents a C1-C18 monovalent hydrocarbon group; and x, y, and Z are numbers satisfying the following relationships: x+y+2z=3, 0≦x≦3, 0≦y≦2, and 0≦z≦1.

Provided are a rubber composition for tires that shows a balanced improvement in properties such as fuel economy, processability, heat aging resistance, abrasion resistance, wet-grip performance, performance on snow and ice, and handling stability, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for tires, containing: a highly purified, modified natural rubber having a pH adjusted to 2-7; carbon black and/or a white filler; and a silane coupling agent represented by the following Formula (S1): ##STR00001##
wherein R.sup.1001 represents a monovalent group selected from —Cl, —Br, —OR.sup.1006, —O(O═)CR.sup.1006, —ON═CR.sup.1006R.sup.1007, —ON═CR.sup.1006R.sup.1007, —NR.sup.1006R.sup.1007, and —(OSiR.sup.1006R.sup.1007).sub.h(OSiR.sup.1006R.sup.1007R.sup.1008), wherein R.sup.1006, R.sup.1007, and R.sup.1008 are the same as or different from one another and each represent a hydrogen atom or a C1-C18 monovalent hydrocarbon group, and h represents a number whose average value is 1 to 4; R.sup.1002 represents R.sup.1001, a hydrogen atom, or a C1-C18 monovalent hydrocarbon group; R.sup.1003 represents R.sup.1001, R.sup.1002, a hydrogen atom, or the group: —[O(R.sup.1009O).sub.j].sub.0.5— wherein R.sup.1009 represents a C1-C18 alkylene group, and j represents an integer of 1 to 4; R.sup.1004 represents a C1-C18 divalent hydrocarbon group; R.sup.1005 represents a C1-C18 monovalent hydrocarbon group; and x, y, and Z are numbers satisfying the following relationships: x+y+2z=3, 0≦x≦3, 0≦y≦2, and 0≦z≦1.

The present invention relates to an integrated process for processing and utilising every part of the guayule plant (Parthenium argentatum) which comprises the following steps in sequence: separating the stem and branches (3) from the leaves (2) of said plant with a mechanical treatment (1); treating the leaves (100) to produce waxes and essential oils (102), and a fraction (101) containing cellulose, hemicellulose (carbohydrates) and, to a minor extent, salts, organic compounds and lignin; extracting (200) from the stem and branches a liquid phase (4), so forming a first solid woody residue (5), indicated with bagasse in the present text; treating said first solid woody residue (5) to prepare sugars, resin, rubber and lignin.

An extractor suitable for using a solvent to separate a compound from a solid or semisolid substance containing the compound. The extractor includes a conveying assembly having an inclined conveyor for receiving the substance from a substance inlet and moving the substance through the solvent, an inclined upper surface associated with the first conveyor and an inclined lower surface associated with the first conveyor. The conveyor is configured to move the substance downward through the solvent along the upper surface toward a lower end of the conveyor and upward through the solvent along the lower surface toward an upper end of the conveyor.

An extractor suitable for using a solvent to separate a compound from a solid or semisolid substance containing the compound. The extractor includes a conveying assembly having an inclined conveyor for receiving the substance from a substance inlet and moving the substance through the solvent, an inclined upper surface associated with the first conveyor and an inclined lower surface associated with the first conveyor. The conveyor is configured to move the substance downward through the solvent along the upper surface toward a lower end of the conveyor and upward through the solvent along the lower surface toward an upper end of the conveyor.

Provided is a method for producing purified chloroprene-based-polymer latex which enables efficiently removing a residual volatile organic substance from chloroprene-based-polymer latex while suppressing foaming and the deposition of aggregates. The method for producing purified chloroprene-based-polymer latex of the present invention has at least the following steps (I) to (III):

Step (I): a step of introducing chloroprene-based-polymer latex into a container beforehand,
Step (II): a step of removing a residual volatile organic substance in the chloroprene-based-polymer latex which satisfies specific requirements (1) to (4), and
Step (III): a step of collecting the latex from the container after performing the step (II) at least once, to thereby obtain purified chloroprene-based-polymer latex.

Provided is a method for producing purified chloroprene-based-polymer latex which enables efficiently removing a residual volatile organic substance from chloroprene-based-polymer latex while suppressing foaming and the deposition of aggregates. The method for producing purified chloroprene-based-polymer latex of the present invention has at least the following steps (I) to (III):

Step (I): a step of introducing chloroprene-based-polymer latex into a container beforehand,
Step (II): a step of removing a residual volatile organic substance in the chloroprene-based-polymer latex which satisfies specific requirements (1) to (4), and
Step (III): a step of collecting the latex from the container after performing the step (II) at least once, to thereby obtain purified chloroprene-based-polymer latex.