Crumb rubber obtained from recycled tires is subjected to an interlinked substitution process. The process utilizes a reactive component that interferes with sulfur bonds. The resulting treated rubber exhibits properties similar to those of the virgin composite rubber structure prior to being granulated, and is suitable for use in fabricating new tires, engineered rubber articles, and asphalt rubber for use in waterproofing and paving applications.

A rubber composition has a rubber component and recycled carbon black. The recycled carbon black has an ash content of 13% by mass or more. The rubber composition preferably further has a silane coupling agent. The rubber composition preferably has a content of the recycled carbon black of 5 to 60 parts by mass based on 100 parts by mass of a total amount of the rubber component.

A rubber composition has a rubber component and recycled carbon black. The recycled carbon black has an ash content of 13% by mass or more. The rubber composition preferably further has a silane coupling agent. The rubber composition preferably has a content of the recycled carbon black of 5 to 60 parts by mass based on 100 parts by mass of a total amount of the rubber component.

The polyisoprene-containing latex composition of the present it comprises the following components (a) and (b): (a) zinc ethylphenyldithiocarbamate; and (b) 1-o-tolylbiguanide. Thus, a molded article of the latex composition has high tensile strength. Further, even after the latex composition is stored for a longer period of time than before, a decrease in the tensile strength of the obtained molded article is suppressed.

The polyisoprene-containing latex composition of the present it comprises the following components (a) and (b): (a) zinc ethylphenyldithiocarbamate; and (b) 1-o-tolylbiguanide. Thus, a molded article of the latex composition has high tensile strength. Further, even after the latex composition is stored for a longer period of time than before, a decrease in the tensile strength of the obtained molded article is suppressed.

The subject matter described herein relates to methods for polymer xanthylation and the xanthylated polymers produced by such methods. Subsequent replacement of the xanthylate moiety allows facile entry into functionalized polymers.

To provide a polychloroprene latex from which a dip-formed film that is excellent in mechanical properties while having flexibility can be obtained. The polychloroprene latex is a mercaptan-modified polychloroprene latex comprising polychloroprene that is a copolymer of chloroprene and 2,3-dichloro-1,3-butadiene, wherein in a solid state 13C NMR spectrum of the polychloroprene obtained by freeze-drying the mercaptan-modified polychloroprene latex, an area (A) of a peak at 126.2 to 127.6 ppm, an area (B) of a peak at 122.0 to 126.2 ppm and an area (C) of a peak at 129.9 to 130.3 ppm are in the ranges represented by the following expression (I), an amount of the 2,3-dichloro-1,3-butadiene copolymerized is 4 to 35% by mass per 100% by mass in total of the chloroprene and the 2,3-dichloro-1,3-butadiene contained in the polychloroprene, and a toluene-insoluble content of the polychloroprene is 50 to 100% by mass in 100% by mass of the polychloroprene.

[00001]$\begin{array}{cc}\frac{4.0}{100}\leqq \frac{A}{B-C}\leqq \frac{5.8}{100}& \left(I\right)\end{array}$

To provide a polychloroprene latex from which a dip-formed film that is excellent in mechanical properties while having flexibility can be obtained. The polychloroprene latex is a mercaptan-modified polychloroprene latex comprising polychloroprene that is a copolymer of chloroprene and 2,3-dichloro-1,3-butadiene, wherein in a solid state 13C NMR spectrum of the polychloroprene obtained by freeze-drying the mercaptan-modified polychloroprene latex, an area (A) of a peak at 126.2 to 127.6 ppm, an area (B) of a peak at 122.0 to 126.2 ppm and an area (C) of a peak at 129.9 to 130.3 ppm are in the ranges represented by the following expression (I), an amount of the 2,3-dichloro-1,3-butadiene copolymerized is 4 to 35% by mass per 100% by mass in total of the chloroprene and the 2,3-dichloro-1,3-butadiene contained in the polychloroprene, and a toluene-insoluble content of the polychloroprene is 50 to 100% by mass in 100% by mass of the polychloroprene.

[00001]$\begin{array}{cc}\frac{4.0}{100}\leqq \frac{A}{B-C}\leqq \frac{5.8}{100}& \left(I\right)\end{array}$

The present invention relates to a modified conjugated diene-based polymer, and more particularly, provides a modified conjugated diene-based polymer including a repeating unit derived from a conjugated diene-based monomer and a functional group derived from a modifier containing a compound represented by Formula 1 at one terminal, and a method of preparing the same.

The present invention relates to a modified conjugated diene-based polymer, and more particularly, provides a modified conjugated diene-based polymer including a repeating unit derived from a conjugated diene-based monomer and a functional group derived from a modifier containing a compound represented by Formula 1 at one terminal, and a method of preparing the same.