Tokyo Commodity Exchange (TOCOM) futures, which set the tone for rubber prices in Southeast Asia, continued to fall over worries on slowing global economy. The benchmark Tokyo Commodity Exchange (TOCOM) rubber contract for August delivery finished 5.9 yen ($0.0536) lower at 183.9 yen per kg. The most-active rubber contract on the Shanghai futures exchange for May delivery fell 355 yuan ($52.91) to finish at 11,500 yuan per tonne.
The drop also came as Thailand, the world's top natural rubber producer, was expected to delay the start of planned curbs on exports of the commodity by over a month.
TOCOM's technically specified rubber (TSR) 20 futures contract for September delivery closed down 4.6 yen at 162.9 yen per kg.
The front-month rubber contract on Singapore's SICOM exchange for April delivery last traded at 146.4 US cents per kg, down 1.2 percent.
The US dollar was quoted around 110.21 yen, compared with around 109.91 yen on Friday afternoon.
Oil prices slipped on Monday, with concerns of a sharp economic slowdown outweighing supply disruptions from Opec's production cutbacks and from US sanctions on Iran and Venezuela.
Japan's benchmark Nikkei stock average was down 3.01 percent.