C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/639
C08J 9/22 (2006.01) B29C 44/34 (2006.01)
Patent
CA 1266754
Abstract of the Disclosure 1. In a process for pre-expanding thermoplastic resin particles which comprises releasing into a low pressure zone a mixture of water and thermoplastic resin particles containing a volatile blowing agent, the mixture being maintained at an elevated temperature under pressure in a pressure vessel, the improvement which comprises releasing the mixture through a plurality of orifice plates in series to the direction of releasing the mixture. According to the process of the present invention, the average cell diameter of the obtained pre-expanded particles is larger than that of the pre-expanded particles obtained by means of conventional methods. Therefore, the molded articles prepared from the pre-expanded particles according to the present invention are small in shrinkage and excellent in surface appearance, and are utilizable for use of shock absorbing, wrapping materials or structural materials such as impact-absorbing materials for cars (for example, a car bumper), which requires excellent dimentional precision and heat insulating builting materials.
540549
Nakamura Kyoichi
Yoshida Hiroyuki
Kanegafuchi Kagaku Kogyo Kabushiki Kaisha
Osler Hoskin & Harcourt Llp
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