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Title:
ELASTIC COATING AGENT FOR DIRECTLY COUPLED SLEEPER
Document Type and Number:
Japanese Patent JPS6197317
Kind Code:
A
Abstract:

PURPOSE: The title coating agent excellent in vibration isolation, attenuation, absorption and damping effects, comprising a foaming stock solution containing three specified polyols, an organic polyisocyanate, a chain extender, a blowing agent and a urethane formation catalyst.

CONSTITUTION: An elastic coating agent comprising a low-expansion ratio urethane bond-containing elastomer of a bulk density of 0.4W0.75g/cm3, prepared from a foaming stock solution comprising a polyether-polyol (a) of an average functionality of 2.5W4.5 and a number-average MW of 2,000W3,500, a vinyl monomer-grafted polyol (b) of an average functionality of 2.5W4.0 and a degree of grafting of 4W20wt%, a liquid, hydroxyl-terminated polybutadiene-polyol (c) of an average functionality of 2.0W3.0 and a number-average MW of 2,000W7,000, an organic polyisocyanate (d), a chain extender (e), a blowing agent (f) and a urethane formation catalyst (g), said foaming stock solution having an NCO index of 90W110 and containing said chain extender at a concentration of 0.3×10-3W1.5×10-3mol/g, based on the total of the five component, a, b, c, d and e.


Inventors:
Motomiya, Tatsuya
Suzuki, Toshio
Ogawa, Yoshihiko
Sato, Yoshihiko
Oishi, Fujio
Application Number:
JP1984000217415
Publication Date:
May 15, 1986
Filing Date:
October 18, 1984
Export Citation:
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Assignee:
NISSHINBO IND INCJAPANESE NATIONAL RAILWAYS
International Classes:
C08G18/00; C08G18/48; C08G18/63; C08G18/69; C09D175/06; C09D175/14; E01B3/44; (IPC1-7): C08G18/63; C08G18/69