RUBBER MIXTURE FOR MANUFACTURE OF SHOCK-ABSORBING LAYERS FOR RAIL FASTENERS TO BE SECURED UNDER RAILS AND ON SLEEPERS Russian patent published in 2006 - IPC C08L9/00 C08L9/06 C08K13/02 C08K3/04 C08K3/06 C08K3/22 C08K5/01 C08K5/03 C08K5/09 C08K5/43 C08K5/44 

FIELD: production of rubber articles from rubber mixtures for manufacture of frost-resistant shock-absorbing rail fasteners.

SUBSTANCE: rubber mixture is produced by mixing of butadiene- styrene rubber having 22-25 weight parts of styrene, and synthetic cis 1,4-polyisopropene rubber of curing group, consisting of sulfur, N-cyclohexyl-2-benzthiazolyl sulphenamide, melt of w, w'-hexachlorparaxylene in shielding wax and N, N'-dithiodimorpholine, zinc oxide, synthetic fatty acids of C₁₇-C₂₀ fraction, N-phenyl-N'-isopropyl-n-phenylenediamine, petroleum bitumen, kaolin, technical-grade carbon, age resistor and plasticizer. Mixture additionally contains divinyl rubber with cis 1,4 link content of from 85 to 95 wt%, Vaseline oil and polymerized 2,2,4-trimethyl 1,2-dihydroquinoline.

EFFECT: increased frost resistance and improved resistance to formation and development of cracks.

3 tbl