Inner liner of pneumatic tire

Abstract

The present invention provides an inner liner of pneumatic tires that is formed from a non-drawn film of a polymer composition including 60 to 90 wt.% of a thermoplastic resin and 10 to 40 wt.% of an elastomer to have an oxygen permeation rate of less than 15*10-3 ccm / m2.24hratm, and a fracture elongation of more than 200% at the room temperature. The tire thus manufacture has no fracture under a severe deformation during the tire shaping process, facilitating the tire manufacture, and exhibits an air permeation preventive property as an excellent air permeation preventive layer.

Description

technical field [0001] The present invention relates to pneumatic tire innerliners. More specifically, the present invention relates to an inner liner comprising a thermoplastic resin and an elastomer. Background technique [0002] The most important issue facing the automotive industry is reducing the rate of fuel consumption. There is an increasing need to reduce the weight of tires. [0003] Currently, the inside of the tire has an inner liner or barrier layer made of halobutyl rubber or another rubber with low air permeability. [0004] However, the halogenated butyl rubber used as an inner liner or an air-permeable layer has high hysteresis loss, causing ripples on the inner rubber of the carcass layer and the air-permeable layer after the tire is vulcanized, so that the carcass layer and the air-proof layer are deformed. This results in increased rolling resistance. [0005] As a solution to this problem, a rubber sheet called "tie rubber" having low hysteresis lo...

AI Technical Summary

Problems solved by technology

[0009] However, if used in an inner liner or another layer of air barrier, thermoplastic multilayer films have low elongation to repeated deformation in use, resulting in a large number of cracks in it, and thus a decrease in air tightness

[0010] In conventional tire manufacturing methods that require an innerliner molding step, commercially available thermoplastic films suffer from directional crystallization by stretching and thermal crystallization by thermosetting after stretching and annealing treatments, thereby affecting the Deformed with low elongation, resulting in cracking

In summary, conventional manufacturing methods do not enable the manufacture of tires from commercially available thermoplastic films