Patent ID: 8544517
Filing Date: 2013-10-01
Classification: B32B,B60C,Y10T

Abstract:
1. A multi-layered air permeation preventing layer of pneumatic tires comprising: an inner liner layer of a non-drawn film formed from polymer composition comprising 80 to 90 wt. % of a thermoplastic resin and 10 to 20 wt. % of an elastomer; and carcass rubber layers having the same composition are adhered to the outside and inside of the non-drawn film, wherein the multi-layered air permeation preventing layer has a −50° C. to −10° C. of a steep decreasing range of an elastic modulus, wherein the elastic modulus at the steep decreasing range of −50° C. and −10° C. satisfies the following equation 1: wherein the E′ wherein, the non-drawn film is a non-vulcanized film, wherein the thermoplastic resin is a polyamide resin and the elastomer is a polyamide elastomer, wherein the thickness of the carcass rubber layer adhered to the inside of the non-drawn film is 1 to 5 mm, and wherein the non-drawn film has a fracture elongation of more than 200% at the room temperature and a yield point of more than 10% at −35° C.