Patent ID: 8656973

Claim:
An inner liner of a polymer laminate comprising: a first layer composed of a polymer composition including a polymer component containing more than or equal to 5% by mass and less than or equal to 40% by mass of a styrene-isobutylene-styrene triblock copolymer and more than or equal to 60% by mass and less than or equal to 95% by mass of a rubber component of at least one kind selected from the group consisting of natural rubber, isoprene rubber, and butyl rubber, and more than or equal to 0.1 part by mass and less than or equal to 5 parts by mass of sulfur with respect to 100 parts by mass of said polymer component; and a second layer composed of a thermoplastic elastomer composition containing a thermoplastic elastomer, and more than or equal to 0.1 part by mass and less than or equal to 5 parts by mass of sulfur with respect to 100 parts by mass of said thermoplastic elastomer; wherein said styrene-isobutylene-styrene triblock copolymer has a weight-average molecular weight more than or equal to 50,000 and less than or equal to 400,000 and a styrene unit content more than or equal to 10% by mass and less than or equal to 30% by mass; and wherein said second layer further contains a rubber component of at least one kind selected from the group consisting of natural rubber, isoprene rubber, and butyl rubber, in addition to said thermoplastic elastomer composition, said rubber component being more than or equal to 20% by mass and less than or equal to 90% by mass with respect to a total of said thermoplastic elastomer composition and said rubber component.