The high-barrier tie-layer resins market is projected to grow from USD 1,863.8 million in 2026 to USD 3,498.6 million by 2036, at a CAGR of 6.5%. Anhydride-Modified Polyolefins (PE/PP) will dominate with a 44.0% market share, while food & beverage flexible packaging will lead the application segment with a 36.0% share.