Main > TEXTILES > Fibers > Elastomer Fiber. > Spandex/Elastane PolyUrethane Fiber > Co.: USA. I (Producer/Patents) > Patent > Claims Etc > Claim 1 PolyUrethane Durable Fiber > Mfg. Process by Dry Spinning a PU > Soln. in Organic Solvent, > Additive Ratio=1.7-3, Hard Ratio=

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0.65-3, MW=30,000-200,000 &

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