| 摘要 |
Aqueous casting solutions for the production of lightpolarizing sheets or films based on polyvinyl alcohol A b s t r a c t Casting solutions for the production of lightpolarizing films or sheets contain, relative to the sum of weights (A) + (B) + (C) + (D) = 100 % by weight, (A) 30-95 % by weight, preferably 40-75 % by weight, of water, (B) 1-40 % by weight, preferably 4-30% by weight, of vinyl, alcohol polymer, (C) 0.01-5 % by weight, preferably 0.02-2% by weight, of the dichroic dyestuff, (D) 0.1-75 % by weight, preferably 0.5-50 % by weight, of one or several organic compounds from the group consisting of aliphatic polyols having 2-6 C atoms, aliphatic ether polyols having 2-6 C atoms, C1-C4-alkyl ethers of aliphatic polyols having 2-6 C atoms, aliphatic aminoalcohols having 2-4 C atoms, amides of aliphatic C1-C4-carboxylic acids, and, if desired, a C1-C4-monoalcohol, and, if desired (E) further additives customary for casting solutions, for example stabilizers, and wherein if using glycerol solely, the weight ratio of glycerol: vinylalcohol polymer is about 0.2 - 1 : 1, preferably 0.3-0.5 : 1. Le A 26 395-US
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