Polymer having excellent rigidity

Abstract

PURPOSE: To prepare the titled polymer having excellent mechanical characteristics such as rigidity, shear strength, etc. as well as high heat-resistance, by hydrolyzing a ring-opening polymer of a 5-norbornene-2-carboxylic acid ester derivative derived from cyclopentane. CONSTITUTION: The objective polymer having an intrinsic viscosity of 0.3W4, and composed of the constituent unit of formula I (R 1 is H, alkyl or phenyl; R 2 is H or alkyl) and the constituent unit of formula II (R 3 is alkyl), wherein the amount of the unit of formula I is 90W100wt% based on the whole units and the trans-content of the double bond in the unit of formula I and unit of formula IIis ≥40%, can be prepared preferably by (1) dissolving a ring-opening polymer of a 5-norbornene-2-carboxylic acid ester derivative in a polar organic solvent, (2) hydrolyzing in two steps e.g. with sodium hydroxide, and (3) neutralizing the product with an acid. COPYRIGHT: (C)1984,JPO&Japio

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    JP-S6232718-AFebruary 12, 1987Nippon Telegr & Teleph Corp Binarization method for analog signal