Polyester fibers
AssigneeShowa Highpolymer Co., Ltd.
InventorsTetuya Takahashi, Hitoshi Uda, Akira Nakamura, Ryosuke Kamei, Eiichiro Takiyama
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Abstract
Polyester fiber consisting of an aliphatic polyester having a melt viscosity of 1.0.times.10.sup.2 -1.0.times.10.sup.4 poises at a temperature of 190.degree. C. at a shear rate of 1000 sec.sup.-1 and a melting point of 70-190.degree. C. The polyester fiber of the present invention exhibits biodegradability when buried in the ground. The amount of combustion heat generated on incineration is smaller than that of polyethylene and polypropylene. The polyester fiber of the present invention has excellent physical properties.
Claims11
Polyester fiber comprising an aliphatic polyester having a melt viscosity of 1.0.times.10.sup.2 -1.0.times.10.sup.4 poises at a temperature of 190.degree. C. and a shear rate of 100 sec.sup.-1, and having a melting point of 70-190.degree. C.
- wherein said aliphatic polyester is obtained from ingredients consisting essentially of diisocyanate and a prepolymer in a molten state by adding from 0.1 to 5 parts by weight of diisocyanate to 100 parts by weight of the prepolymer in a molten state,
- wherein said prepolymer
- is obtained from a reaction of at least an aliphatic glycol and an aliphatic dicarboxylic acid, wherein the reaction includes (a) succinic acid, or its anhydride, reacted with 1,4-butanediol, (b) succinic acid, adipic acid, or their anhydride, reacted with 1,4-butanediol, or (c) succinic acid, or its anhydride, reacted with ethylene glycol, and
- has a number-average molecular weight of at least 10,000.
Dependencies are inferred from the claim text.