Thermoplastic polyurethanes and molded articles comprising them

Details Thermoplastic polyurethanes and molded articles comprising them Thermoplastic polyurethanes and molded articles comprising them

1996-05-23

1998-07-14

Lee, Helen

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528274, 528300, C08C 7504

Patent

active

057805733

ABSTRACT:
Disclosed are thermoplastic polyurethanes obtainable by reacting (a) a polyester-polyol that satisfies all the following requirements (1) to (4):
(1) its ester group content (number of ester bonds
umber of all carbon atoms) is from 0.08 to 0.17;
(2) it has hydroxyl groups of from 2.01 to 2.08 per one molecule;
(3) it has a number average molecular height of from 1000 to 7000; and
(4) it has a crystallization enthalpy (.DELTA.H) of 70 J/g or less,
(b) an organic diisocyanate and (c) a chain extender at a ratio that satisfies the following numerical formula (i):

REFERENCES:
Journal of Applied Polymer Science, vol. 51, No. 6, Feb. 7, 1994, pp. 1077-1085, Chang, et al., "Role of Functionality In MDI-Based Elastomer Preparation".

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