Polyurethane molding compound and biodegradable filaments manufa

Details Polyurethane molding compound and biodegradable filaments manufa Polyurethane molding compound and biodegradable filaments manufa

1994-06-09

1996-03-05

Seidleck, James J.

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528906, 428364, C08G 1840, C08G 1842

Patent

active

054969093

ABSTRACT:
A thermoplastic polyurethane molding compound, which is capable of being spun from the melt into filaments, is able to be enzymatically degraded within a few weeks. The compound contains exclusively linear components, and can be prepared from 100 parts by weight of a polyol combination from 70 to 90 parts by weight of polyester-polyol having a molecular weight of 2000, based on adipic acid with ethane diol, butane diol, hexane diol, neopentyl glycol, or diethylene glycol, and from 10 to 30 parts by weight of polyether polyol based on polyethylene glycol having a molecular weight of 800 to 4000. Also contained are 1,6-hexamethylene diisocyanate or, in its place, isophorone diisocyanate, or dicyclohexylmethane 4,4'-diisocyanate in an equivalency ratio to the entire polyol of the polyol combination of 2.8:1.0 to 12.0:1.0; as well as, as chain lengtheners, 1,4-butane diol and/or 1,6-hexane diol with an equivalency ratio to the entire polyol of the polyol combination of 1.75:1.0 to 11.3:1.0. The NCO coefficient, formulated from the quotients of the equivalency ratios of isocyanate groups multiplied by 100 and of the sum of the hydroxyl groups from the polyols and chain lengtheners, is from 97 to 99.

REFERENCES:
patent: 3684770 (1972-08-01), Meisert et al.
patent: 4980445 (1990-12-01), van der Wal
patent: 5258422 (1993-11-01), Chang et al.
Saunders & Frisch; Polyurethanes, 1964, p. 702.

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