Soft non-blocking polyurethanes

Details Soft non-blocking polyurethanes Soft non-blocking polyurethanes

1985-11-08

1987-03-03

Welsh, Maurice J.

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

Synthetic resins

From silicon reactant having at least one...

528906, C08G 1838

Patent

active

046476431

ABSTRACT:
Soft, non-blocking, thermoplastic polyurethanes are prepared by reacting a long chain polyester or polyether diol, a short chain diol, a diisocyanate and a silicone diol of the formula: ##STR1## wherein x has a value of about 1 to 30, y has a value of about 1 to 200, R is an alkylene group having 2 to 4 carbon atoms, R.sup.1 is selected from the group consisting of an alkyl group having 1 to 18 carbon atoms, a haloalkyl group having 1 to 18 carbon atoms, a phenyl group, a substituted phenyl group, or a phenylalkyl group, and V and W are divalent linking groups. A unique feature of the invention is that the polymers exhibit, less blocking, are less susceptible to hydrolysis and are highly transparent. These polyurethanes are particularly useful in fabricating medical tubing.

REFERENCES:
patent: 4033912 (1977-07-01), Kleimann et al.
patent: 4057595 (1977-11-01), Raunor et al.
patent: 4076763 (1978-02-01), Thom et al.

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