Thermoplastic polyurethane elastomer blend and process for its m

Details Thermoplastic polyurethane elastomer blend and process for its m Thermoplastic polyurethane elastomer blend and process for its m

1993-04-29

1994-12-27

Seidleck, James J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525130, 525131, C08L 3320, C08L 7504

Patent

active

053767233

ABSTRACT:
The subject invention is directed to a thermoplastic polymer blend of polyurethane and nitrile rubber having a Shore A hardness of about 55 to 70. The thermoplastic polyurethane component includes at least about 50 weight percent (wt. %) polyisocyanate; the nitrile rubber component includes about 34 mole percent (mol %) acrylonitrile; and, the ratio between the thermoplastic polyurethane component and the nitrile rubber component is about 30:70 to 40:60 volume percentage (vol %).
The invention also provides a process for making a thermoplastic polyurethane blend having a Shore A hardness of about 55 to 70; prepared by mixing and kneading about about 180.degree. to 215.degree. C., polyurethane component including at least about 50 percent by weight polyisocyanate with a nitrile rubber having a viscosity of M.sub.L 1+4,100.degree. C.=50 and including about 34 mole percent (mol %) acrylonitrile in a ratio of polyurethane: nitrile rubber of about 30:70 to 40:60 percent by volume (% vol).

REFERENCES:
patent: 3678129 (1972-07-01), Fischer
patent: 4143092 (1979-03-01), Karmell
patent: 4374192 (1983-02-01), Mayer et al.
patent: 4623579 (1986-11-01), Quon

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