Process for preparing poly(urea-urethane)

Details Process for preparing poly(urea-urethane) Process for preparing poly(urea-urethane)

2005-01-11

2005-01-11

Sergent, Rabon (Department: 1711)

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

Synthetic resins

From silicon reactant having at least one...

Reexamination Certificate

active

06841646

ABSTRACT:
A poly(urea-ureathane) based on polydimethyl siloxane is prepared by reacting an amino-terminated polydimethyl siloxane with polyisocyanate to form a prepolymer of poly(urea-urethane), and reacting the prepolymer and a chain extender in the presence of a catalyst. The resulting poly(urea-urethane) contains about 5-65 wt % of hard segments, and has a surface resistance of about 10-150 MΩ at high relative humidity, so that it can be used in anti-static electricity and electrostatic discharge shielding.

REFERENCES:
patent: 3957724 (1976-05-01), Schurb et al.
patent: 4076763 (1978-02-01), Thom et al.
patent: 4478893 (1984-10-01), Schonfelder et al.
patent: 4498929 (1985-02-01), Robertson
patent: 4504313 (1985-03-01), Robertson
patent: 4543398 (1985-09-01), Bany et al.
patent: 4546154 (1985-10-01), Robertson
patent: 4600751 (1986-07-01), Lee et al.
patent: 4678688 (1987-07-01), Itoh et al.
patent: 4764330 (1988-08-01), Stuber et al.
patent: 4935482 (1990-06-01), Decker et al.
patent: 5214119 (1993-05-01), Leir et al.
patent: 5221724 (1993-06-01), Li et al.
patent: 5290615 (1994-03-01), Tushaus et al.
patent: 5461134 (1995-10-01), Leir et al.
patent: 5714524 (1998-02-01), Hara et al.
patent: 6310116 (2001-10-01), Yasuda et al.
patent: 6355759 (2002-03-01), Sherman et al.
patent: 6407195 (2002-06-01), Sherman et al.
patent: 6441118 (2002-08-01), Sherman et al.
patent: 6461738 (2002-10-01), Ishikawa et al.

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