Fire retardant and/or antistatic, non-mercury catalyzed polyurethane elastomer

摘要

A fire retardant and antistatic polyurethane elastomer free of mercury and having a Shore A hardness of at least 30 is prepared from a polyol component and a prepolymer (e.g., an isocyanate) component. The polyol component comprises (A) a saturated polyester polyol of ethylene/butane/adipate of a nominal molecular weight and with a functionality of 2 or more, (B) a polyester polyol of ethylene/trimethylol propane/neopentyl adipate of nominal molecular weight and with a functionality of 2.5 or more, (C) an optional glycol chain extender, (D) an optional polymethyl alkyl siloxane defoamer, (E) an optional desiccant paste, (F) an optional polybutadiene oligomer, (G) an antistatic agent, (H) an optional surface modified fumed silica, (I) tris(2-chloro-1-methylethyl)phosphate flame retardant, (J) ammonium polyphosphate flame retardant, and (K) an organometallic catalyst other than a mercury-based organometallic catalyst, e.g., a tin-based catalyst.

主权项

1. A polyol composition comprising in weight percent based upon the weight of the composition:
A. 10 to 60% of a saturated polyester polyol of ethylene/butane/adipate of a nominal molecular weight and with a functionality of 2 or more; B. 40 to 90% of a polyester polyol of ethylene/trimethylol propane/neopentyl adipate of nominal molecular weight and with a functionality of 2.5 or more; C. 0 to 20% 1,4-butane diol chain extender glycol; D. 0 to 0.4% polymethyl alkyl siloxane defoamer dissolved in an isoparaffin; E. 0 to 5% desiccant paste comprising 50 weight percent (wt %) of a zeolite powder suspension in castor oil; F. 0 to 0.8% polybutadiene oligomer; G. 0 to 10% antistatic agent; H. 0 to 0.5% surface modified fumed silica; I. 5 to 15% tris (2-chloro-1-methylethyl) phosphate flame retardant; J. 5 to 15% ammonium polyphosphate flame retardant; and K. 0.002 to 0.1% organometallic catalyst other than mercury- or lead-based organometallic catalyst.