COMPOSITION CAPABLE OF FORMING YELLOWING-FREE, LOW-HARDNESS POLYURETHANE ELASTOMER, AND METHOD FOR PRODUCING YELLOWING-FREE, LOW-HARDNESS POLYURETHANE ELASTOMER USING THE SAME

摘要

The present invention provides a non-yellowing, low hardness without the use of plasticizers Donna non-bleeding properties (bleeding-free property) is achieved, tack (tack) is small, and that the hardness variation as a function of temperature provides a thermosetting polyurethane elastomer in a small problem. If the present invention is to include a plasticizer standing, and also characterized in that said (A) isocyanate-terminated prepolymer and (B) a polyester polyol shown below. (A) isocyanate-terminated prepolymer: hexane diisocyanate with a molecular weight of 500 or less branched alkyl group-containing glycol obtained via a process of reacting an isocyanate-terminated prepolymer. (B) polyol polyester: trimethylolpropane, obtained from 3-methyl-1,5-pentanediol and adipic acid, average functional group number = 2.5 to 3.5, a polyester polyol having a number average molecular weight of from 800 to 5000