Abstract: The present invention is directed to a process for the production of optionally cellular, polyurethane elastomer moldings or optionally cellular, rigid structural polyurethanes by reacting a reaction mixture containing(i) a polyisocyanate,(ii) a high molecular weight polymer having at least two hydroxy groups and having a molecular weight of 400 to about 10,000,(iii) about 5 to 50% by weight, based on the weight of component (ii) of a chain-extender having at least two hydroxy groups and(iv) about 0.05 to 10 weight percent, based on the weight of components (ii) and (iii) of a salt based on a carboxy functional siloxane and an amidine group-containing compound of the formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.

Abstract: The present invention is directed to a process for the production of optionally cellular, polyurethane elastomer moldings or optionally cellular, rigid structural polyurethanes by reacting a reaction mixture containing(i) a polyisocyanate,(ii) a high molecular weight polymer having at least two hydroxy groups and having a molecular weight of 400 to about 10,000,(iii) about 5 to 50% by weight, based on the weight of component (ii) of a chain-extender having at least two hydroxy groups and(iv) about 0.05 to 10 weight percent, based on the weight of components (ii) and (iii) of a salt based on a carboxy functional siloxane and an amidine group-containing compound of the formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.

Abstract: The present invention is directed to a process for the production of optionally cellular, polyurethane elastomer moldings or optionally cellular, rigid structural polyurethanes by reacting a reaction mixture containing(i) a polyisocyanate,(ii) a high molecular weight polymer having at least two isocyanate-reactive groups and having a molecular weight of 400 to about 10,000,(iii) about 5 to 50% by weight, based on the weight of component (ii) of a chain-extender having at least two isocyanate-reactive groups and(iv) about 0.05 to 10 weight percent, based on the weight of components (ii) and (iii) of a salt based on a carboxy functional siloxane and an amidine group-containing compound of the formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.

Abstract: The present invention is directed to a process for the production of optionally cellular, polyurethane elastomer molding by reacting a reaction mixture containing(I) a polyisocyanate,(II) an isocyanate-reactive polymer having a molecular weight of about 1800 to 12,000,(III) about 5 to 50% by weight, based on the weight of component (II) of a chain extender comprising a sterically hindered aromatic diamine and(IV) an internal mold release agent mixture comprising(a) about 0.

Abstract: The present invention is directed to a process for the preparation of a stable, liquid adduct comprising reacting a mixture of neopentyl glycol and propylene glycol with a diphenylmethane diisocyanate containing less than 85 percent by weight of the 4,4'-isomer at a temperature of from about 25.degree. C. to about 120.degree. C. in an amount such that said adduct has an isocyanate group content of from about 20 to about 30 percent by weight and wherein the ratio of mole equivalents of neopentyl glycol to mole equivalents of propylene glycol is from 0.05:0.95 to 0.95:0.05, with the further proviso that(i) if the 4,4'-isomer content of the diphenylmethane diisocyanate is not less than 80 percent by weight, then said ratio is from 0.45:0.55 to 0.70:0.30,(ii) if the 4,4'-isomer content of the diphenylmethane diisocyanate is less than 80 percent by weight but not less than 70 percent by weight, then said ratio is from 0.35:0.65 to 0.85:0.

Abstract: The present invention is directed to a process for the preparation of a stable, liquid adduct comprising reacting a mixture of 1,3-butane diol and propylene glycol with diphenylmethane diisocyanate at a temperature of from about 25.degree. C. to about 120.degree. C. in an amount such that the resultant product has an isocyanate group content of from about 20 to about 30 percent by weight, and wherein the ratio of mole equivalents of 1,3-butane diol to mole equivalents of propylene glycol is from 0.05:0.95 to 0.95:0.05, with the further proviso that(i) if the 4,4'-isomer content of the diphenylmethane diisocyanate is equal to or greater than 90 percent by weight, then said ratio is from 0.45:0.55 to 0.70:0.30, and(ii) if the 4,4'-isomer content of the diphenylmethane diisocyanate is less than 90 percent by weight, but not less than 70 percent by weight, then said ratio is from 0.30:0.70 to 0.85:0.15.The invention is also directed to a product produced from such process.

Abstract: The present invention is directed to a process for the preparation of a stable, liquid adduct comprising reacting a mixture of 1,3-butane diol and neopentyl glycol with diphenylmethane diisocyanate at a temperature of from about 25.degree. C. to about 120.degree. C. in an amount such that said adduct has an isocyanate group content of from about 20 to about 30 percent by weight, and wherein the ratio of mole equivalents of 1,3-butane diol to mole equivalents of neopentyl glycol is from 0.05:0.95 to 0.95:0.05, with the further proviso that(i) if the 4,4'-isomer content of the diphenylmethane diisocyanate is equal to or greater than 98 percent by weight, then said ratio is from 0.30:0.70 to 0.65:0.35,(ii) if the 4,4'-isomer content of the diphenylmethane diisocyanate is less than 98 percent by weight but not less than 90 percent by weight, then said ratio is from 0.30:0.70 to 0.75:0.

Abstract: The present invention is directed to a process for the production of optionally cellular, polyurethane elastomer molding by reacting a reaction mixture containing(I) a polyisocyanate,(II) an isocyanate-reactive polymer having a molecular weight of about 1800 to 12,000,(III) about 5 to 50% by weight, based on the weight of component (II) of a chain extender comprising a sterically hindered aromatic diamine and(IV) an internal mold release agent mixture comprising(a) about 0.

Abstract: The present invention is directed to a process for the production of polyurethane elastomer moldings by reacting a reaction mixture in a closed mold, wherein said reaction mixture comprises:(a) an organic polyisocyanate;(b) an organic active hydrogen group-containing compound having a molecular weight of from 1800 to 12,000 and containing at least two active hydrogen groups;(c) 1,3,5-triethyl-2,6-diamino benzene and, optionally(d) a catalyst for the reaction between hydroxyl groups and isocyanate groups,wherein component (c) is present in an amount of from 25 to 35 percent by weight based on the combined weight of components (b) and (c), wherein the amounts of components (a), (b) and (c) are such that the isocyanate index of the reaction mixture is from about 90 to 110, and wherein all of said components are processed via a one-shot process whereby (a) is mixed simultaneously either with (b), (c) and (d) or with a non-reacted premixture of some or all of (b), (c) and (d).