KR937000570A - Microbubble polyurethane polymers prepared from isocyanate terminated poly (oxytetramethylene) glycol prepolymers - Google Patents

Abstract

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Description

Microbubble polyurethane polymers prepared from isocyanate terminated poly (oxytetramethylene) glycol prepolymers

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Claims (10)

A method for producing a polyurethane polymer by intimately mixing an organic polyisocyanate composition under reaction conditions in the presence of an active hydrogen-containing composition and a blowing agent comprising water, wherein a) the polyisocyanate composition comprises at least 70% by weight of an isocyanate terminated prepolymer. Wherein the isocyanate terminated prepolymer is obtained by reacting a polyisocyanate containing at least 70% of 4,4′-methylene diphenylisocyanate with poly (oxytetramethylene) glycol having an average hydroxyl equivalent weight of 250-1500. Silver is 14 to 28% by weight, b) the active hydrogen-containing composition is polypropylene having I) an average hydroxyl equivalent weight of 500 to 5000, an average molar functionality of 1.6 to 3.0, and a primary hydroxyl content of at least 50% of the total hydroxyl content. Ether polyols or their Include compounds 70 to 99 parts by weight, and ii) dalyang 150 or less chain-extension chain of 1 to 30 parts by weight of and, c) blowing agent is a comprehensive density (overall density) 100 to 1000kg / m an amount sufficient to provide the ^two resulting polymer Wherein the polyisocyanate composition (a) is present in an amount that provides from 0.85 to 1.3 isocyanate groups per active hydrogen atom of the composition (b) and water present. The process of claim 1 wherein the polyisocyanate composition is present in composition (b) and in an amount that provides 0.94 to 1.05 isocyanate groups per active hydrogen atom of water. The method of claim 2 wherein the isocyanate content of the isocyanate terminated prepolymer is 14-23 weight percent. The process according to claim 1, wherein the isocyanate terminated prepolymer is obtained from poly (oxytetramethylene) glycol with an average hydroxyl equivalent weight of 500 to 1200. 5. 5. The polyether polyol component of the active hydrogen containing composition is present in an amount of 75 to 95 parts by weight with an average hydroxyl equivalent weight of 1000 to 3000 and a primary hydroxyl content of 75%. Wherein the chain extender is present in an amount of from 5 to 15 parts by weight. The method of claim 1 wherein the blowing agent is present in an amount to provide the resulting polymer having a comprehensive density of 400 to 900 kg / M ³ . The polyisocyanate composition of claim 6, wherein a) the polyisocyanate composition comprises at least 90% by weight of isocyanate terminated prepolymer, wherein the isocyanate terminated prepolymer averages polyisocyanates containing at least 85% by weight of 4,4'-methylene diphenylisocyanate. Obtained by reaction with a hydroxyl equivalent of 750-12000 poly (oxytetramethylene) glycol, the isocyanate content of which is 14 to 23% by weight, b) the active hydrogen content of the composition i) the average hydroxyl equivalent weight of 1000 to 3000, average The molar functionality is from 1.9 to 3.0 and the primary hydroxyl content comprises from 75 to 90 parts by weight of a polyether polyol or mixture thereof having at least 65% of the total hydroxyl content and ii) from 5 to 15 parts by weight of a chain extender (a) represents 0.96 to 1.04 isocyanate groups per active hydrogen atom of the composition (b) and water How present in an amount provided. 8. The method of claim 7, wherein the blowing agent consists essentially of water. Microbubble polyurethane polymer prepared according to the method of any one of claims 1 to 8. Poly (oxytetramethylene) glycol having an average hydroxyl equivalent weight of about 250 to about 1500 is a) at least 70% by weight of 4,4'-methylene diphenylisocyanate, and b) 2,4'-methylene diphenylisocyanate, 2, Valuable polys containing up to 30% by weight of 4- and 2,6-toluene diisocyanates, cyclohexane diisocyanates, 1,6-hexamethylene diisocyanates, carbodiimide modified adducts thereof or polymethylenepolyphenyl-polyisocyanates Isocyanate terminated poly (oxytetramethylene) polyol prepolymer obtained by intimate contact with molar isocyanate excess under reaction conditions and having an isocyanate content of 14 to 28% by weight. ※ Note: The disclosure is based on the initial application.