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Impact Resistant Polyurethane

IP.com Disclosure Number: IPCOM000076752D
Original Publication Date: 1972-Apr-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Johnson, DE: AUTHOR [+2]

Abstract

An isocyanate is reacted with a substantially equivalent amount of a mixture of polyols. Suitable polyurethanes are polyphenylmethane polyisocyanate, and methylene diphenyl di-isocyanate. The most preferred isocyanate is tolylene di-isocyanate. The mixture of polyols comprises from about 1 to about 3O per cent by weight polybutadienediol having a molecular weight of less than 3,000, and from 99 to 70 per cent by weight polyether-polyol having an equivalent weight of from 80 to 150, preferably of between 100 and 150. The polyether-polyol has a functionality of at least 3. The reaction takes place within an enclosed container filled to at least 60 per cent of its volume by the starting materials prior to reaction.

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Impact Resistant Polyurethane

An isocyanate is reacted with a substantially equivalent amount of a mixture of polyols. Suitable polyurethanes are polyphenylmethane polyisocyanate, and methylene diphenyl di-isocyanate. The most preferred isocyanate is tolylene di- isocyanate. The mixture of polyols comprises from about 1 to about 3O per cent by weight polybutadienediol having a molecular weight of less than 3,000, and from 99 to 70 per cent by weight polyether-polyol having an equivalent weight of from 80 to 150, preferably of between 100 and 150. The polyether-polyol has a functionality of at least 3. The reaction takes place within an enclosed container filled to at least 60 per cent of its volume by the starting materials prior to reaction.

By the method of producing such a polyurethane, a prepolymer was prepared from 50 parts by weight of propoxylated pentaerythritol and 50 parts by weight of propoxylated sorbitol. The mixture also contained 1 pph catalyst, and 1.5 pph of a silicon based surfactant. An equal equivalent amount of an isocyanate, prepared from reacting 100 g propoxylated pentaerythritol with 4.25 equivalents tolylene diiisocyanate was added to the above.

Test specimens were cured at 85 degrees C for at least two hours. The specimens had tensiles of 6,000 to 7,500 psi, impact strengths of 0.3 to 0.4 ft. lb/in. notch, and a heat deflection temperature of 73.9 degrees C.

When the polyol prepolymer was mixed at a weight ratio of 80/20 parts with poly...