Microcellular foams having a low glass transition temperature

Abstract

Abstract A MICROCELLULAR POLYURETHANE FOAM HAVING AN INTEGRAL SKIN PREPARED BY REACTING: (1) A PREPOLYMER SYSTEM HAVING AN -NCO CONTENT OF FROM 6 TO 12 PERCENT MADE BY REACTING: (A) TOLUENE DIISOCYANATE WITH (B) AN ORGANIC DIOL SELECTED FROM THE GROUP CONSISTING OF (I) A DIOL HAVING A MOLECULAR WEIGHT OF ABOUT 1000, (II) A DIOL HAVING A MOLECULAR WEIGHT OF ABOUT 2000 AND (III) A MIXTURE OF A DIOL HAVING A MOLECULAR WEIGHT OF ABOUT 1000 AND A DIOL HAVING A MOLECULAR WEIGHT OF ABOUT 2000; AND (2) A CATALYST SYSTEM COMPRISING: (C) AN ORGANIC DIOL SELECTED FROM THE GROUP CONSISTING OF (I) A DIOL HAVING A MOLECULAR WEIGHT OF ABOUT 2000, (II) A MIXTURE OF A DIOL HAVING A MOLECULAR WEIGHT OF ABOUT 1000 AND A DIOL HAVING A MOLECULAR WEIGHT OF ABOUT 2000, WHEREIN THE 1000 MOLECULAR WEIGHT DIOL IS PRESENT IN AN AMOUNT UP TO ABOUT 30 PERCENT BY WEIGHT OF THE MIXTURE OF 1000 AND 2000 MOLECULAR WEIGHT DIOLS, (III) A MIXTURE OF A DIOL HAVING A MOLECULAR WEIGHT OF ABOUT 2000 AND 1,4-BUTANE DIOL AND (IV) A MIXTURE OF A DIOL HAVING A MOLECULAR WEIGHT OF ABOUT 1000, A DIOL HAVING A MOLECULAR WEIGHT OF ABOUT 2000 AND 1,4-BUTANE DIOL; (D) A BLOWING AGENT; (E) AN ORGANO-METALLIC CATALYST; (F) AN AROMATIC AMINE HAVING THE FORMULA ANILINYL-CH2-(ANILINYLENE-CH2)N-ANILINE WHEREIN N EQUALS FROM ABOUT 0.1 TO ABOUT 0.3; AND (G) A HYDROXY COMPOUND SELECTED FROM THE GROUP CONSISTING OF (III) N,N-DI(2-HYDROXYPROPYL) ANILINE AND (IV) AN AROMATIC DIOL HAVING THE FORMULA (3-R1,(H-(O-CH(-CH3)-CH2)3-O-)PHENYL)2-R AND (V) MIXTURES OF (III) AND (IV); THE PROPORTIONS OF (A) TO (B) TO (C) TO (F) TO (G) BEING SUCH THAT: (A) THE ISOCYANATE INDEX IS FROM ABOUT 100 TO ABOUT 120; (B) THE -NH2 FROM AROMATIC AMINE TO -OH RATIO IS IN THE RANGE OF FROM 0.5:1.0 TO 1.0:1.0. (C) THE WEIGHT RATIO OF (G) TO THE SUM OF (F) AND (G) IS IN THE RANGE OF FROM 0.75:1.0 TO 0.95:1.0 WHEN (G) IS N,N/DI(2-HYDROXYPROPYL)-ANILINE AND WHEN AN AROMATIC DIOL IS EMPLOYED AS A SUBSTITUTE IN TOTAL OR IN PART FOR N,N-DI-(2-HYDROXYLPROPYL)-ANILINE, SAID AROMATIC DIOL IS EMPLOYED IN AN AMOUNT CHEMICALLY EQUIVALENT TO THE AMOUNT OF N,N-DI-(2-HYDROXYPROPYL)-ANILINE BEING REPLACED.

Inventors

• 👤 Obaidur Rahman Khan

Bibliographic Details