Stabilizer package for polyurethane comprising a substituted cre

Details Stabilizer package for polyurethane comprising a substituted cre Stabilizer package for polyurethane comprising a substituted cre

1985-12-18

1987-06-30

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

252182, 524719, 524720, 524721, 560331, 560332, 560333, C08L 7504

Patent

active

046771549

ABSTRACT:
The invention relates to elimination of discoloration in polyurethanes, particularly thermoplastic polyurethanes, by the addition to the reaction mixture from 0.01 to 1 percent by weight, based on the isocyanate component, a stabilizer package characterized as BHT and a compound selected from tris(nonylphenyl) phosphite, tetrakis(2,4-di-t-butylphenyl)-4,4'-biphenylene diphosphonite, bis(2,4-di-t-butylphenyl)pentaerythritol diphosphite, 2,2'-oxamido-bis[ethyl-3(3,5-dit-butyl-4-hydroxyphenyl)]propionate, disteryl thiodipropionate, triisodecyl phosphite, trilauryl trithiophosphite, distearyl pentaerythritol, 2,2'-ethylene bis(4,6-di-tertiarylbutylphenol), octadecyl 3-(3',5'-di-t-butyl-4'-hydroxy phenyl) propionate, 4,4'-thio-bis(2-t-butyl-5-methylphenol), 4,4'-thio-bis(2-t-butyl-5-methylphenol), 2,2'-methylene-bis-(4-methyl-6-t-butylphenol), tris (3,5-di-t-butyl-4-hydroxybenzyl) isocyanurate, phenothiazine, tris(2,4-di-t-butylphenyl) phosphite, 4,4'-methylene bis(2,6-di-t-butylphenol), 2,6-di-t-butyldimethyl-aminomethylphenol and blends thereof.

REFERENCES:
patent: 2957903 (1960-10-01), Spiegler
patent: 3715381 (1973-02-01), Spaunburgh et al.
patent: 4065362 (1977-12-01), Kataoka et al.
patent: 4297472 (1981-10-01), Heiss
Cooper et al, U.S. Defensive Publication No. T856,006, published Nov. 5, 1968, filed Nov. 15, 1966, 8560G4.

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