Method of cleaning equipment for handling reactive multicomponen

Details Method of cleaning equipment for handling reactive multicomponen Method of cleaning equipment for handling reactive multicomponen

1985-12-05

1987-06-23

Willis, Prince E.

Compositions

Compositions containing a single chemical reactant or plural...

Organic reactant

252162, 252171, 252172, 134 38, 134 40, C11D 730, C11D 732, C11D 750

Patent

active

046751262

ABSTRACT:
A solvent-containing composition for the cleaning of equipment used to mix and handle reactive multicomponent mixtures of high viscosity, which react to form polymers. In order to improve the capacity of the solvent to dissolve the more or less polymerized mixtures, the solvent contains a chain-terminating agent. For binary systems containing liquid polysulfide polymers, the solvent contains a chain-terminating agent or chain-degrading agent containing mercapto group-containing compounds of the general formula R--SH or disulfide or polysulfide group-containing compounds of the general formula R--S.sub.n --R, in which formulas n.gtoreq.2 and R represents equal or difficult alkyl residues, aryl residues or substituted alkyl or aryl residues. For binary polyurethane systems, the solvent contains chain-terminating compounds which in their molecule contain a Zerewitinoff-active hydrogen atom and have the general formula HY--R.sup.1, wherein ##STR1## where R.sup.2 =H or alkyl and R.sup.1 is an organic radical which will not enter into polyaddition or polycondensation reactions with itself or with isocyanate groups.

REFERENCES:
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patent: 3573212 (1971-03-01), Ambros
patent: 3641169 (1972-02-01), Crabb et al.
patent: 3762952 (1973-10-01), Gouin et al.
patent: 4056403 (1977-11-01), Cramer et al.
patent: 4192692 (1980-03-01), Herrmann
patent: 4438192 (1984-03-01), Archer et al.
patent: 4572792 (1986-02-01), Muller

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