Urethane catalysis
AssigneeAir Products and Chemicals, Inc.
InventorCharles G. Coe
Life of this patent
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Abstract
Hydrolytically stable premix compositions for preparation of urethane foams are prepared by employing as the organotin catalyst in such premix composition a di- or tri-alkyltin sulfonate corresponding to the formula R.sub.4-n -Sn(O.sub.3 SR').sub.n wherein R is an alkyl radical of 1 to 8 carbon atoms; R' is an alkyl, phenyl, or alkyl phenyl radical of 1 to 8 carbon atoms and n is 1 or 2. Examples include: dibutyltin bis-methanesulfonate, dibutyltin bis-benzenesulfonate, dimethyltin bis-benzenesulfonate, dimethyltin bis-benzenesulfonate, dioctyltin bis-methanesulfonate and dibutyltin bis-toluenesulfonate.
Claims12
Stable pre-mix compositions reactable with organic isocyanates for preparation of polyurethane foams, said compositions comprising an active hydrogen-containing compound as determined by the Zerewitinoff reaction, water and an organotin catalyst, said catalyst being hydrolytically stable and corresponding to the general formula
- R.sub.4-n --Sn(O.sub.3 SR').sub.n
- wherein R is an alkyl radical of 1 to 8 carbon atoms, R' is an alkyl, phenyl or alkyl phenyl radical of 1 to 8 carbon atoms and n is 1 or 2.
In the method of producing polyurethane foam by reacting a polyisocyanate with a premix composition comprising water, hydroxy terminated polyol and catalytic amounts of organotin catalyst, and amine catalyst the improvement which comprises the use in said premix composition of a hydrolytically stable organotin catalyst corresponding to the general formula
- R.sub.4-n --Sn(O.sub.3 SR').sub.n
- wherein R is an alkyl radical of 1 to 8 carbon atoms, R' is an alkyl, phenyl or alkyl phenyl radical of 1 to 8 carbon atoms and n is 1 or 2.
Dependencies are inferred from the claim text.