Stabilization of flame retardant premix for polyurethane
AssigneeAir Products and Chemicals, Inc.
InventorsHarry V. DePaul, David C. Fondots, Rocco L. Mascioli, John R. Panchak
Life of this patent
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Abstract
The storage stability of otherwise unstable premix compositions for flame retardant rigid polyurethane foams containing in the premix a chlorinated polyether polyol and a tertiary amine catalyst, is enhanced by incorporation into the premix a synergistic combination of an organic sulfur compound and an unsaturated carbon compound. The preferred sulfur compound is thiourea; among the preferred unsaturated carbon compounds are unsaturated terpenes such as allo-ocimene and unsaturated higher fatty acids such as tall oil fatty acids and mono-, di-, and trienic C.sub.18 acids.
Claims20
A premix composition prepared for admixture with an isocyanate to form rigid flame-retardant polyurethane products, said premix composition comprising:
- (a) halogenated polyol;
- (b) tertiary amine catalyst;
- (c) organic blowing agent;
- (d) cell stabilizer;
- (e) organic sulfur compound selected from the group consisting of thiourea or thiocarbamate compounds;
- and
- (f) at least one unsaturated carbon compound selected from the group consisting of unsaturated hydrocarbons, unsaturated higher fatty acids, and unsaturated higher fatty and polyester alcohols.
A premix composition for preparation of rigid polyurethane flame retardant foam products comprising chlorinated polyether polyol, amino polyol, halohydrocarbon blowing agent, cell stabilizer and tertiary amine catalyst, said composition further containing as activity stabilizing agent a synergistic combination of thiourea and an unsaturated carbon compound, said activity stabilizing agent combination together with the tertiary amine catalyst being present in an amount of 5 to 10 parts by weight per hundred parts of chlorinated polyether polyol, said unsaturated carbon compound containing at least 8 carbon atoms in an olefinic hydrocarbon chain and being selected from the group consisting of unsaturated hydrocarbons, unsaturated higher fatty acids, unsaturated higher fatty alcohols and unsaturated polyester alcohols.
Dependencies are inferred from the claim text.