System for forming elastomeric compositions for application to metal

A system for forming an elastomeric composition for application to a substrate, the system comprising based on 100 parts by weight of said system:

• 35.5 to 40 parts by weight of an isocyanate component comprising a polymeric polyisocyanate;
• and
• an isocyanate-reactive component comprising a polyol component and 4 to 10 parts by weight of a polyetheramine based on 100 parts by weight of said isocyanate-reactive component, said polyol component comprising a mixture of:
• (a) 25 to 37 parts by weight of a hydrophobic polyol which is castor oil;
• (b) 1.8 to 5 parts by weight of a polyether polyol derived from a catalyzed addition reaction of propylene oxide, said polyether polyol having a weight average molecular weight of from 500 to 650 and an average functionality of from 3.5 to 4.0;
• (c) 4 to 10 parts by weight of a polyaminopolyol;
• and
• (d) 4 to 10 parts by weight of polytetramethylene ether glycol obtained by the polymerization of tetrahydrofuran and having a weight average molecular weight of from 650 to 2000 g/mol.

A system for forming an elastomeric composition for application to a substrate, the system comprising:

• an isocyanate component comprising a polymeric polyisocyanate and an isocyanate-terminated prepolymer wherein said isocyanate-terminated prepolymer is present in said isocyanate component in an amount of from about 25 to about 75 parts by weight based on 100 parts by weight of said isocyanate component;
• and
• an isocyanate-reactive component comprising a polyol component and a polyetheramine, said polyol component comprising a mixture of:
• (a) a hydrophobic polyol;
• (b) a polyether polyol different that said hydrophobic polyol, said polyether polyol having a weight average molecular weight of greater than 500 g/mol;
• and
• (c) a polyaminopolyol.

A system for forming an elastomeric composition for application to a substrate, the system comprising:

• an isocyanate component comprising a polymeric polyisocyanate;
• and
• an isocyanate-reactive component comprising a polyol component and a polyetheramine, said polyol component comprising a mixture of:
• (a) a hydrophobic polyol;
• (b) a polyether polyol different than said hydrophobic polyol, said polyether polyol having a weight average molecular weight of greater than 500 g/mol;
• (c) a polyaminopolyol;
• and
• (d) a polytetramethylene ether glycol obtained by the polymerization of tetrahydrofuran, said polytetramethylene ether glycol comprising from 4 to 10 weight percent of the total weight of said system.