Insulated glass and sealant therefor

A plasticized cured composition having a moisture vapor transmission rating of no greater than about 1 g/day, an elongation of at least about 100% and low volatility and comprising:

• A. about 30 to about 40 wt. % of a polyurethane which is the reaction product of a hydroxyterminated polybutadiene and tolylene diisocyanate or methylene bis-(4-phenyl isocyanate);
• B. about 20 to about 35 wt. % of plasticizing material, said material comprising about 3 to about 20 wt. % of coal tar having a distillation point of no lower than about 500.degree. F. or roofing asphalt having substantially no volatiles at temperatures up to about 500.degree. F., and said coal tar and said asphalt having substantially no weight loss for 24 hours at 200.degree. F. or polybutene having a weight loss of about 1% or less when subjected to ASTM D-972 for 10 hours at 210.degree. F. or a mixture thereof, and about 80 to about 97 wt. % of phthalates having a boiling point of 450.degree. F. or higher at 10 mm Hg or aromatic resins or aromatic oil or a mixture thereof;
• C. about 20 to about 35 wt. % of filler;
• D. about 2 to about 6 wt. % of thixotropic agent;
• and
• E. about 0.5 to about 2.5 wt. % of a glass adhesion promoter.

A plasticized cured composition including a cured polyurethane or a cured polyether and wherein said composition has a moisture vapor transmission rating of no greater than about 1 g/day, an elongation of 100% and low volatility and wherein said cured polyurethane or said cured polyether is the reaction product of a water-sensitive polyether including a polyethylene or polypropylene glycol and wherein said composition comprises:

• A. about 30 to about 40 wt. % of said cured polyurethane or said cured polyether;
• B. about 35 to about 55 wt. % of plasticizing material, said material comprising about 25 to about 75 wt. % of coal tar having a distillation point of no lower than about 500.degree. F. or roofing asphalt having substantially no volatiles at a temperature of up about 500.degree. F., and said coal tar and said asphalt having substantially no weight loss for 24 hours at 200.degree. F. or a mixture thereof and about 25 to about 75 wt. % of chlorinated paraffins having a chlorine content of at least about 40-70 wt. % or phthalates having a boiling point of 450.degree. F. or higher at 10 mm Hg or a mixture thereof;
• C. about 5 to about 30 wt. % of filler;
• D. about 2 to about 6 wt. % thixotropic agent;
• and
• E. about 0.5 to about 2.5 wt. % of a glass adhesion promoter.

A plasticized cured composition having a moisture vapor transmission rating of no greater than about 1 g/day, an elongation of at least about 100% and low volatility and comprising:

• (A) about 30 to about 45 wt. % of polyurethane prepared by reacting a prepolymer of hydroxyl-terminated polybutadiene and tolylene diisocyanate with butanediol;
• and
• (B) about 25 to about 35 wt. % of a plasticizing material comprising:
• i. phthalate having a boiling point of 450.degree. F. or higher at 10 mm Hg;
• or
• ii. a mixture of about 5 to about 95 wt. % of said phthalate and 5 to about 95 wt. % of asphalt having substantially no volatiles at temperatures up to about 500.degree. F. and substantially no weight loss for 24 hours at 200.degree. F.;
• or
• iii. a mixture of about 5 to about 95 wt. % of said phthalate and about 5 to about 95 wt. % of polybutene having a weight loss of about 1% or less when subjected to ASTM D-972 for 10 hours at 210.degree. F.;
• C. about 25 to about 35 wt. % of talc or calcium carbonate filler;
• and
• D. about 0.5 to about 2.5 wt. % of glass adhesion promoter;
• and
• E. about 3 to about 5 wt. % of thixotropic agent.