Silylated polymer derived from butadiene and solvent-resistant pressure sensitive adhesive composition containing same
A technology of silylation and polyhydroxy compounds, applied in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve problems such as no solvent resistance
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Embodiment 1
[0070] Into a reaction vessel equipped with mixing capacity, condenser, nitrogen atmosphere and heating was added 250.0 g of hydroxyl terminated polybutadiene Poly bd having a hydroxyl number of 101 R-20LM resin (Special Chem). The resin was dried overnight at 85°C using a nitrogen purge. The resin was cooled to 65° C., then 0.21 g of a 10% by weight solution of dibutyltin dilaurate was added and stirred for 30 minutes. Then 75.2 g of isophorone diisocyanate (IPDI) were added dropwise within 2 minutes with stirring. An exotherm to 88°C was observed, the temperature was lowered to 72-75°C and held for 45 minutes. The wt% of NCO was determined by standard methods and was found to be 2.74 wt%. At this point, 49.7 g of N-ethylaminoisobutyltrimethoxysilane were added and stirring was continued at this temperature for 1 hour, followed by cooling to room temperature. A sample of approximately 15 g of this reaction product was dissolved in 35 g of toluene containing 0.37 g of be...
Embodiment 2
[0072] Into a reaction vessel equipped with mixing capacity, condenser, nitrogen atmosphere and heating was added 120.0 g of hydroxyl terminated polybutadiene Poly bd with a hydroxyl number of 40.4 R-45M (SpecialChem) resin and 120.0 g of polypropylene polyol Acclaim with 28 hydroxyl numbers 4200 (Special Chem) resin. The polyol is dried to reduce the moisture level. To this mixture was added 24.5 g of isophorone diisocyanate followed by heating at approximately 80°C for 2 hours and then cooling to 70°C to 75°C for 3 hours at which point 0.2g of 10% by weight dilauric acid was added dibutyltin solution and maintain this temperature for 1 hour. The wt% NCO was determined to be 0.8 wt%. At this point, 24.5 g of N-ethylaminoisobutyltrimethoxysilane was added and stirring was continued while cooling to room temperature. The samples were coated and cured as in Example 1 except that curing was performed at 177°C for 2 minutes. Tests were performed as in Example 1. The time...
Embodiment 3
[0074] Into a reaction vessel equipped with mixing capacity, condenser, nitrogen atmosphere and heating was added 200.0 g of hydroxyl terminated polybutadiene Krasol with a hydroxyl number of 46 LBHP2000 (Sartomer) resin and 200.0 g toluene, then reflux to reduce moisture level. After cooling to 85° C., 35.9 g of isophorone diisocyanate were added to the mixture. The temperature was maintained at 85°C to 95°C for 3 hours at which point 0.1 g of a 10% by weight solution of dibutyltin dilaurate was added and the temperature continued for 1 hour. The wt% NCO was determined to be 2.4 wt%. At this point, 32.4 g of N-ethylaminoisobutyltrimethoxysilane was added and stirring was continued while cooling to room temperature. The samples were coated and cured as in Example 1 except that curing was performed at 150°C for 3 minutes. Tests were performed as in Example 1. The weight percent of benzoyl peroxide was 1.5 weight percent on a solids basis. Delrin on smooth surfaces The...
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