C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/4102, 400/53
C08G 77/44 (2006.01) C09J 183/10 (2006.01)
Patent
CA 1253275
SILICONE PRESSURE-SENSITIVE ADHESIVE PROCESS AND PRODUCT WITH IMPROVED LAP-SHEAR - I ABSTRACT This invention relates to silicone pressure- sensitive adhesives having improved viscosity stability, film physical property stability upon aging and lap shear stability (hold time) made by a method comprising the condensation of a benzene-soluble resin copolymer of 0.6 to 0.9 triorganoxiloxy units per SiO4/2 unit which contains silicon-bonded hydroxyl radicals and a polydiorganosiloxane preferably containing silicon-bonded hydroxyl or other hydrolyzable endblocking radicals with a sufficient amount of an ammonia releasing endblocking agent containing endblocking triorganosilyl units such as hexamethyldi- silazane to result in a 1:0.8 to 1:3 mole ratio of silicon- bonded hydroxyl radicals and hydrolyzable endblocking radicals to total moles of triorganosilyl units provided by the endblocking agent. The condensation is conducted with heating at 80°C - 160°C in the presence of 0.5 to 10 moles of water per mole of =NH present in the endblocking agent and, when necessary, in the presence of an effective amount of an organic solvent such as xylene. Condensation is preferably conducted under solvent reflux conditions. When the condensation reaction is substantially complete, the remaining endblocking agent, water and ammonia released by the endblocking agent is stripped from the composition.
492579
Blizzard John D.
Narula Dipak
Dow Corning Corporation
Gowling Lafleur Henderson Llp
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