Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1984-10-29
1986-05-27
Briggs, Sr., Wilbert J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
524500, 524588, 525478, 528 12, 528 21, 528 34, C08L 8306
Patent
active
045916225
ABSTRACT:
This invention relates to silicone pressure-sensitive adhesives having improved viscosity stability and film physical property stability upon aging by a method comprising the condensation of a benzene-soluble resin copolymer of 0.6 to 0.9 triorganoxiloxy units per SiO.sub.4/2 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 endblocking agent containing endblocking triorganosilyl units such as hexamethyldisilazane or trimethylmethoxysilane 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, when desirable, in the presence of a catalytic amount of a mild silanol condensation catalyst if one is not provided by endblocking agent and when, necessary, in the presence of an effective amount of an organic solvent such as xylene. Condensation is preferably conducted with heating under solvent reflux conditions.
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Blizzard John D.
Swihart Terence J.
Briggs Sr. Wilbert J.
Dow Corning Corporation
Rakoczy Richard E.
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