Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1978-01-31
1979-07-10
Shaver, Paul F.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 15, 528 19, 528 17, 528 18, C08F 1104
Patent
active
041608585
ABSTRACT:
There is provided by the present invention a process for producing a solventless silicone resin having a viscosity at 100% varying from 200 to 5,000 centipoise at 25.degree. C., comprising adding a mixture of water and alcohol to the desired organochlorosilanes taking the silicone alkoxylate and washing it repeatedly with alcohol until the acid content is at least below 1000 parts per million, adding an alkali metal hydroxide to reduce the acidity of the silicone alkoxylate such that it does not exceed 100 parts per million, and then adding sufficient water such that the amount of water that is added is between 0.2 to 0.8 moles of water per mole of hydrocarbonoxy radicals in such silicone hydrolyxate. The excess alcohol and water is stripped off to give the solventless silicone resin of the instant invention having an organo to Si ratio varying from 1.1 to 1.9, having a silanol content varying from 1 to 4% by weight and a hydrocarbonoxy content that varies from 7 to 14% by weight.
A less preferred solventless system can be obtained by simply mixing in an organic solvent, a high alkoxy containing silicone resin produced by traditional procedures, and a high silanol silicone resin also produced by traditional procedure and stripping off the solvent.
REFERENCES:
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patent: 3098833 (1963-07-01), Solomon
patent: 3428706 (1969-02-01), Jasinski et al.
patent: 3642693 (1972-02-01), Jasinski
patent: 3668180 (1972-06-01), Brennan et al.
patent: 3719634 (1973-03-01), Clark et al.
patent: 3847848 (1974-11-01), Beers
General Electric Company
Koltos E. Philip
Schlamp Philip L.
Shaver Paul F.
Young John L.
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