Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1987-12-28
1989-03-14
Pertilla, Theodore E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525403, 525462, 525469, C08L 7102
Patent
active
048125300
ABSTRACT:
New polymeric compositions comprising polyether-polycarbonate-polyether triblock copolymers and a method of preparation comprising reacting a monohydroxy polyether in an organic with a carbonate precursor such as phosgene, adding the resultant mixture to a dihydric compound such as bisphenol A, water, an organic solvent and an acid acceptor, controlling the pH of the polymerizing mixture at about 11 and, after the polymerization is complete, decreasing the pH to about 8 and recovering the product.
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Letton Alan
Priddy Duane B.
Pertilla Theodore E.
The Dow Chemical Company
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