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AssigneeSumitomo Chemical Company, Limited
InventorsAkira Yokota, Yasuhiro Hirano, Masatsugu Akiba, Hiroshi Nakamura, Shigeki Naitoh
Estimating the term…
The invention provides a cis-stilbene type epoxy resin having lower melting point and lower viscosity than the trans-stilbene type epoxy resin hitherto known. The stilbene type epoxy resin has a cis-isomer content of essentially 100%, or in the alternative, at least about 10% with the rest being the trans-isomer, and is based on the following general formula (1): ##STR1## wherein R.sub.1 to R.sub.8 are independently an acyclic or cyclic alkyl group, a hydrogen atom, or a halogen atom. Production processes for these epoxy resins are also disclosed.
A composition comprising an epoxy resin containing between about 0.1 to about 20 wt. % stilbene linkages, wherein said stilbene linkages are characterized by a cis-isomer content which is at least about 10%, wherein said cis-isomer content is a value equal to ((mol cis-isomer)/(mol cis-isomer+mol trans-isomer)).times.100%, and said epoxy resin has a melting point less than about 150 degrees Celsius and viscosity of less than about 0.2 poise at 150 degrees Celsius.
A composition comprising an epoxy resin which is uncured and contains the structural unit having epoxy functional groups represented by formula (1):
A composition comprising a stilbene epoxy resin having a cis-isomer content of at least about 10%, calculated as 100%.times.((mol cis-isomer)/(mol cis-isomer+mol trans-isomer)), said cis-isomer of said stilbene epoxy resin being represented by the general formula (1) ##STR7## wherein R.sub.1 to R.sub.8 independently represent an acyclic or cyclic alkyl group, a hydrogen atom or a halogen atom, and said epoxy resin has a melting point less than about 150 degrees Celsius and viscosity of less than about 0.2 poise at 150 degrees Celsius.
Dependencies are inferred from the claim text.