Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2008-07-22
2008-07-22
Teskin, Fred M (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S135000, C526S146000, C526S147000, C526S209000, C526S216000, C526S217000, C526S221000, C526S222000, C526S237000, C526S284000, C526S347000
Reexamination Certificate
active
10586969
ABSTRACT:
The present invention relates to a soluble polyfunctional vinylaromatic copolymer improved in heat resistance, resistance to thermal decomposition, solvent solubility, and processability. The soluble polyfunctional vinylaromatic polymer is obtained by cationically polymerizing, at a temperature of 20 to 120° C., one or more monomer ingredients including 20 to 100 mol % divinylaromatic compound (a) in the presence of a donor ingredient, e.g., a quaternary ammonium salt, with the aid of a Lewis acid catalyst and an initiator represented by the following general formula (1)wherein R1represents hydrogen or a monovalent C1-6hydrocarbon group; R2represents an aromatic or aliphatic hydrocarbon group having a valence of p; Z represents halogen or C1-6alkoxy or acyloxy; and p is an integer of 1 to 6; provided that when two or more R1's and Z's are present per molecule, they may be identical to different from each other.
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Nippon Steel Chemical Co. Ltd.
Teskin Fred M
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