Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2005-04-05
2005-04-05
Teskin, Fred (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S328900, C525S340000, C525S353000, C525S355000
Reexamination Certificate
active
06875821
ABSTRACT:
A process for making poly(hydroxystyrene)s whose phenolic hydroxyl groups are partially protected by acid-decomposable or -eliminable groups, by which the degree of deblocking of the phenolic hydroxyl groups is controlled. Namely, the production of a polymer containing, in the molecule, repeating units of the general formula (IA) and those of the general formula (IB), comprising adding an acid to polymer (B) containing in the molecule repeating units of general formula (II) in an organic solvent with the molar ratio of the acid to the OR3group being 0.0001 equivalent or above but below 0.05 equivalent, and reacting the polymer with the acid. In the general formulae, R1is hydrogen or methyl; R2is C1-6alkyl; R3is an acid-decomposable or -eliminable group; R4is hydrogen or a group derived from R3by decomposition with acid; and p is 0, 1, or 2, with the proviso that the IB/IA molar ratio ranges 98/2 to 30/70.
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K.E. Uhrich et al., “Formation of Polymers Containing 4-Hydroxystyrene via Hydrolysis of 4-((Trimethylsilyl)oxy)styrene,” American Chemical Society, vol. 27, No. 18, pp. 4936-4940, (1994).
Kimizuka Shinichi
Muramoto Hiroo
LaPointe Dennis G.
Mason Law P.L.
Nippon Soda Co. Ltd.
Teskin Fred
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