Process for producing anhydride-containing polymers for radiation sensitive compositions
AssigneeArch Specialty Chemicals, Inc.
InventorsStephanie Dilocker, Sanjay Malik, Binod De, Ashok Reddy
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Abstract
A synthetic process comprising the following steps: providing a reaction mixture comprising: an ethylenically unsaturated anhydride monomer, at least one ethylenically unsaturated non-anhydride monomer, a free radical initiator, and an alkyl substituted THF solvent having the general structure of formula 1: where R1, R2, R3, and R4 are independently chosen from the group hydrogen and C1-C4 linear or branched alkyl with the proviso that at least one of R1, R2, R3, and R4 is not H; polymerizing the reaction mixture; and removing, by distillation, unreacted monomers, the alkyl substituted THF solvent, and any low boiling volatile reaction products.
Claims27
In a polymerization process for preparing anhydride-containing polymers from a reaction mixture of monomers in a solvent and a free radical initiator, the improvement comprising employing as a solvent a alkyl-substituted tetrahydrofuran solvent of the formula 1:
- where R1, R2, R3, and R4 are independently chosen from the group consisting of hydrogen and C1-C4 linear or branched alkyl with the proviso that at least one of R1, R2, R3, and R4 is not H.
A polymerization process for preparing an anhydride-containing polymer, the process comprising:
- a) providing a reaction mixture comprising:
- an ethylenically unsaturated anhydride monomer, at least one ethylenically unsaturated non-anhydride monomer, a free radical initiator, and an alkyl substituted THF solvent of formula 1:
- where R1, R2, R3, and R4 are independently chosen from the group consisting of hydrogen and C1-C4 linear or branched alkyl with the proviso that at least one of R1, R2, R3, and R4 is not H;
- and optionally a co-solvent;
- b) polymerizing the reaction mixture;
- and
- c) removing unreacted monomers, the alkyl substituted THF solvent, and any low-boiling volatile reaction products having a lower boiling point than the boiling point of any optional co-solvent employed.
Dependencies are inferred from the claim text.