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US 5,668,231 AGranted
Heat-resistant maleimido polymers/block copolymers
AssigneeAtochem
InventorsSunil K. Varshney, Philippe Teyssie, Roger Fayt
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AssigneeAtochem
InventorsSunil K. Varshney, Philippe Teyssie, Roger Fayt
Estimating the term…
Novel N-substituted maleimide homopolymers having a number-average molecular weight ranging from 12,000 to about 100,000 are prepared by anionically polymerizing an N-substituted maleimide monomer, in solvent phase, in the presence of at least one organometallic polymerization initiator which comprises sec-butyllithium, a sodium alcoholate, diphenylmethylpotassium, naphthalenelithium or naphthalenesodium, and novel N-substituted maleimide homopolymers having a polydispersity index ranging from 1.1 to 1.5 are prepared by anionically polymerizing an N-substituted maleimide monomer, in solvent phase, in the presence of at least one alkali metal organometallic polymerization initiator and at least one inorganic or organic salt of an alkali or alkaline earth metal; novel block copolymers include blocks of the above maleimido homopolymers and, e.g., blocks of an acrylic or methacrylic polymer.
A process for the preparation of an N-substituted maleimide homopolymer having a number-average molecular weight ranging from 12,000 to 100,000, said process comprising anionically polymerizing an N-substituted maleimide monomer, in solvent phase, in the presence of at least one organometallic polymerization initiator which comprises sec-butyllithium, a sodium alcoholate, diphenylmethylpotassium, naphthalenelithium or naphthalenesodium.
A process for the preparation of an N-substituted maleimide homopolymer having a polydispersity index ranging from 1.1 to 1.5, said process comprising anionically polymerizing an N-substituted maleimide monomer, in solvent phase, in the presence of at least one alkali metal organometallic polymerization initiator and at least one inorganic or organic salt of an alkali or alkaline earth metal.
A process for the preparation of a bi-block copolymer in which a polymer block based on an N-substituted maleimide is bonded to a polymer block based on an acrylic or methacrylic monomer, or of a tri-block copolymer in which a central block based on an N-substituted maleimide is bonded to two endblocks based on an acrylic or methacrylic monomer, comprising:
A process for the preparation of a tri-block copolymer in which a central polymer block based on an acrylic or methacrylic monomer is bonded to two endblocks based on an N-substituted maleimide, comprising:
Dependencies are inferred from the claim text.