US 5,478,903 A · Maleimide-based copolymer, process for producing it, and thermoplastic resin composition containing the same

Abstract

A maleimide-based copolymer is provided, in which the content of compound (X) shown by the formula (I) is controlled in a range which does not adversely affect the physical properties of the copolymer. Such a copolymer includes an aromatic vinyl-based monomer unit and a maleimide-based monomer unit as essential components, proportion y of the maleimide-based monomer unit in structure is 35 to 65% by weight, and a content of the compound (X) is 3% or less and also, does not exceed a numeral value of 0.06y. The copolymer is prepared by radical copolymerization which is carried out by supplying gradually an aromatic vinyl-based monomer and a maleimide-based monomer into a reaction vessel under a condition of keeping these monomers separated without mixing together beforehand. ##STR1##

Claims15

Dependent claims

A process for producing a maleimide-based copolymer having an aromatic vinyl-based monomer unit and a maleimide-based monomer unit, comprising the steps of:

charging into a reaction vessel an organic solvent and a portion of an amount of an aromatic vinyl-based monomer;
gradually supplying the rest of said amount of said aromatic vinyl-based monomer and a maleimide-based monomer separately to said reaction vessel without mixing said aromatic vinyl-based monomer and said maleimide-based monomer beforehand;
and
polymerizing said aromatic vinyl-based monomer and said maleimide-based monomer.

1 more element

A process for producing a maleimide-based copolymer having an aromatic vinyl-based monomer unit and a maleimide-based monomer unit, comprising the steps of:

charging into a reaction vessel an organic solvent and a portion of an amount of a maleimide-based monomer;
gradually supplying the rest of said amount of said maleimide-based monomer and an aromatic vinyl-based monomer separately to said reaction vessel without mixing said aromatic vinyl-based monomer and said maleimide-based monomer beforehand;
and
polymerizing said aromatic vinyl-based monomer and said maleimide-based monomer.

1 more element

A process for producing a maleimide-based copolymer having an aromatic vinyl-based monomer unit and a maleimide-based monomer unit, comprising the steps of:

charging an organic solvent into a reaction vessel;
gradually supplying an aromatic vinyl-based monomer and a maleimide-based monomer Separately to said reaction vessel without mixing said aromatic vinyl-based monomer and said maleimide-based monomer beforehand;
and
polymerizing said aromatic vinyl-based monomer and said maleimide-based monomer.

1 more element

Dependencies are inferred from the claim text.

Maleimide-based copolymer, process for producing it, and thermoplastic resin composition containing the same

Life of this patent

Maleimide-based copolymer, process for producing it, and thermoplastic resin composition containing the same

Life of this patent

Abstract

Claims15