ABS polymer and process for its preparation
AssigneeFoster Grant Co., Inc.
InventorStelvio Papetti
Life of this patent
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Abstract
ABS polymers having improved physical properties are prepared by graft polymerizing, in an aqueous medium, and in the presence of a suspending agent, styrene and acryonitrile onto a butadiene polymer in the form of a latex using certain peroxy ester catalysts.
Claims18
A method for graft polymerizing a mixture containing monovinyl aromatic monomer and a nitrile monomer which is acrylonitrile or methacrylonitrile onto a rubbery polymer in the form of a latex, said rubbery polymer being selected from the group consisting of polybutadiene, butadiene-styrene copolymer, butadiene acrylonitrile copolymer or mixtures thereof, said method consisting essentially of effecting the polymerization in an aqueous medium in the presence of an effective suspending agent, and, as the essential catalytic agent, about 0.05-0.8%, based on the total weight of monomer present, of at least one compound having the formula:
- ##STR3## wherein R is an alkyl radical having 1-8 carbon atoms and R' is a tertiary alkyl group containing up to 8 carbon atoms.
A method of making an ABS type polymer which consists essentially of:
- 1. adding to an aqueous medium contained in a closed reaction vessel, (a) a rubbery polymer which is in latex form and which is polybutadiene, butadiene-styrene copolymer, butadiene-acrylonitrile copolymer and mixtures thereof, (b) styrene, (c) acrylonitrile, (d) a suspending agent, (e) about 0.05 - 0.8%, of at least one catalyst having the formula:
- ##STR4## wherein R is an alkyl group having 1-8 carbon atoms and R' is a tertiary alkyl group having up to 8 carbon atoms;
- 2. polymerizing the contents of said reaction vessel at a temperature of about 50.degree.-150.degree. C, with continuous agitation.
A method for marking ABS type polymers by polymerizing an aqueous reaction medium consisting essentially of a monovinyl aromatic monomer, acrylonitrile, or methacrylonitrile, a rubbery polymer which is employed in latex form and which is polybutadiene, butadiene-styrene copolymer, or butadiene-acrylonitrile compolymer or mixtures thereof, an effective suspending agent, and about 0.05-0.8%, based on the total weight of the monomer present, of a catalyst of the formula:
- ##STR6## wherein R is an alkyl radical of 1-8 carbon atoms and R' is a tertiary alkyl group of up to about 8 carbon atoms.
Dependencies are inferred from the claim text.