METHOD FOR MANUFACTURING RUBBER-REINFORCED STYRENIC RESIN POWDER AND RUBBER-REINFORCED STYRENIC RESIN POWDER

• US 20200131295A1
• Filed: 03/26/2019
• Published: 04/30/2020
• Est. Priority Date: 03/26/2018
• Status: Active Grant

• Current Assignee: Nippon A&L Inc. (Sumitomo Chemical Company Ltd.)
• Original Assignee: Nippon A&L Inc. (Sumitomo Chemical Company Ltd.)
• Inventors: SAITO, Takashi
• Granted Patent: US 11,845,825 B2
• Time in Patent Office: Days
• CPC Class Codes: C08F 12/08 Styrene
• CPC Class Codes: C08F 2/22 Emulsion polymerisation
• CPC Class Codes: C08F 212/08 Styrene
• CPC Class Codes: C08F 220/44 Acrylonitrile
• CPC Class Codes: C08F 255/02 on to polymers of olefins having two or three carbon atoms
• CPC Class Codes: C08F 265/06 Polymerisation of acrylate or methacrylate esters on to polymers thereof
• CPC Class Codes: C08F 279/02 on to polymers of conjugated dienes
• CPC Class Codes: C08F 279/04 Vinyl aromatic monomers and nitriles as the only monomers
• CPC Class Codes: C08F 6/22 Coagulation
• CPC Class Codes: C08J 2351/04 grafted on to rubbers
• CPC Class Codes: C08J 3/124 Treatment for improving the free-flowing characteristics
• CPC Class Codes: C08J 3/16 by coagulating dispersions C08J3/122 takes precedence
• CPC Class Codes: C08K 5/20 Carboxylic acid amides
• CPC Class Codes: C08L 51/04 grafted on to rubbers
• CPC Class Codes: C08L 55/02 ABS [Acrylonitrile-Butadiene-Styrene] polymers
• CPC Class Codes: C08L 9/06 Copolymers with styrene

Abstract

A method for manufacturing a rubber-reinforced styrenic resin powder comprising 40% by mass or more of a rubbery polymer, satisfying the following conditions (1) to (4):

(1) at least first and second coagulation baths are provided;
(2) the first and second coagulation baths are connected;
(3) an emulsified dispersion of fatty acid amide is supplied to the connecting part in an amount of 0.2 parts by mass to 2.0 parts by mass (solid content) with respect to 100 parts by mass (solid content) of a slurry; and
(4) a temperature in the second coagulation bath is equal to or higher than a temperature in the first coagulation bath.

Claims

1. A method for manufacturing a rubber-reinforced styrenic resin powder comprising 40% by mass or more of a rubbery polymer, satisfying the following conditions (1) to (4):

(1) at least first and second coagulation baths are provided;

(2) the first and second coagulation baths are connected;

(3) an emulsified dispersion of fatty acid amide is supplied to the connecting part in an amount of 0.2 parts by mass to 2.0 parts by mass (solid content) with respect to 100 parts by mass (solid content) of a slurry; and

(4) a temperature in the second coagulation bath is equal to or higher than a temperature in the first coagulation bath.

2. A rubber-reinforced styrenic resin powder comprising 40% by mass or more of a rubbery polymer, and having more than 4.0% by mass of the powder passing through a 200-mesh plain weave wire mesh (according to JIS G3555-2004) made of stainless steel wire with a wire diameter of 0.10 mm, wherein a fatty acid amide is present on 50% or more of the surface of the powder.