Making impact resistant polymers

US4308354A · kind A · utility

Assignee

• Rohm Co., Ltd. · JP

Inventors

• Karl A. Jung · Ober-Ramstadt, DE
• Manfred Munzer · Bensheim, DE
• Heinz Vetter · Weiterstadt, DE
• Winfried Wunderlich · Roßdorf, DE

Key dates

• Filing date: Jan 19, 1981
• Grant date: Dec 29, 1981
• Expiry date: Jan 19, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F279/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

What is disclosed are a method for making a transparent impact-resistant polymer comprising a rubbery phase of grafted polybutadiene and a hard copolymer phase, which polymer is adaptable to use as a molding material, which method comprises: PA1 (1) in a first polymerization stage, dissolving a solid polybutadiene rubber in a monomer mixture comprising (a) methyl methacrylate, (b) styrene, and (c) at least one of methyl acrylate or ethyl acrylate to give a solution containing from 3 to 10 percent by weight of said rubber, and then polymerizing the solution using an initiator promoting graft copolymerization and in the presence ab initio of a chain transfer agent until an amount of said monomer mixture which is one to two times the weight of said polybutadiene rubber introduced is converted, said monomers (a), (b), and (c) being present in said monomer mixture in a ratio by weight of (73.+-.5): (22.+-.2); (5.+-.3) such that the index of refraction of the hard polymer phase produced by the polymerization is equal to that of said polybutadiene, and said initiator being one forming tertiary-butoxy or phenyl free-radicals on decomposition; PA1 (2) in a second stage, further polymerizing…