C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/2047
C08F 297/04 (2006.01)
Patent
CA 1257029
ABSTRACT Sequential charging of initiator and monomers in a multistage solution polymerization process involving conjugated diene and monovinyl- aromatic monomers wherein the final charge is a mixture of these monomers results in the production of resinous polymodal linear block copolymers each with a terminal tapered block. A typical 5-stage charge sequence is as follows: Stage 1: (Si); Stage 2: (Si); Stage 3: (B); Stage 4: (Si); Stage 5: (S+B) wherein (Si) is monovinylaromatic monomer and initiator; (B) is conjugated diene monomer and (S+B) is monovinylaromatic monomer and conjugated diene monomer. At each stage, polymerization is allowed to continue until no free monomer is present. The trimodal block copolymer products comprise high, medium and low molecular weight species designated, respectively, as S1-S2-B1-S3-B2?S4; S2-B-S3-B2?S4; and S3-B2?S4 wherein S1, S2 and S3 represent, respectively, polyvinylaromatic blocks resulting from polymer- ization of the first, second and third charges of monovinylaromatic monomer (stages 1,2 and 4); B1 represents a polydiene block resulting from polymerization of the first charge of conjugated diene monomer (stage 3); and B2?S4 represents a terminal tapered copolymer block resulting from polymerization of the conjugated diene and monovinyl- aromatic monomers (stage 5). The subject copolymers can be fabricated into sheets and molded objects possessing little color, a high degree of transparency and excellent impact resistance. These fabricated products do not craze on being impacted.
524395
Kitchen Alonzo G.
Szalla Frank J.
Osler Hoskin & Harcourt Llp
Phillips Petroleum Company
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