The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 1987
Filed:
Mar. 24, 1986
Alonzo G Kitchen, Bartlesville, OK (US);
Frank J Szalla, Bartlesville, OK (US);
Phillips Petroleum Company, Bartlesville, OK (US);
Abstract
Sequential charging of initiator and monomers in a multistage solution polymerization process involving conjugated diene and monovinylaromatic 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: (S.sub.i); Stage 2: (S.sub.i); Stage 3: (B); Stage 4: (S.sub.i); Stage 5: (S+B) wherein (S.sub.i) 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 S.sub.1 -S.sub.2 -B.sub.1 -S.sub.3 -B.sub.2 .fwdarw.S.sub.4 ; S.sub.2 -B.sub.1 -S.sub.3 -B.sub.2 .fwdarw.S.sub.4 ; and S.sub.3 -B.sub.2 .fwdarw.S.sub.4 wherein S.sub.1, S.sub.2 and S.sub.3 represent, respectively, polyvinylaromatic blocks resulting from polymerization of the first, second and third charges of monovinylaromatic monomer (stages 1,2 and 4); B.sub.1 represents a polydiene block resulting from polymerization of the first charge of conjugated diene monomer (stage 3); and B.sub.2 .fwdarw.S.sub.4 represents a terminal tapered copolymer block resulting from polymerization of the conjugated diene and monovinylaromatic 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.