Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1986-03-24
1987-11-03
Briggs, Sr., Wilbert J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
206471, 525271, 525314, C08F29704, C08F29300
Patent
active
047044349
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.
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Kitchen Alonzo G.
Szalla Frank J.
Briggs Sr. Wilbert J.
Phillips Petroleum Company
Woodrow Hal Brent
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