Bimodal block copolymer containing tapered block, process...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

Reexamination Certificate

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C525S098000, C525S271000

Reexamination Certificate

active

06849692

ABSTRACT:
The present invention relates to a bimodal linear block copolymer containing a tapered block and its manufacturing method. The bimodal linear block copolymer includes a hepta-block copolymer of vinyl aromatic block(PS1)-conjugated diene block(PB1)-tapered block(T1)-vinyl aromatic block(PS2-PS3)-conjugated diene block(PB2)-tapered block(T2)-vinyl aromatic block (PS4), and a tetra-block copolymer of vinyl aromatic block(PS3)-conjugated diene block(PB2)-tapered block(T2)-vinyl aromatic block (PS4) as prepared by adding two charges of an initiator. The bimodal linear block copolymer is prepared by adding several charges of the initiator, vinyl aromatic monomers and conjugated diene monomers to acquire transparency, toughness, rigidity and flexibility, and thereby can be used for sheets or films, or injection or blow molding products.

REFERENCES:
patent: 5130377 (1992-07-01), Trepka et al.
patent: 5227419 (1993-07-01), Moczygemba et al.
patent: 5436298 (1995-07-01), Moczygemba et al.
patent: 5438103 (1995-08-01), DePorter et al.
patent: 5587425 (1996-12-01), Moczygemba et al.
patent: 6265485 (2001-07-01), Trepka et al.
patent: 242614 (1987-10-01), None
patent: 1436812 (1976-05-01), None

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