Tapered block styrene/butadiene copolymers
US5130377A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1991 |
| Grant date | Jul 14, 1992 |
| Priority date | — |
| Expiry date | Feb 6, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2325/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for preparing tapered block copolymers in a polymerization process by charging an initiator and monomers sequentially with one or more charges of first one of the monomers, then with a mixture of the two monomers, and then with one or more charges of the second monomer alternating with one or more charges of the first monomer with subsequent coupling, to produce a polymodal tapered block copolymer. Suitable monomers include conjugated dienes and monovinylaromatic compounds. The copolymers are suitable for use in injection and blow molding equipment; the copolymers are particularly useful for shrink films, containers, tubes, fibers and other packaging applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.