Tapered block styrene/butadiene copolymers
US5227419A · kind A · utility
80Cited by
8References
44Claims
0Family size
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Key dates
| Filing date | Dec 20, 1990 |
| Grant date | Jul 13, 1993 |
| Priority date | — |
| Expiry date | Dec 20, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F297/04
- 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 first monomer to produce a polymodal tapered block copolymer. Suitable monomers include conjugated dienes and monovinylaromatic compounds. The copolymers are particularly useful for applications requiring environmental stress crack resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.