Solid elastomeric block copolymers
US5352743A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1993 |
| Grant date | Oct 4, 1994 |
| Priority date | — |
| Expiry date | Nov 1, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L53/025
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
There are disclosed novel, solid, elastomeric block copolymers with improved resistance to cold flow wherein either 1) the terminal blocks are each a polymer (I polymer) of at least one conjugated diene I, e.g., isoprene, which contains at least five carbon atoms with at least one of each pair of double-bonded carbon atoms in the polymerized diene I units being additionally single-bonded to two carbon atoms; at least one middle or interior block is a hydrogenated polybutadiene (B polymer); and at least one middle or interior block is an essentially straight chain polyethylene (E polymer) resulting from the hydrogenation of a polybutadiene composed of at least 80% of 1,4-units; or 2) the terminal blocks are random IB copolymers of at least one diene I as previously defined and hydrogenated butadiene, and at least one middle or interior block is a straight chain polyethylene (E polymer) as previously defined. The hydrogenated butadiene units in the B polymer or random IB polymer blocks are composed of no more than about 65% of 1,4-units and at least about 35% of 1,2-units. The foregoing block copolymers may be prepared by selectively hydrogenating substantially all the butadiene unit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.