Hydrogenated block copolymer and polypropylene resin composition containing the same
US6310138A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2000 |
| Grant date | Oct 30, 2001 |
| Priority date | — |
| Expiry date | Apr 5, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/035
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A hydrogenated block copolymer comprising: two polymer blocks A mainly comprising vinylaromatic hydrocarbon compound monomer units; and one hydrogenated polymer block B mainly comprising butadiene monomer units, in which at least 90% of olefinically unsaturated double bonds contained in a polymer block mainly comprising butadiene monomer units before hydrogenation have been hydrogenated, wherein a bonding vinylaromatic hydrocarbon compound content in the hydrogenated block copolymer is higher than 13 wt % but lower than 25 wt %, a 1,2-bond content in the unhydrogenated polymer block mainly comprising butadiene monomer units is higher than 40 mol % but lower than 60 mol %, and the copolymer has a quantity of heat of crystal fusion (.DELTA.H) smaller than 0.05 J/g, an order-disorder transition temperature of 200.degree. C. or higher, and a melt flow rate (MFR) value, as determined in accordance with JIS K7210 under the conditions of a temperature of 230.degree. C. and a load of 2.16 kg, of from not smaller than 0.1 g/10 min to smaller than 30 g/10 min. By incorporating the copolymer into a polypropylene resin, a composition which is suitable for giving a molded article having an exce…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.