Elastomers with improved processability
US6376620B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 2001 |
| Grant date | Apr 23, 2002 |
| Priority date | — |
| Expiry date | Jan 8, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/16
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for improving the green strength of ethylene/&agr;-olefin/diene polymers is described comprising (A) selecting an ethylene/&agr;olefin/diene polymer having a Mooney viscosity at 125 C up to about 80 and a percent gel (% gel) up to about 30 percent and (B) partially crosslinking the ethylene/&agr;-olefin/diene polymer selected in step (A) to make a modified ethylene/&agr;-olefin/diene polymer satisfying the equations MV≦100 and wherein MV is the Mooney viscosity of the modified polymer, MS1 is the melt strength in centiNewtons of the polymer selected in step (A) at 110 C, when formulated according to ASTM D3568#2, MS2 is the melt strength in centiNewtons of the modified polymer produced by step (B) measured under the same conditions, and W is 0.3. Modified ethylene/&agr;-olefin/diene polymers obtainable according to the above process or satisfying the equation: is also described in which MS2, MV and % gel of the modified polymer are defined as defined above, X is 50, Y is 20, and Z is 40. Further described is a process for making an article comprising an ethylene/&agr;-olefin/diene polymer and intermediates for making the modified ethylene/&agr;-olefin/diene polymers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.