Method to control increase in viscosity during aging of siloxane modified polymers
US6255404A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1999 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Jul 26, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/13
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for controlling any increase in Mooney viscosity during aging of siloxane-functionalized polymers includes the step of adding a viscosity stabilizing effective amount of a viscosity stabilizing agent selected from the group consisting of alkyl alkoxysilanes of the structural formula EQU R.sup.1.sub.n Si(OR.sup.2).sub.4-n wherein R.sup.1 is selected from the group consisting of C.sub.1 to C.sub.20 alkyl, C.sub.4 to C.sub.10 cycloalkyl, or C.sub.5 to C.sub.20 aromatic groups, wherein R.sup.2 may be the same as or different from R.sup.1 and is selected from the group consisting of C.sub.1 to C.sub.20 alkyl, C.sub.4 to C.sub.10 cycloalkyl, or C.sub.5 to C.sub.20 aromatic groups, and wherein n is an integer from 1 to 3. The method provides for the stabilization of Mooney viscosity of siloxane-functionalized polymers at any given level upon aging. The viscosity stabilizing agents react with the siloxane-functionalized polymers during hydrolysis of the siloxane end groups to form moisture stabilized polymers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.