Poly (aminoorganofunctionaldisiloxanes)
US6353073B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 2000 |
| Grant date | Mar 5, 2002 |
| Priority date | — |
| Expiry date | Mar 22, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L83/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides near quantitative yields of greater than about 95% isomeric purity of poly(3-aminopropylmethylsiloxane)-poly(dimethylsiloxane) copolymers of the general formulae:Me3Si(H2NCH2CH2CH2MeSiO)w(Me2SiO)xOSiMe3(H2NCH2CH2CH2MeSiO)y(Me2SiO)zwherein Me is methyl, w may range from 1 to about 100, x may range from 1 to about 100, y may range from 1 to about 6, z may range from 1 to about 6 and y+z may range from 3 to about 7.The present invention also provides a simple method for rapidly producing poly(3-aminopropylmethylsiloxane)-poly(dimethylsiloxane) copolymers of the general formulae:Me3Si(H2NCH2CH2CH2MeSiO)w(Me2SiO)xOSiMe3(H2NCH2CH2CH2MeSiO)y(Me2SiO)zwherein Me is methyl, w may range from 1 to about 100, x may range from 1 to about 100, y may range from 1 to about 6, z may range from 1 to about 6, and y+z may range from 3 to about 7, the method comprising heating of poly(3-aminopropylmethylsiloxane) of at least 95% isomeric purity, a cyclodimethylsiloxane with a basic catalyst, and destroying the catalyst when the copolymerization reaction is complete.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.