Aliphatic silylated polyurethane mixtures having reduced viscosites
US5539045A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 1995 |
| Grant date | Jul 23, 1996 |
| Priority date | — |
| Expiry date | Oct 27, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2190/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A silylated polyurethane made by the reaction of an isocyanate-terminated polyurethane a mixture of a first and a second alkoxysilane, each of which has the general formula: EQU (CH.sub.3).sub.m (CH.sub.3 O).sub.3-m Si(CH.sub.2).sub.3 XH PA1 wherein X is NR, S, oxygen, or a ureido radical, and R is PA1 hydrogen, alkyl, aryl, aminoalkyl or trimethoxysilylpropyl, has a lower viscosity than the average of the viscosities of two polyurethanes made from the same isocyanate-terminated polyurethane and either the first alkoxysilane or the second alkoxysilane. Likewise, a blend of those two silylated polyurethanes has a lower viscosity than the viscosity anticipated by the linear viscosity relationship typically observed for blends. Said linear relationship is based on a calculation of the weighted average viscosity of the blend from the viscosity of each component and the proportion of each.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.