High viscosity polyoxyalkylene glycol block copolymers and method of making the same
US4481367A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 22, 1983 |
| Grant date | Nov 6, 1984 |
| Priority date | — |
| Expiry date | Nov 22, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/08
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A high molecular weight, high viscosity liquid, water soluble polyoxyalkylene block copolymer suitable as a functional fluid is provided having the formula ##STR1## wherein Q is the organic residue from an organic diisocyanate; x is an integer in the range of about 1 to 10; R.sup.1 and R.sup.2 are hydrogen, methyl, ethyl, or mixtures thereof with the proviso that the overall content of species wherein R.sup.1 and R.sup.2 are hydrogen must be at least 50 percent by weight; R.sup.3 and R.sup.4 are organic residues resulting from the removal of terminal hydrogen atoms from difunctional polyols; y and z are integers representing the polyether blocks in said copolymer and the sum of which must be from about 1.05 to 2.0 times the value of x; and n, m, r, and s are integers wherein n=m and r=s and the sums n+m and r+s are each in the range of 8 to 250.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.