Polyurethane and its use in aqueous painting plastic
US6750286B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2001 |
| Grant date | Jun 15, 2004 |
| Priority date | — |
| Expiry date | Jun 26, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31551
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polyurethane which has a number average molecular weight Mn of from 3,000 to 50,000 and an acid number of from 10 to 35 and is preparable by reacting(a1) at least one polyesterpolyol having a number average molecular weight Mn of from 1,000 to 4,000, an acid number of from 0 to 15, and an OH number of from 35 to 150, based on acyclic aliphatic and cycloaliphatic dicarboxylic acids,(a2) a mixture of at least one diol and one triol,(a3) at least one compound containing at least two isocyanate-reactive functional groups and at least one functional group capable of forming anions, and(a4) a mixture of at least one, acyclic aliphatic and at least one cycloaliphatic diisocyanate,to give an isocyanato-containing prepolymer that is then chain extended with a polyfunctional amine or amino alcohol and, if desired, is neutralized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.