Aliphatic polycarbonate-triols and modified aminoplast resins derived therefrom
US4201720A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1977 |
| Grant date | May 6, 1980 |
| Priority date | — |
| Expiry date | Nov 22, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31507
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Aliphatic or cycloaliphatic polycarbonate-triols having a molecular weight of not more than 3,000, which contain hydrophobic segments and are liquid at room temperature are obtained by transesterifying an aryl carbonate with a primary aliphatic triol and a mixture of two diols, HOAOH and HOBOH, at least one of the radicals A or B being a hydrophobic radical, the proportion of the primary aliphatic triol is such that there is statistically one molecule of the said triol per polymer chain in the product, and the ratio of the diols being such that the polycarbonate-triol obtained is equivalent to a mixture of a% by weight of a polycarbonate derived from the triol and the diol HOAOH alone, and of b% by weight of a polycarbonate derived from the triol and the diol HOBOH alone, the percentages a and b corresponding to the following two conditions: EQU 30%.ltoreq.a%.ltoreq.70% EQU a%+b%=100%. Modified aminoplast resins can be obtained by reacting such polycarbonate-triols with etherified melamine-formaldehyde condensates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.